1
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Zhang C, Liu W, Deng J, Ma S, Chang Z, Yang J. Structural Insights into the Interaction between Bacillus subtilis SepF Assembly and FtsZ by Solid-State NMR Spectroscopy. J Phys Chem B 2022; 126:5219-5230. [PMID: 35799411 DOI: 10.1021/acs.jpcb.2c02810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In many species of Gram-positive bacteria, SepF participated in the membrane tethering of FtsZ Z-ring during bacteria division. However, atomic-level details of interaction between SepF and FtsZ in an assembled state are lacking. Here, by combining solid-state NMR (SSNMR) with biochemical analyses, the interaction of Bacillus subtilis SepF and the C-terminal domain (CTD) of FtsZ was investigated. We obtained near complete chemical shift assignments of SepF and determined the structural model of the SepF monomer. Interaction with FtsZ-CTD caused further packing of SepF rings, and SSNMR experiments revealed the affected residues locating at α1, α2, β3, and β4 of SepF. Solution NMR experiments of dimeric SepF constructed by point mutation strategy proved a prerequisite role of α-α interface formation in SepF for FtsZ binding. Overall, our results provide structural insights into the mechanisms of SepF-FtsZ interaction for better understanding the function of SepF in bacteria.
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Affiliation(s)
- Chang Zhang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.,National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
| | - Wenjing Liu
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jing Deng
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
| | - Shaojie Ma
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.,National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
| | - Ziwei Chang
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
| | - Jun Yang
- Key Laboratory of Molecular Biophysics of the Ministry of Education, College of Life Science and Technology, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.,National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, P. R. China
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2
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Essential dynamic interdependence of FtsZ and SepF for Z-ring and septum formation in Corynebacterium glutamicum. Nat Commun 2020; 11:1641. [PMID: 32242019 PMCID: PMC7118173 DOI: 10.1038/s41467-020-15490-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 03/09/2020] [Indexed: 12/25/2022] Open
Abstract
The mechanisms of Z-ring assembly and regulation in bacteria are poorly understood, particularly in non-model organisms. Actinobacteria, a large bacterial phylum that includes the pathogen Mycobacterium tuberculosis, lack the canonical FtsZ-membrane anchors and Z-ring regulators described for E. coli. Here we investigate the physiological function of Corynebacterium glutamicum SepF, the only cell division-associated protein from Actinobacteria known to interact with the conserved C-terminal tail of FtsZ. We show an essential interdependence of FtsZ and SepF for formation of a functional Z-ring in C. glutamicum. The crystal structure of the SepF–FtsZ complex reveals a hydrophobic FtsZ-binding pocket, which defines the SepF homodimer as the functional unit, and suggests a reversible oligomerization interface. FtsZ filaments and lipid membranes have opposing effects on SepF polymerization, indicating that SepF has multiple roles at the cell division site, involving FtsZ bundling, Z-ring tethering and membrane reshaping activities that are needed for proper Z-ring assembly and function. The mechanisms of Z-ring assembly and regulation in bacteria are poorly understood, particularly in non-model organisms. Here, Sogues et al. study the interaction between FtsZ and SepF in Corynebacterium glutamicum, showing an essential interdependence of these proteins for formation of a functional Z-ring.
