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Sugi H, Ohno T, Moriya M. Mechanism and Function of the Catch State in Molluscan Smooth Muscle: A Historical Perspective. Int J Mol Sci 2020; 21:ijms21207576. [PMID: 33066438 PMCID: PMC7589332 DOI: 10.3390/ijms21207576] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 09/30/2020] [Accepted: 10/02/2020] [Indexed: 11/25/2022] Open
Abstract
Molluscan smooth muscles exhibit the catch state, in which both tension and resistance to stretch are maintained with very low rates of energy consumption. The catch state is studied mainly on the anterior byssus retractor muscle (ABRM) of a bivalve molluscan animal, Mytilus, which can easily be split into small bundles consisting of parallel fibers. The ABRM contracts actively with an increase in the intracellular free Ca ion concentration, [Ca2+]i, as with all other types of muscle. Meanwhile, the catch state is established after the reduction of [Ca2+]i to the resting level. Despite extensive studies, the mechanism underlying the catch state is not yet fully understood. This article briefly deals with (1) anatomical and ultrastructural aspects of the ABRM, (2) mechanical studies on the transition from the active to the catch state in the isotonic condition, (3) electron microscopic and histochemical studies on the intracellular translocation of Ca ions during the transition from the active to the catch state, and (4) biochemical studies on the catch state, with special reference to a high molecular mass protein, twitchin, which is known to occur in molluscan catch muscles.
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Affiliation(s)
- Haruo Sugi
- Department of Physiology, Teikyo University School of Medicine, Tokyo 173-8605, Japan
- Correspondence: ; Tel.: +81-484-784079
| | - Tetsuo Ohno
- Department of Sports Medicine, Teikyo Heisei University, Chibaken 290-0193, Japan; (T.O.); (M.M.)
| | - Masamichi Moriya
- Department of Sports Medicine, Teikyo Heisei University, Chibaken 290-0193, Japan; (T.O.); (M.M.)
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Scalable, Non-denaturing Purification of Phosphoproteins Using Ga 3+-IMAC: N2A and M1M2 Titin Components as Study case. Protein J 2019; 38:181-189. [PMID: 30719619 DOI: 10.1007/s10930-019-09815-w] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The purification of phosphorylated proteins in a folded state and in large enough quantity for biochemical or biophysical analysis remains a challenging task. Here, we develop a new implementation of the method of gallium immobilized metal chromatography (Ga3+-IMAC) as to permit the selective enrichment of phosphoproteins in the milligram scale and under native conditions using automated FPLC instrumentation. We apply this method to the purification of the UN2A and M1M2 components of the muscle protein titin upon being monophosphorylated in vitro by cAMP-dependent protein kinase (PKA). We found that UN2A is phosphorylated by PKA at its C-terminus in residue S9578 and M1M2 is phosphorylated in its interdomain linker sequence at position T32607. We demonstrate that the Ga3+-IMAC method is efficient, economical and suitable for implementation in automated purification pipelines for recombinant proteins. The procedure can be applied both to the selective enrichment and to the removal of phosphoproteins from biochemical samples.
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Matusovsky OS, Shevchenko UV, Matusovskaya GG, Sobieszek A, Dobrzhanskaya AV, Shelud’ko NS. Catch muscle myorod modulates ATPase activity of Myosin in a phosphorylation-dependent way. PLoS One 2015; 10:e0125379. [PMID: 25915932 PMCID: PMC4410989 DOI: 10.1371/journal.pone.0125379] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 03/23/2015] [Indexed: 11/18/2022] Open
Abstract
Myorod is expressed exclusively in molluscan catch muscle and localizes on the surface of thick filaments together with twitchin and myosin. Myorod is an alternatively spliced product of the myosin heavy-chain gene that contains the C-terminal rod part of myosin and a unique N-terminal domain. The unique domain is a target for phosphorylation by gizzard smooth myosin light chain kinase (smMLCK) and, perhaps, molluscan twitchin, which contains a MLCK-like domain. To elucidate the role of myorod and its phosphorylation in the catch muscle, the effect of chromatographically purified myorod on the actin-activated Mg2+-ATPase activity of myosin was studied. We found that phosphorylation at the N-terminus of myorod potentiated the actin-activated Mg2+-ATPase activity of mussel and rabbit myosins. This potentiation occurred only if myorod was phosphorylated and introduced into the ATPase assay as a co-filament with myosin. We suggest that myorod could be related to the catch state, a function specific to molluscan muscle.
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Affiliation(s)
- Oleg S. Matusovsky
- A.V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia
- School of Biomedicine, Far Eastern Federal University, Vladivostok, Russia
- * E-mail: (OM); (NS)
| | - Ulyana V. Shevchenko
- A.V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia
| | - Galina G. Matusovskaya
- A.V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia
| | - Apolinary Sobieszek
- Institute for Biomedical Aging Research, Austrian Academy of Sciences, Innsbruck, Austria
| | - Anna V. Dobrzhanskaya
- A.V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia
| | - Nikolay S. Shelud’ko
- A.V. Zhirmunsky Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russia
- * E-mail: (OM); (NS)
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Funabara D, Watanabe D, Satoh N, Kanoh S. Genome-Wide Survey of Genes Encoding Muscle Proteins in the Pearl Oyster,Pinctada fucata. Zoolog Sci 2013; 30:817-25. [DOI: 10.2108/zsj.30.817] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Molluscan catch muscle myorod and its N-terminal peptide bind to F-actin and myosin in a phosphorylation-dependent manner. Arch Biochem Biophys 2011; 509:59-65. [DOI: 10.1016/j.abb.2011.02.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 02/12/2011] [Accepted: 02/12/2011] [Indexed: 12/18/2022]
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A force-activated kinase in a catch smooth muscle. J Muscle Res Cell Motil 2011; 31:349-58. [PMID: 21286791 DOI: 10.1007/s10974-011-9240-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Accepted: 01/18/2011] [Indexed: 10/18/2022]
Abstract
Permeabilized anterior byssus retractor muscles (ABRM) from Mytilus edulis were used as a simple system to test whether there is a stretch dependent activation of a kinase as has been postulated for titin and the mini-titin twitchin. The ABRM is a smooth muscle that shows catch, a condition of high force maintenance and resistance to stretch following stimulation when the intracellular Ca(++) concentration has diminished to sub-maximum levels. In the catch state twitchin is unphosphorylated, and the muscle maintains force without myosin crossbridge cycling through what is likely a twitchin mediated tether between thick and thin filaments. In catch, a small change in length results in a large change in force. The phosphorylation state of an added peptide, a good substrate for molluscan twitchin kinase, with the sequence KKRAARATSNVFA was used as a measure of kinase activation. We find that there is about a two-fold increase in phosphorylation of the added peptide with a 10% stretch of the ABRM in catch. The increased phosphorylation is due to activation of a kinase rather than to an inhibition of a phosphatase. The extent of phosphorylation of the peptide is decreased when twitchin is phosphorylated and catch force is not present. However, there is also a large increase in peptide phosphorylation when the muscle is activated in pCa 5, and the catch state does not exist. The force-sensitive kinase activity is decreased by ML-9 and ML-7 which are inhibitors of twitchin kinase, but not by the Rho kinase inhibitor Y-27632. There is no detectable phosphorylation of myosin light chains, but the phosphorylation of twitchin increases by a small, but significant extent with stretch. It is possible that twitchin senses force output resulting in a force-sensitive twitchin kinase activity that results in autophosphorylation of twitchin on site(s) other than those responsible for relaxation of catch.
