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Luo M, Ding LW, Ge ZJ, Wang ZY, Hu BL, Yang XB, Sun QY, Xu ZF. The characterization of SaPIN2b, a plant trichome-localized proteinase inhibitor from Solanum americanum. Int J Mol Sci 2012; 13:15162-76. [PMID: 23203117 PMCID: PMC3509633 DOI: 10.3390/ijms131115162] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2012] [Revised: 10/09/2012] [Accepted: 10/29/2012] [Indexed: 12/28/2022] Open
Abstract
Proteinase inhibitors play an important role in plant resistance of insects and pathogens. In this study, we characterized the serine proteinase inhibitor SaPIN2b, which is constitutively expressed in Solanum americanum trichomes and contains two conserved motifs of the proteinase inhibitor II (PIN2) family. The recombinant SaPIN2b (rSaPIN2b), which was expressed in Escherichia coli, was demonstrated to be a potent proteinase inhibitor against a panel of serine proteinases, including subtilisin A, chymotrypsin and trypsin. Moreover, rSaPIN2b also effectively inhibited the proteinase activities of midgut trypsin-like proteinases that were extracted from the devastating pest Helicoverpa armigera. Furthermore, the overexpression of SaPIN2b in transgenic tobacco plants resulted in enhanced resistance against H. armigera. Taken together, our results demonstrated that SaPIN2b is a potent serine proteinase inhibitor that may act as a protective protein in plant defense against insect attacks.
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Affiliation(s)
- Ming Luo
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
| | - Ling-Wen Ding
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
| | - Zhi-Juan Ge
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
| | - Zhen-Yu Wang
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
| | - Bo-Lun Hu
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
| | - Xiao-Bei Yang
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
| | - Qiao-Yang Sun
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
| | - Zeng-Fu Xu
- State Key Laboratory of Biocontrol and Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China; E-Mails: (M.L.); (L.-W.D.); (Z.-J.G.); (Z.-Y.W.); (B.-L.H.); (X.-B.Y.); (Q.-Y.S.)
- Key Laboratory of Tropical Plant Resource and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Yunnan 666303, China
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Mur LAJ, Xu R, Casson SA, Stoddart WM, Routledge APM, Draper J. Characterization of a proteinase inhibitor from Brachypodium distachyon suggests the conservation of defence signalling pathways between dicotyledonous plants and grasses. Mol Plant Pathol 2004; 5:267-80. [PMID: 20565595 DOI: 10.1111/j.1364-3703.2004.00225.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
SUMMARY Proteinase inhibitors (PIs) are established markers for wound- and especially jasmonate-mediated signalling in dicot species such as tomato and potato. Differential screening of a cDNA library constructed from RNA isolated from wounded leaves of the grass Brachypodium distachyon led to the identification of a proteinase inhibitor gene (Bdpin1). Bdpin1 exhibited the highest homology to the subtilisin/chymotrypsin-inhibiting subgroup of the pin1 class of plant PIs. Northern analyses indicated that Bdpin1 was induced within 6 h at the site of wounding and systemically, by 24 h, thereby providing evidence for long-distance signalling in grasses. Bdpin1 also proved to be more rapidly induced in susceptible than in resistant ecotypes of B. distachyon following challenge with the Rice blast pathogen, Magnaporthe grisea. Screening with chemical signals indicated that Bdpin1 could be induced with MeJA but not with the putative mimic of salicylic acid, benzothiadiazole. Genomic Southern hybridization was consistent with Bdpin1 existing at a single locus, which was isolated following screening of a genomic cosmid library. DNA upstream of the Bdpin1 coding sequence was characterized via fusion to a GUS reporter and was found to confer wound-responsive transcription in B. distachyon and other cereals following biolistic bombardment. Both wound- and TMV-activated Bdpin1-GUS activity was detected in transgenic tobacco. Given that B. distachyon represents an ancestral grass species, our data suggest that there is considerable conservation in defence-associated signalling between dicots and grasses.
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Affiliation(s)
- Luis A J Mur
- Institute of Biological Sciences, Edward Llwyd Building, University of Wales, Aberystwyth, Ceredigion, SY23 3DA, UK
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Murray C, Sutherland PW, Phung MM, Lester MT, Marshall RK, Christeller JT. Expression of biotin-binding proteins, avidin and streptavidin, in plant tissues using plant vacuolar targeting sequences. Transgenic Res 2002; 11:199-214. [PMID: 12054353 DOI: 10.1023/a:1015237610263] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Tobacco plants have been developed which constitutively express high levels of the biotin-binding proteins, avidin and streptavidin. These plants were phenotypically normal and produced fertile pollen and seeds. The transgene was expressed and its product located in the vacuoles of most cell types in the plants. Targeting was achieved by use of N-terminal vacuolar targeting sequences derived from potato proteinase inhibitors which are known to target constitutively to vacuoles in potato tubers and, under wound-induction, in tomato leaves. Avidin was located in protein body-like structures within the vacuole and transgene protein levels remained relatively constant throughout the lifetime of the leaf. We describe two chimeric constructs with similar levels of expression. One comprised a potato proteinase inhibitor I signal peptide cDNA sequence attached to an avidin cDNA and the second a potato proteinase inhibitor II signal peptide genomic sequence (including an intron) attached to a core streptavidin synthetic sequence. We were unable to regenerate plants when transformation used constructs lacking the targeting sequences. The highest levels observed (up to 1.5% of total leaf protein) confirm the vacuole as the organelle of choice for stable storage of plant-toxic transgene products. The efficient targeting of these proteins did not result in any measured changes in plant biotin metabolism.
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Affiliation(s)
- Colleen Murray
- The Horticulture and Food Research Institute of New Zealand, Palmerston North Research Centre
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Antcheva N, Pintar A, Patthy A, Simoncsits A, Barta E, Tchorbanov B, Pongor S. Proteins of circularly permuted sequence present within the same organism: the major serine proteinase inhibitor from Capsicum annuum seeds. Protein Sci 2001; 10:2280-90. [PMID: 11604534 PMCID: PMC2374053 DOI: 10.1110/ps.21701] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
The major serine proteinase inhibitor from bell pepper (Capsicum annuum, paprika) seeds was isolated, characterized, and sequenced, and its disulfide bond topology was determined. PSI-1.2 is a 52-amino-acid-long, cysteine-rich polypeptide that inhibits both trypsin (K(i) = 4.6 x 10(-9) M) and chymotrypsin (K(i) = 1.1 x 10(-8) M) and is a circularly permuted member of the potato type II inhibitor family. Mature proteins of this family are produced from precursor proteins containing two to eight repeat units that are proteolytically cleaved within, rather than between, the repeats. In contrast, PSI-1.2 corresponds to a complete repeat that was predicted as the putative ancestral protein of the potato type II family. To our knowledge, this is the first case in which two proteins related to each other by circular permutation are shown to exist in the same organism and are expressed within the same organ. PSI-1.2 is not derived from any of the known precursors, and it contains a unique amphiphilic segment in one of its loops. A systematic comparison of the related precursor repeat-sequences reveals common evolutionary patterns that are in agreement with the ancestral gene-duplication hypothesis.
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Affiliation(s)
- N Antcheva
- International Centre for Genetic Engineering and Biotechnology, Protein Structure and Function Group, 34012 Trieste, Italy
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