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3
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Lee DS, Kim Y, Lee HS. The whcD gene of Corynebacterium glutamicum plays roles in cell division and envelope formation. Microbiology (Reading) 2017; 163:131-143. [DOI: 10.1099/mic.0.000399] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Dong-Seok Lee
- Department of Biotechnology and Bioinformatics, Korea University, 2511 Sejong-ro, Sejong-si 339-700, Republic of Korea
| | - Younhee Kim
- Department of Korean Medicine, Semyung University, 65 Semyung-ro, Jecheon-si, Chungbuk 390-711, Republic of Korea
| | - Heung-Shick Lee
- Department of Biotechnology and Bioinformatics, Korea University, 2511 Sejong-ro, Sejong-si 339-700, Republic of Korea
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4
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Gola S, Munder T, Casonato S, Manganelli R, Vicente M. The essential role of SepF in mycobacterial division. Mol Microbiol 2015; 97:560-76. [DOI: 10.1111/mmi.13050] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/02/2015] [Indexed: 12/19/2022]
Affiliation(s)
- Susanne Gola
- Centro Nacional de Biotecnología - CSIC; Calle Darwin 3 28049 Madrid Spain
| | - Thomas Munder
- Department of Medical Engineering and Biotechnology; Ernst-Abbe-Hochschule Jena - University of Applied Sciences; Carl-Zeiss-Promenade 2 07745 Jena Germany
| | - Stefano Casonato
- Department of Molecular Medicine; University of Padova; V. Gabelli 63 35121 Padova Italy
| | - Riccardo Manganelli
- Department of Molecular Medicine; University of Padova; V. Gabelli 63 35121 Padova Italy
| | - Miguel Vicente
- Centro Nacional de Biotecnología - CSIC; Calle Darwin 3 28049 Madrid Spain
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5
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Characterization of a Corynebacterium glutamicum dnaB mutant that shows temperature-sensitive growth and mini-cell formation. Arch Microbiol 2014; 196:871-9. [PMID: 25141796 DOI: 10.1007/s00203-014-1026-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Revised: 08/05/2014] [Accepted: 08/06/2014] [Indexed: 10/24/2022]
Abstract
Corynebacterium glutamicum is known to perform a unique form of cell division called post-fission snapping division. In order to investigate the mechanism of cell division of this bacterium, we isolated temperature-sensitive mutants from C. glutamicum wild-type strain ATCC 31831, and found that one of them, M45, produced high frequencies of mini-cells with no nucleoids. Cell pairs composed of an elongated cell, with one nucleoid, connected to a mini-cell, with no nucleoids, were occasionally observed. The temperature sensitivity and mini-cell formation of M45 was complemented by a 2-kb DraI-EcoRI fragment derived from the ATCC 31831 chromosomal DNA, which carried a dnaB homolog encoding a replicative DNA helicase. DNA sequence analysis revealed that M45 carried a missense mutation in the dnaB gene, which caused a substitution of Thr364 to Ile. Microscopic observation after 4',6-diamidino-2-phenylindole staining revealed that the DNA content of single cells was decreased by culturing at the restrictive temperature, suggesting that the mutation affects chromosomal replication. These results suggest that the C. glutamicum dnaB mutant performs an asymmetric cell division even after DNA replication is inhibited, which results in the production of mini-cells.
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6
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7
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Doerks T, van Noort V, Minguez P, Bork P. Annotation of the M. tuberculosis hypothetical orfeome: adding functional information to more than half of the uncharacterized proteins. PLoS One 2012; 7:e34302. [PMID: 22485162 PMCID: PMC3317503 DOI: 10.1371/journal.pone.0034302] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2011] [Accepted: 02/26/2012] [Indexed: 11/18/2022] Open
Abstract
The genome of Mycobacterium tuberculosis (H37Rv) contains 4,019 protein coding genes, of which more than thousand have been categorized as ‘hypothetical’ implying that for these not even weak functional associations could be identified so far. We here predict reliable functional indications for half of this large hypothetical orfeome: 497 genes can be annotated based on orthology, and another 125 can be linked to interacting proteins via integrated genomic context analysis and literature mining. The assignments include newly identified clusters of interacting proteins, hypothetical genes that are associated to well known pathways and putative disease-relevant targets. All together, we have raised the fraction of the proteome with at least some functional annotation to 88% which should considerably enhance the interpretation of large-scale experiments targeting this medically important organism.
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Affiliation(s)
- Tobias Doerks
- European Molecular Biology Laboratory, Heidelberg, Germany.
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8
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Cytoskeletal proteins of actinobacteria. Int J Cell Biol 2012; 2012:905832. [PMID: 22481946 PMCID: PMC3296230 DOI: 10.1155/2012/905832] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 10/06/2011] [Accepted: 10/23/2011] [Indexed: 11/19/2022] Open
Abstract
Although bacteria are considered the simplest life forms, we are now slowly unraveling their cellular complexity. Surprisingly, not only do bacterial cells have a cytoskeleton but also the building blocks are not very different from the cytoskeleton that our own cells use to grow and divide. Nonetheless, despite important advances in our understanding of the basic physiology of certain bacterial models, little is known about Actinobacteria, an ancient group of Eubacteria. Here we review current knowledge on the cytoskeletal elements required for bacterial cell growth and cell division, focusing on actinobacterial genera such as Mycobacterium, Corynebacterium, and Streptomyces. These include some of the deadliest pathogens on earth but also some of the most prolific producers of antibiotics and antitumorals.