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Butler TM, Mooers SU, Narayan SR, Siegman MJ. The N-terminal region of twitchin binds thick and thin contractile filaments: redundant mechanisms of catch force maintenance. J Biol Chem 2010; 285:40654-65. [PMID: 20971853 DOI: 10.1074/jbc.m110.166041] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Catch force maintenance in invertebrate smooth muscles is probably mediated by a force-bearing tether other than myosin cross-bridges between thick and thin filaments. The phosphorylation state of the mini-titin twitchin controls catch. The C-terminal phosphorylation site (D2) of twitchin with its flanking Ig domains forms a phosphorylation-sensitive complex with actin and myosin, suggesting that twitchin is the tether (Funabara, D., Osawa, R., Ueda, M., Kanoh, S., Hartshorne, D. J., and Watabe, S. (2009) J. Biol. Chem. 284, 18015-18020). Here we show that a region near the N terminus of twitchin also interacts with thick and thin filaments from Mytilus anterior byssus retractor muscles. Both a recombinant protein, including the D1 and DX phosphorylation sites with flanking 7th and 8th Ig domains, and a protein containing just the linker region bind to thin filaments with about a 1:1 mol ratio to actin and K(d) values of 1 and 15 μM, respectively. Both proteins show a decrease in binding when phosphorylated. The unphosphorylated proteins increase force in partially activated permeabilized muscles, suggesting that they are sufficient to tether thick and thin filaments. There are two sites of thin filament interaction in this region because both a 52-residue peptide surrounding the DX site and a 47-residue peptide surrounding the D1 site show phosphorylation-dependent binding to thin filaments. The peptides relax catch force, confirming the region's central role in the mechanism of catch. The multiple sites of thin filament interaction in the N terminus of twitchin in addition to those in the C terminus provide an especially secure and redundant mechanical link between thick and thin filaments in catch.
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Affiliation(s)
- Thomas M Butler
- Department of Molecular Physiology and Biophysics, Jefferson Medical College, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.
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GALINDO J, GRAHAME JW, BUTLIN RK. An EST-based genome scan using 454 sequencing in the marine snail Littorina saxatilis. J Evol Biol 2010; 23:2004-16. [DOI: 10.1111/j.1420-9101.2010.02071.x] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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9
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Fabbri E, Capuzzo A. Cyclic AMP signaling in bivalve molluscs: an overview. ACTA ACUST UNITED AC 2010; 313:179-200. [PMID: 20127660 DOI: 10.1002/jez.592] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The cyclic AMP (cAMP)-dependent signaling accounts for the control of cellular cascades involved in many physiological functions, and a wealth of information is available on the cAMP system that operates in mammalian cells. Nevertheless, cAMP has a central role also in nonmammalian vertebrates and invertebrates. The present review aims at examining the information available on bivalve molluscs, from the first studies carried out in the early 1980s to the last progresses made in the present days. The major focus is on the structural and operational characteristics of the main actors of the signaling pathway, i.e., adenylyl cyclase, G proteins, and protein kinase A, and on the role played by the cyclic nucleotide on smooth muscle, heart, gills, gonads, and metabolism regulation. Moreover, recent evidence regarding the cAMP system as a target of environmental stress factors are discussed. It will become clear that cAMP does play a wide and important role in bivalve physiology. Several issues have been sufficiently clarified, although investigated only in a few model species. However, further fundamental aspects remain unknown, mainly regarding molecular features and interactions with other signaling pathways, thus requiring further elucidation.
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Affiliation(s)
- Elena Fabbri
- Interdepartment Centre for Research in Environmental Sciences (CIRSA), University of Bologna, Ravenna, Italy.
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Matusovsky OS, Shelud'ko NS, Permyakova TV, Zukowska M, Sobieszek A. Catch muscle of bivalve molluscs contains myosin- and twitchin-associated protein kinase phosphorylating myorod. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2010; 1804:884-90. [DOI: 10.1016/j.bbapap.2009.12.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2009] [Revised: 11/11/2009] [Accepted: 12/28/2009] [Indexed: 10/20/2022]
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Bardales JR, Díaz-Enrich MJ, Villamarín A. Differential distribution of cAMP-dependent protein kinase isoforms in the mantle of the bivalve mollusc Mytilus galloprovincialis. J Mol Histol 2009; 40:251-9. [DOI: 10.1007/s10735-009-9236-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2009] [Accepted: 10/25/2009] [Indexed: 10/20/2022]
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Funabara D, Osawa R, Ueda M, Kanoh S, Hartshorne DJ, Watabe S. Myosin loop 2 is involved in the formation of a trimeric complex of twitchin, actin, and myosin. J Biol Chem 2009; 284:18015-20. [PMID: 19439402 DOI: 10.1074/jbc.m109.016485] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Molluscan smooth muscles exhibit a low energy cost contraction called catch. Catch is regulated by twitchin phosphorylation and dephosphorylation. Recently, we found that the D2 fragment of twitchin containing the D2 site (Ser-4316) and flanking immunoglobulin motifs (TWD2-S) formed a heterotrimeric complex with myosin and with actin in the region that interacts with myosin loop 2 (Funabara, D., Hamamoto, C., Yamamoto, K., Inoue, A., Ueda, M., Osawa, R., Kanoh, S., Hartshorne, D. J., Suzuki, S., and Watabe, S. (2007) J. Exp. Biol. 210, 4399-4410). Here, we show that TWD2-S interacts directly with myosin loop 2 in a phosphorylation-sensitive manner. A synthesized peptide, CAQNKEAETTGTHKKRKSSA, based on the myosin loop 2 sequence (loop 2 peptide), competitively inhibited the formation of the trimeric complex. Isothermal titration calorimetry showed that TWD2-S binds to the loop 2 peptide with a K(a) of (2.44 +/- 0.09) x 10(5) m(-1) with two binding sites. The twitchin-binding peptide of actin, AGFAGDDAP, which also inhibited formation of the trimeric complex, bound to TWD2-S with a K(a) of (5.83 +/- 0.05) x 10(4) m(-1) with two binding sites. The affinity of TWD2-S to actin and myosin was slightly decreased with an increase of pH, but this effect could not account for the marked pH dependence of catch in permeabilized fibers. The complex formation also showed a moderate Ca(2+) sensitivity in that in the presence of Ca(2+) complex formation was reduced.
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Affiliation(s)
- Daisuke Funabara
- Graduate School of Bioresources, Mie University, Tsu, Mie 514-8507, Japan
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Galler S. Molecular basis of the catch state in molluscan smooth muscles: a catchy challenge. J Muscle Res Cell Motil 2008; 29:73-99. [PMID: 19039672 DOI: 10.1007/s10974-008-9149-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2008] [Accepted: 10/18/2008] [Indexed: 12/15/2022]
Abstract
The catch state (or 'catch') of molluscan smooth muscles is a passive holding state that occurs after cessation of stimulation. During catch, force and, in particular, resistance to stretch are maintained for long time periods with low (or no) energy consumption at basal intracellular free [Ca2+]. The catch state is initiated by Ca2+-stimulated dephosphorylation of the titin-like protein twitchin and is inhibited by cAMP-dependent phosphorylation of twitchin. In addition, catch is pH sensitive, but the reason for this is unknown. According to a traditional model, catch is due to slower cross-bridge cycles where myosin heads remain longer attached to the actin filaments after force generation, possibly caused by a hindered release of ADP from the myosin heads. However, this model was disproved by recent findings which showed that (i) inhibitors of myosin function, such as vanadate, do not affect catch force; (ii) factors which terminate the catch state do not accelerate myosin head detachment kinetics and (iii) a catch-like high resistance to stretch is still inducible when force development is prevented. Thus, catch probably involves passive linkage structures interconnecting the myofilaments (catch linkages). For example twitchin could (i) tie myosin heads to the thin filaments, (ii) mechanically lock them in a stretch resistant state or (iii) interconnect thick and thin filaments directly. However, it is questionable if these mechanisms are sufficient since twitchin seems to be about 15-times less abundant than myosin. Therefore, in addition, interconnections between thick filaments could exist, which could involve e.g. paramyosin or twitchin. Catch could even involve changes in the compliance of thick filaments. The function of myorod, found specifically in catch muscles in equal abundance with myosin, is not known. The suggestion is made here that catch linkages are present already during active contraction either as ratchet-like elements resisting stretch and not opposing shortening or in some kind of 'standby' mode ready to transform suddenly into the working mode by stretches or after Ca2+ removal following cessation of stimulation.
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Affiliation(s)
- Stefan Galler
- Department of Cell Biology, University of Salzburg, Hellbrunnerstrasse 34, 5020, Salzburg, Austria.
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Hooper SL, Hobbs KH, Thuma JB. Invertebrate muscles: thin and thick filament structure; molecular basis of contraction and its regulation, catch and asynchronous muscle. Prog Neurobiol 2008; 86:72-127. [PMID: 18616971 PMCID: PMC2650078 DOI: 10.1016/j.pneurobio.2008.06.004] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2007] [Revised: 05/08/2008] [Accepted: 06/12/2008] [Indexed: 11/26/2022]
Abstract
This is the second in a series of canonical reviews on invertebrate muscle. We cover here thin and thick filament structure, the molecular basis of force generation and its regulation, and two special properties of some invertebrate muscle, catch and asynchronous muscle. Invertebrate thin filaments resemble vertebrate thin filaments, although helix structure and tropomyosin arrangement show small differences. Invertebrate thick filaments, alternatively, are very different from vertebrate striated thick filaments and show great variation within invertebrates. Part of this diversity stems from variation in paramyosin content, which is greatly increased in very large diameter invertebrate thick filaments. Other of it arises from relatively small changes in filament backbone structure, which results in filaments with grossly similar myosin head placements (rotating crowns of heads every 14.5 nm) but large changes in detail (distances between heads in azimuthal registration varying from three to thousands of crowns). The lever arm basis of force generation is common to both vertebrates and invertebrates, and in some invertebrates this process is understood on the near atomic level. Invertebrate actomyosin is both thin (tropomyosin:troponin) and thick (primarily via direct Ca(++) binding to myosin) filament regulated, and most invertebrate muscles are dually regulated. These mechanisms are well understood on the molecular level, but the behavioral utility of dual regulation is less so. The phosphorylation state of the thick filament associated giant protein, twitchin, has been recently shown to be the molecular basis of catch. The molecular basis of the stretch activation underlying asynchronous muscle activity, however, remains unresolved.
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Affiliation(s)
- Scott L. Hooper
- Neuroscience Program Department of Biological Sciences Ohio University Athens, OH 45701 614 593-0679 (voice) 614 593-0687 (FAX)
| | - Kevin H. Hobbs
- Neuroscience Program Department of Biological Sciences Ohio University Athens, OH 45701 614 593-0679 (voice) 614 593-0687 (FAX)
| | - Jeffrey B. Thuma
- Neuroscience Program Department of Biological Sciences Ohio University Athens, OH 45701 614 593-0679 (voice) 614 593-0687 (FAX)
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Li HL, Song LS, Qian PY. Cyclic AMP concentration and protein kinase A (PKA) gene expression at different developmental stages of the polychaete Hydroides elegans. JOURNAL OF EXPERIMENTAL ZOOLOGY PART B-MOLECULAR AND DEVELOPMENTAL EVOLUTION 2008; 310:417-27. [PMID: 18335538 DOI: 10.1002/jez.b.21214] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine (IBMX) showed inductive effect on larval settlement of the polychaete Hydroides elegans. It has been suggested that IBMX triggers larval settlement by elevating the cellular adenosine 3',5'-cyclic monophosphate (cAMP) level in this species. To test this hypothesis, we first examined cAMP-level changes in both the competent (CL) and attached larvae (AL) and then characterized the cAMP-dependent protein kinase in H. elegans, which is the major mediator of cAMP action. Tissue extracts of the larvae were assayed for cAMP by enzyme immunoassay; the results showed that IBMX increased cAMP production up to approximately two-folds in the CL. However, there was no significant difference in the cAMP concentration between the CL and AL that were not treated with IBMX. The catalytic subunit of protein kinase A gene from H. elegans (designated HePKAc) was cloned, and its expression in different developmental stages of H. elegans was examined using quantitative real-time polymerase chain reaction. The gene expression level in the pre-competent trochophore larvae was the lowest, increased in the CL, reached the highest in the larvae undergoing normal and IBMX-induced metamorphosis, and then decreased in the adult stage. In situ hybridization results showed that HePKAc expressed mainly around eye regions and along body fragments of the CL and AL. Our results indicated that the IBMX-induced cAMP changes and the cAMP-dependent protein kinase gene may mediate larval development and settlement of H. elegans.
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Affiliation(s)
- Hong-Lei Li
- Atmospheric, Marine, and Coastal Environment Program and Coastal Marine Laboratory, Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, People's Republic of China
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Kusaka M, Ikeda D, Funabara D, Hartshorne DJ, Watabe S. The occurrence of tissue-specific twitchin isoforms in the mussel Mytilus galloprovincialis. FISHERIES SCIENCE : FS 2008; 74:677-686. [PMID: 19777122 PMCID: PMC2748407 DOI: 10.1111/j.1444-2906.2008.01574.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The catch state in Mytilus anterior byssus retractor muscle is regulated by phosphorylation and dephosphorylation of twitchin, a member of the titin/connectin superfamily, and involves two serine residues, Ser-1075 (D1) and Ser-4316 (D2). This study was undertaken to examine whether isoforms of twitchin were expressed in various muscles of the mussel Mytilus galloprovincialis by reverse transcription-polymerase chain reaction. Mussel tissues, including both catch and non-catch muscles, contained various twitchin isoforms that all contained the D2 site and the kinase domain. However, sequence alterations were detected around the D1 site, notably a potential deletion of the D1 site. All isoforms from catch muscles contained both the D1 and D2 sites, whereas those from non-catch muscles also expressed the D2 site, but some of them lacked the D1 site. This suggests that the D1 site of twitchin is essential to the mechanism of catch. Genomic DNA analysis revealed that twitchin isoforms are produced by alternative splicing.
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Affiliation(s)
- Miho Kusaka
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657
| | - Daisuke Ikeda
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657
| | - Daisuke Funabara
- Laboratory of Muscle Biology, Graduate School of Bioresources, Mie University, Tsu, Mie 514-8507, Japan
| | | | - Shugo Watabe
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657
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Funabara D, Hamamoto C, Yamamoto K, Inoue A, Ueda M, Osawa R, Kanoh S, Hartshorne DJ, Suzuki S, Watabe S. Unphosphorylated twitchin forms a complex with actin and myosin that may contribute to tension maintenance in catch. ACTA ACUST UNITED AC 2008; 210:4399-410. [PMID: 18055628 DOI: 10.1242/jeb.008722] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Molluscan smooth muscle can maintain tension over extended periods with little energy expenditure, a process termed catch. Catch is thought to be regulated by phosphorylation of a thick filament protein, twitchin, and involves two phosphorylation sites, D1 and D2, close to the N and C termini, respectively. This study was initiated to investigate the role of the D2 site and its phosphorylation in the catch mechanism. A peptide was constructed containing the D2 site and flanking immunoglobulin (Ig) motifs. It was shown that the dephosphorylated peptide, but not the phosphorylated form, bound to both actin and myosin. The binding site on actin was within the sequence L10 to P29. This region also binds to loop 2 of the myosin head. The dephosphorylated peptide linked myosin and F-actin and formed a trimeric complex. Electron microscopy revealed that twitchin is distributed on the surface of the thick filament with an axial periodicity of 36.25 nm and it is suggested that the D2 site aligns with the myosin heads. It is proposed that the complex formed with the dephosphorylated D2 site of twitchin, F-actin and myosin represents a component of the mechanical linkage in catch.
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Affiliation(s)
- Daisuke Funabara
- Graduate School of Bioresources, Mie University, Tsu, Mie 514-8507, Japan
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Shelud'ko NS, Matusovsky OS, Permyakova TV, Matusovskaya GG. "Twitchin-actin linkage hypothesis" for the catch mechanism in molluscan muscles: evidence that twitchin interacts with myosin, myorod, and paramyosin core and affects properties of actomyosin. Arch Biochem Biophys 2007; 466:125-35. [PMID: 17720132 DOI: 10.1016/j.abb.2007.07.014] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2007] [Revised: 07/11/2007] [Accepted: 07/13/2007] [Indexed: 10/23/2022]
Abstract
"Twitchin-actin linkage hypothesis" for the catch mechanism in molluscan smooth muscles postulates in vivo existence of twitchin links between thin and thick filaments that arise in a phosphorylation-dependent manner [N.S. Shelud'ko, G.G. Matusovskaya, T.V. Permyakova, O.S. Matusovsky, Arch. Biochem. Biophys. 432 (2004) 269-277]. In this paper, we proposed a scheme for a possible catch mechanism involving twitchin links and regulated thin filaments. The experimental evidence in support of the scheme is provided. It was found that twitchin can interact not only with mussel myosin and rabbit F-actin but also with the paramyosin core of thick filaments, myorod, mussel thin filaments, "natural" F-actin from mussel, and skeletal myosin from rabbit. No difference was revealed in binding of twitchin with mussel and rabbit myosin. The capability of twitchin to interact with all thick filament proteins suggests that putative twitchin links can be attached to any site of thick filaments. Addition of twitchin to a mixture of actin and paramyosin filaments, or to a mixture of Ca(2+)-regulated actin and myosin filaments under relaxing conditions caused in both cases similar changes in the optical properties of suspensions, indicating an interaction and aggregation of the filaments. The interaction of actin and myosin filaments in the presence of twitchin under relaxing conditions was not accompanied by an appreciable increase in the MgATPase activity. We suggest that in both cases aggregation of filaments was caused by formation of twitchin links between the filaments. We also demonstrate that native thin filaments from the catch muscle of the mussel Crenomytilus grayanus are Ca(2+)-regulated. Twitchin inhibits the ability of thin filaments to activate myosin MgATPase in the presence of Ca(2+). We suggest that twitchin inhibition of the actin-myosin interaction is due to twitchin-induced switching of the thin filaments to the inactive state.
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Affiliation(s)
- Nikolay S Shelud'ko
- Department of Cell Biophysics, Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok 690041, Russia.
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Tsutsui Y, Yoshio M, Oiwa K, Yamada A. Twitchin purified from molluscan catch muscles regulates interactions between actin and myosin filaments at rest in a phosphorylation-dependent manner. J Muscle Res Cell Motil 2007; 26:461-5. [PMID: 16453160 DOI: 10.1007/s10974-005-9030-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Twitchin, also called mini-titin, is structurally related to the giant elastic protein connectin/titin, and has been found in not only striated but also smooth muscles of bivalves. Many bivalve smooth muscles such as byssus retractor muscles and the opaque part of adductor muscles are known as catch muscles that can maintain high passive tension with little expenditure of energy after they have actively contracted. Twitchin is phosphorylated when this high-tension state (catch state) ceases. Our recent studies revealed that the catch tension is due to interactions between thick and thin filaments in the presence of MgATP at low free Ca2+ concentrations, which can be visualized in vitro under a light microscope (Yamada et al., 2001 Proc Natl Acad Sci USA 98: 6635-6640). We also found that twitchin is essential for the interactions of the catch state in mussel (Mytilus galloprovincialis) catch muscles. In the presence of twitchin, actin filaments bound to purified myosin filaments when twitchin was dephosphorylated by Ser/Thr protein phosphatase 2B, while they did not when it was phosphorylated by cAMP-dependent protein kinase. In the current study we demonstrate the same essential components of the catch state for another bivalve that exhibits catch, i.e., Japanese oyster (Crassostrea gigas).
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Affiliation(s)
- Yasutaka Tsutsui
- Graduate School of Life Science, University of Hyogo, Kouto 3-2-1, Kamigori, Ako-gun, Hyogo, 678-1297, Japan
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20
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Funabara D, Kanoh S, Siegman MJ, Butler TM, Hartshorne DJ, Watabe S. Twitchin as a regulator of catch contraction in molluscan smooth muscle. J Muscle Res Cell Motil 2007; 26:455-60. [PMID: 16453161 PMCID: PMC1483069 DOI: 10.1007/s10974-005-9029-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Molluscan catch muscle can maintain tension for a long time with little energy consumption. This unique phenomenon is regulated by phosphorylation and dephosphorylation of twitchin, a member of the titin/connectin family. The catch state is induced by a decrease of intracellular Ca2+ after the active contraction and is terminated by the phosphorylation of twitchin by the cAMP-dependent protein kinase (PKA). Twitchin, from the well-known catch muscle, the anterior byssus retractor muscle (ABRM) of the mollusc Mytilus, incorporates three phosphates into two major sites D1 and D2, and some minor sites. Dephosphorylation is required for re-entering the catch state. Myosin, actin and twitchin are essential players in the mechanism responsible for catch during which force is maintained while myosin cross-bridge cycling is very slow. Dephosphorylation of twitchin allows it to bind to F-actin, whereas phosphorylation decreases the affinity of the two proteins. Twitchin has been also been shown to be a thick filament-binding protein. These findings raise the possibility that twitchin regulates the myosin cross-bridge cycle and force output by interacting with both actin and myosin resulting in a structure that connects thick and thin filaments in a phosphorylation-dependent manner.
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Affiliation(s)
- Daisuke Funabara
- Faculty of Bioresources, Mie University, Kurimamachiya 1577, 514-8507, Tsu, Mie, Japan.
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21
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Tsutsui Y, Yoshio M, Oiwa K, Yamada A. Striated muscle twitchin of bivalves has "catchability", the ability to bind thick filaments tightly to thin filaments, representing the catch state. J Mol Biol 2006; 365:325-32. [PMID: 17067635 DOI: 10.1016/j.jmb.2006.10.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2006] [Revised: 09/28/2006] [Accepted: 10/02/2006] [Indexed: 11/15/2022]
Abstract
Catch muscles are found in some invertebrates which can maintain high passive tension with little energy expenditure for long periods after their active contraction. Twitchin in the catch muscles has the ability to facilitate the tight binding of thick filaments to thin filaments, which is the structural basis of the catch tension. We defined this ability as catchability and assessed the catchability of twitchins purified from striated muscles of an oyster (Crassostrea gigas) and a scallop (Mimachlamys nobilis), by using an in vitro catch assay where the binding of filaments could be directly visualized under a light microscope. We found that both twitchins had catchability, even though these muscles are not considered to be catch muscles in physiological experiments. In addition, these muscles contained water-soluble factors regulating the binding of the catch, probably protein kinase A and protein phosphatase 2B. These findings suggest that not only bivalve smooth muscles but also striated muscles have a system that regulates their relaxation rate through the catchability of twitchin, at least at the molecular level.
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Affiliation(s)
- Yasutaka Tsutsui
- Graduate School of Life Science, University of Hyogo, Hyogo 678-1297, Japan
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22
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Sobieszek A, Matusovsky OS, Permyakova TV, Sarg B, Lindner H, Shelud'ko NS. Phosphorylation of myorod (catchin) by kinases tightly associated to molluscan and vertebrate smooth muscle myosins. Arch Biochem Biophys 2006; 454:197-205. [PMID: 16970905 DOI: 10.1016/j.abb.2006.08.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2006] [Revised: 07/31/2006] [Accepted: 08/01/2006] [Indexed: 11/19/2022]
Abstract
Myorod, also known as catchin, a newly discovered component of molluscan smooth muscle thick filaments, is an alternative product of the myosin heavy chain gene. It contains a C-terminal rod part that is identical to that part of myosin and a unique N-terminal domain that is very small relative to the myosin head domain. The role of myorod in contraction or relaxation of this muscle type is unknown. In the present study we demonstrated that myorod was phosphorylated not only by a kinase endogenous to molluscan myosin and twitchin but also to vertebrate smooth muscle myosin light chain kinase (MLCK). The rates and maximal levels of phosphorylation were up to threefold higher than those observed by protein kinase A with clear optima at the physiological salt concentrations. Using a mild digestion with chymotrypsin we isolated an 11 kDa phosphopeptide and showed that the phosphorylation site was located at the N-terminal domain of myorod at Thr 141 position. The sequence around this site exhibited a high degree of similarity to that expected for the substrate recognition site of MLCK. The phosphorylation rates strongly depended on the ionic conditions indicating that this site could be readily sterically blocked during myorod polymerization. Another component of the thick filaments involved in regulation of the catch state, twitchin, was phosphorylated by MLCK and exhibited endogenous myorod kinase and MLCK activities. A possible role of these phosphorylation reactions in the regulation of molluscan smooth muscles is discussed.
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Affiliation(s)
- Apolinary Sobieszek
- Institute for Biomedical Aging Research, Life Science Center, Austrian Academy of Sciences, Mitterweg 24, A-6020 Innsbruck, Austria.
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23
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Béjar P, Villamarín JA. Catalytic subunit of cAMP-dependent protein kinase from a catch muscle of the bivalve mollusk Mytilus galloprovincialis: purification, characterization, and phosphorylation of muscle proteins. Arch Biochem Biophys 2006; 450:133-40. [PMID: 16579959 DOI: 10.1016/j.abb.2006.02.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2006] [Revised: 02/23/2006] [Accepted: 02/24/2006] [Indexed: 11/17/2022]
Abstract
cAMP-dependent protein kinase (PKA) plays a crucial role in the release of the catch state of molluskan muscles, but the nature of the enzyme in such tissues is unknown. In this paper, we report the purification of the catalytic (C) subunit of PKA from the posterior adductor muscle (PAM) of the sea mussel Mytilus galloprovincialis. It is a monomeric protein with an apparent molecular mass of 40.0+/-2.0kDa and Stoke's radius 25.1+/-0.3A. The protein kinase activity of the purified enzyme was inhibited by both isoforms of the PKA regulatory (R) subunit that we had previously characterized in the mollusk, and also by the inhibitor peptide PKI(5-24). On the other hand, the main proteins of the contractile apparatus of PAM were partially purified and their ability to be phosphorylated in vitro by purified PKA C subunit was analyzed. The results showed that twitchin, a high molecular mass protein associated with thick filaments, was the better substrate for endogenous PKA. It was rapidly phosphorylated with a stoichiometry of 3.47+/-0.24mol Pmol(-1) protein. Also, catchin, paramyosin, and actin were phosphorylated, although more slowly and to a lesser extent. On the contrary, myosin heavy chain (MHC) and tropomyosin were not phosphorylated under the conditions used.
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Affiliation(s)
- Pablo Béjar
- Departamento de Bioquímica e Bioloxía Molecular, Facultade de Veterinaria, Universidade de Santiago de Compostela, Lugo, Spain
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24
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Abstract
This is the first of a projected series of canonic reviews covering all invertebrate muscle literature prior to 2005 and covers muscle genes and proteins except those involved in excitation-contraction coupling (e.g., the ryanodine receptor) and those forming ligand- and voltage-dependent channels. Two themes are of primary importance. The first is the evolutionary antiquity of muscle proteins. Actin, myosin, and tropomyosin (at least, the presence of other muscle proteins in these organisms has not been examined) exist in muscle-like cells in Radiata, and almost all muscle proteins are present across Bilateria, implying that the first Bilaterian had a complete, or near-complete, complement of present-day muscle proteins. The second is the extraordinary diversity of protein isoforms and genetic mechanisms for producing them. This rich diversity suggests that studying invertebrate muscle proteins and genes can be usefully applied to resolve phylogenetic relationships and to understand protein assembly coevolution. Fully achieving these goals, however, will require examination of a much broader range of species than has been heretofore performed.
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Affiliation(s)
- Scott L Hooper
- Neuroscience Program, Department of Biological Sciences, Irvine Hall, Ohio University, Athens, Ohio 45701, USA.
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Shelud'ko NS, Matusovskaya GG, Permyakova TV, Matusovsky OS. Twitchin, a thick-filament protein from molluscan catch muscle, interacts with F-actin in a phosphorylation-dependent way. Arch Biochem Biophys 2005; 432:269-77. [PMID: 15542066 DOI: 10.1016/j.abb.2004.10.006] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2004] [Indexed: 11/23/2022]
Abstract
Twitchin belongs to the titin-like giant proteins family, it is co-localized with thick filaments in molluscan catch muscles and regulates the catch state depending on its level of phosphorylation. The mechanism by which twitchin controls the catch state remains to be established. We report for the first time the ability of twitchin to interact with F-actin. The interaction is observed at low and physiological ionic strengths, irrespective of the presence or absence of Ca(2+). It was demonstrated by viscosity and turbidity measurements, low- and high-speed co-sedimentation, and with the light-scattering particle size analysis revealing the specific twitchin-actin particles. The twitchin-actin interaction is regulated by twitchin phosphorylation: in vitro phosphorylated twitchin does not interact with F-actin. We speculate that the catch muscle twitchin might provide a mechanical link between thin and thick filaments, which contributes to catch force maintenance.
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Affiliation(s)
- Nikolai S Shelud'ko
- Department of Cell Biophysics, Institute of Marine Biology, Far East Branch of the Russian Academy of Sciences, Vladivostok 690041, Russia.
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26
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Bardales JR, Díaz-Enrich MJ, Ibarguren I, Villamarín JA. Isoforms of cAMP-dependent protein kinase in the bivalve mollusk Mytilus galloprovincialis: activation by cyclic nucleotides and effect of temperature. Arch Biochem Biophys 2004; 432:71-8. [PMID: 15519298 DOI: 10.1016/j.abb.2004.09.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2004] [Revised: 09/06/2004] [Indexed: 11/15/2022]
Abstract
Two different isoforms of cAMP-dependent protein kinase (PKA) have been partially purified from the posterior adductor muscle and the mantle tissue of the sea mussel Mytilus galloprovincialis. The holoenzymes contain as regulatory subunit (R) the previously identified isoforms Rmyt1 and Rmyt2, and were named PKAmyt1 and PKAmyt2, respectively. Both cAMP and cGMP can activate these PKA isoforms completely, although they exhibit a sensitivity approximately 100-fold higher for cAMP than for cGMP. When compared to PKAmyt2, the affinity of PKAmyt1 for cAMP and cGMP is 2- and 3.5-fold higher, respectively. The effect of temperature on the protein kinase activity of both PKA isoforms was examined. Temperature changes did not affect significantly the apparent activation constants (Ka) for cAMP. However, the protein kinase activity was clearly modified and a remarkable difference was observed between both PKA isoforms. PKAmyt1 showed a linear Arrhenius plot over the full range of temperature tested, with an activation energy of 15.3+/-1.5 kJ/mol. By contrast, PKAmyt2 showed a distinct break in the Arrhenius plot at 15 degrees C; the activation energy when temperature was above 15 degrees C was 7-fold higher than that of lower temperatures (70.9+/-8.1 kJ/mol vs 10.6+/-6.5 kJ/mol). These data indicate that, above 15 degrees C, PKAmyt2 activity is much more temperature-dependent than that of PKAmyt1. This different behavior would be related to the different role that these isoforms may play in the tissues where they are located.
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Affiliation(s)
- José R Bardales
- Departamento de Bioquímica e Bioloxía Molecular, Facultade de Veterinaria, Universidade de Santiago de Compostela, Lugo, Spain
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27
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Yamada A, Yoshio M, Nakamura A, Kohama K, Oiwa K. Protein phosphatase 2B dephosphorylates twitchin, initiating the catch state of invertebrate smooth muscle. J Biol Chem 2004; 279:40762-8. [PMID: 15272026 DOI: 10.1074/jbc.m405191200] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
"Catch" is the state where some invertebrate muscles sustain high tension for long periods at low ATP hydrolysis rates. Physiological studies using muscle fibers have not yet fully provided the details of the initiation process of the catch state. The process was extensively studied by using an in vitro reconstitution assay with several phosphatase inhibitors. Actin filaments bound to thick filaments pretreated with the soluble protein fraction of muscle homogenate and Ca2+ (catch treatment) in the presence of MgATP at a low free Ca2+ concentration (the catch state). Catch treatment with > 50 microm okadaic acid, > 1 microm microcystin LR, 1 microm cyclosporin A, 1 microm FK506, or 0.2 mm calcineurin autoinhibitory peptide fragment produced almost no binding of the actin filaments, indicating protein phosphatase 2B (PP2B) was involved. Use of bovine calcineurin (PP2B) and its activator calmodulin instead of the soluble protein fraction initiated the catch state, indicating that only PP2B and calmodulin in the soluble protein fraction are essential for the initiation process. The initiation was reproduced with purified actin, myosin, twitchin, PP2B, and calmodulin. 32P autoradiography showed that only twitchin was dephosphorylated during the catch treatment with either the soluble protein fraction or bovine calcineurin and calmodulin. These results indicate that PP2B directly dephosphorylates twitchin and initiates the catch state and that no other component is required for the initiation process of the catch state.
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Affiliation(s)
- Akira Yamada
- Kansai Advanced Research Center, National Institute of Information and Communications Technology, Kobe, Hyogo 651-2492 Japan.
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28
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Venier P, Pallavicini A, De Nardi B, Lanfranchi G. Towards a catalogue of genes transcribed in multiple tissues of Mytilus galloprovincialis. Gene 2003; 314:29-40. [PMID: 14527715 DOI: 10.1016/s0378-1119(03)00708-x] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Mussels are among the most studied marine organisms because of their ecological role, economic importance and long-standing use in coastal pollution biomonitoring. Despite the bulk of data derived from traditional investigation areas, only limited knowledge is available on mussel genes and their expression in ordinary or stressing conditions. We present here the first data obtained by production and sequencing of 3' end-specific expressed sequence tags (3'ESTs) from multiple tissues of putatively unstressed mussels (Mytilus galloprovincialis). A total of 524 clusters (98 virtual consensuses and 426 singletons) derived from 829 reliable 3'ESTs were searched in the non-redundant (nr) sequence databases (National Centre for Biotechnology Information (Bethesda, USA), NCBI). Most contigs (59%) showed poor or no similarity, thus revealing unknown mussel genes, other contigs recognized some of the few available records of M. galloprovincialis (e.g. actin, cytochrome oxidase III and twitchin) and a number of significant similarities with mitochondrial (mt) or nuclear genes from other organisms were found. Actually, a variety of ribosomal as well as motility- and adhesion-related genes and some genes potentially involved in stress responses (e.g. myticin A, heat shock proteins, methallothionein) were putatively identified. Uniquely, mitochondrial transcripts were primarily represented by a cluster of 123 3'ESTs (1296 base pairs (bp) of the mussel 16S rRNA). In our knowledge, these results provide the first systematic production and annotation of ESTs in M. galloprovincialis. They also represent the first report of a wider project, based on the strategy of 3'EST identification from normal and stressed mussels and intended to define a mussel complementary DNA (cDNA) microarray for genome-wide transcription studies.
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Affiliation(s)
- Paola Venier
- Dipartimento di Biologia, Universitá degli Studi di Padova, Via Bassi 58/B, 35121, Padova, Italy.
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29
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Bullard B, Linke WA, Leonard K. Varieties of elastic protein in invertebrate muscles. J Muscle Res Cell Motil 2003; 23:435-47. [PMID: 12785095 DOI: 10.1023/a:1023454305437] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Elastic proteins in the muscles of a nematode (Caenorhabditis elegans), three insects (Drosophila melanogaster, Anopheles gambiae, Bombyx mori) and a crustacean (Procambus clarkii) were compared. The sequences of thick filament proteins, twitchin in the worm and projectin in the insects, have repeating modules with fibronectin-like (Fn) and immunoglobulin-like (Ig) domains conserved between species. Projectin has additional tandem Igs and an elastic PEVK domain near the N-terminus. All the species have a second elastic protein we have called SLS protein after the Drosophila gene, sallimus. SLS protein is in the I-band. The N-terminal region has the sequence of kettin which is a spliced product of the gene composed of Ig-linker modules binding to actin. Downstream of kettin, SLS protein has two PEVK domains, unique sequence, tandem Igs, and Fn domains at the end. PEVK domains have repeating sequences: some are long and highly conserved and would have varying elasticity appropriate to different muscles. Insect indirect flight muscle (IFM) has short I-bands and electron micrographs of Lethocerus IFM show fine filaments branching from the end of thick filaments to join thin filaments before they enter the Z-disc. Projectin and kettin are in this region and the contribution of these to the high passive stiffness of Drosophila IFM myofibrils was measured from the force response to length oscillations. Kettin is attached both to actin near the Z-disc and to the end of thick filaments, and extraction of actin or digestion of kettin leads to rapid decrease in stiffness; residual tension is attributable to projectin. The wormlike chain model for polymer elasticity fitted the force-extension curve of IFM myofibrils and the number of predicted Igs in the chain is consistent with the tandem Igs in Drosophila SLS protein. We conclude that passive tension is due to kettin and projectin, either separate or linked in series.
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Affiliation(s)
- Belinda Bullard
- European Molecular Biology Laboratory, D-69012 Heidelberg, Germany.
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Funabara D, Watabe S, Mooers SU, Narayan S, Dudas C, Hartshorne DJ, Siegman MJ, Butler TM. Twitchin from molluscan catch muscle: primary structure and relationship between site-specific phosphorylation and mechanical function. J Biol Chem 2003; 278:29308-16. [PMID: 12756258 DOI: 10.1074/jbc.m303272200] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The phosphorylation state of the myosin thick filament-associated mini-titin, twitchin, regulates catch force maintenance in molluscan smooth muscle. The full-length cDNA for twitchin from the anterior byssus retractor muscle of the mussel Mytilus was obtained using PCR and 5'rapid amplification of cDNA ends, and its derived amino acid sequence showed a large molecule ( approximately 530 kDa) with a motif arrangement as follows: (Ig)11(IgFn2)2Ig(Fn)3Ig(Fn)2Ig(Fn)3(Ig)2(Fn)2(Ig)2 FnKinase(Ig)4. Other regions of note include a 79-residue sequence between Ig domains 6 and 7 (from the N terminus) in which more than 60% of the residues are Pro, Glu, Val, or Lys and between the 7th and 8th Ig domains, a DFRXXL motif similar to that thought to be necessary for high affinity binding of myosin light chain kinase to F-actin. Two major phosphorylation sites, i.e. D1 and D2, were located in linker regions between Ig domains 7 and 8 and Ig domains 21 and 22, respectively. Correlation of the phosphorylation state of twitchin, using antibodies specific to D1 and D2, with mechanical properties suggested that phosphorylation of both D1 and D2 is required for relaxation from the catch state.
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Affiliation(s)
- Daisuke Funabara
- Laboratory of Aquatic Molecular Biology and Biotechnology, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan
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31
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Díaz-Enrich MJ, Ibarguren I, Hellman U, Villamarín JA. Characterization of a type I regulatory subunit of cAMP-dependent protein kinase from the bivalve mollusk Mytilus galloprovincialis. Arch Biochem Biophys 2003; 416:119-27. [PMID: 12859988 DOI: 10.1016/s0003-9861(03)00259-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two isoforms of the regulatory subunit (R) of cAMP-dependent protein kinase (PKA), named R(myt1) and R(myt2), had been purified in our laboratory from two different tissues of the sea mussel Mytilus galloprovincialis. In this paper, we report the sequences of several peptides obtained from tryptic digestion of R(myt1). As a whole, these sequences showed high homology with regions of type I R subunits from invertebrate and also from mammalian sources, but homology with those of fungal and type II R subunits was much lower, which indicates that R(myt1) can be considered as a type I R isoform. This conclusion is also supported by the following biochemical properties: (1) R(myt1) was proved to have interchain disulfide bonds stabilizing its dimeric structure; (2) it failed to be phosphorylated by the catalytic (C) subunit purified from mussel; (3) it has a higher pI value than that of the R(myt2) isoform; and (4) it showed cross-reactivity with mammalian anti-RIbeta antibody.
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Affiliation(s)
- María J Díaz-Enrich
- Departamento de Bioqui;mica e Bioloxi;a Molecular, Facultade de Veterinaria, Universidade de Santiago de Compostela, Campus de Lugo, 27002, Lugo, Spain
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