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Deletion of cgR_1596 and cgR_2070, encoding NlpC/P60 proteins, causes a defect in cell separation in Corynebacterium glutamicum R. J Bacteriol 2008; 190:8204-14. [PMID: 18931118 DOI: 10.1128/jb.00752-08] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In previous work, random genome deletion mutants of Corynebacterium glutamicum R were generated using the insertion sequence (IS) element IS31831 and the Cre/loxP excision system. One of these mutants, C. glutamicum strain RD41, resulting from the deletion of a 10.1-kb genomic region (DeltacgR_1595 through cgR_1604) from the WT strain, showed cell elongation, and several lines appeared on the cell surface (bamboo shape). The morphological changes were suppressed by overexpression of cgR_1596. Single disruption of cgR_1596 in WT C. glutamicum R resulted in morphological changes similar to those observed in the RD41 strain. CgR_1596 has a predicted secretion signal peptide in the amino-terminal region and a predicted NlpC/P60 domain, which is conserved in cell wall hydrolases, in the carboxyl-terminal region. In C. glutamicum R, CgR_0802, CgR_1596, CgR_2069, and CgR_2070 have the NlpC/P60 domain; however, only simultaneous disruption of cgR_1596 and cgR_2070, and not cgR_2070 single disruption, resulted in cell growth delay and more severe morphological changes than disruption of cgR_1596. Transmission electron microscopy revealed multiple septa within individual cells of cgR_1596 single and cgR_1596-cgR_2070 double disruptants. Taken together, these results suggest that cgR_1596 and cgR_2070 are involved in cell separation and cell growth in C. glutamicum.
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10
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Letek M, Fiuza M, Ordóñez E, Villadangos AF, Ramos A, Mateos LM, Gil JA. Cell growth and cell division in the rod-shaped actinomycete Corynebacterium glutamicum. Antonie van Leeuwenhoek 2008; 94:99-109. [PMID: 18283557 DOI: 10.1007/s10482-008-9224-4] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2007] [Accepted: 01/29/2008] [Indexed: 10/22/2022]
Abstract
Bacterial cell growth and cell division are highly complicated and diversified biological processes. In most rod-shaped bacteria, actin-like MreB homologues produce helicoidal structures along the cell that support elongation of the lateral cell wall. An exception to this rule is peptidoglycan synthesis in the rod-shaped actinomycete Corynebacterium glutamicum, which is MreB-independent. Instead, during cell elongation this bacterium synthesizes new cell-wall material at the cell poles whereas the lateral wall remains inert. Thus, the strategy employed by C. glutamicum to acquire a rod-shaped morphology is completely different from that of Escherichia coli or Bacillus subtilis. Cell division in C. glutamicum also differs profoundly by the apparent absence in its genome of homologues of spatial or temporal regulators of cell division, and its cell division apparatus seems to be simpler than those of other bacteria. Here we review recent advances in our knowledge of the C. glutamicum cell cycle in order to further understand this very different model of rod-shape acquisition.
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Affiliation(s)
- Michal Letek
- Departamento de Biología Molecular. Area de Microbiología. Facultad de Biología, Universidad de León, Leon 24071, Spain
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11
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Kim Y, Maltseva N, Dementieva I, Collart F, Holzle D, Joachimiak A. Crystal structure of hypothetical protein YfiH from Shigella flexneri at 2 A resolution. Proteins 2006; 63:1097-101. [PMID: 16498617 PMCID: PMC2792012 DOI: 10.1002/prot.20589] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | | | | | | | | | - Andrzej Joachimiak
- Correspondence to: Andrzej Joachimiak, Biosciences Division, Midwest Center for Structural Genomics and Structural Biology, Center, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439.
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12
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Ramos A, Letek M, Campelo AB, Vaquera J, Mateos LM, Gil JA. Altered morphology produced by ftsZ expression in Corynebacterium glutamicum ATCC 13869. Microbiology (Reading) 2005; 151:2563-2572. [PMID: 16079335 DOI: 10.1099/mic.0.28036-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Corynebacterium glutamicum is a Gram-positive bacterium that lacks the cell division FtsA protein and actin-like MreB proteins responsible for determining cylindrical cell shape. When the cell division ftsZ gene from C. glutamicum (ftsZCg
) was cloned in different multicopy plasmids, the resulting constructions could not be introduced into C. glutamicum; it was assumed that elevated levels of FtsZ
Cg
result in lethality. The presence of a truncated ftsZCg
and a complete ftsZCg
under the control of Plac led to a fourfold reduction in the intracellular levels of FtsZ, generating aberrant cells displaying buds, branches and knots, but no filaments. A 20-fold reduction of the FtsZ level by transformation with a plasmid carrying the Escherichia coli lacI gene dramatically reduced the growth rate of C. glutamicum, and the cells were larger and club-shaped. Immunofluorescence microscopy of FtsZ
Cg
or visualization of FtsZ
Cg
–GFP in C. glutamicum revealed that most cells showed one fluorescent band, most likely a ring, at the mid-cell, and some cells showed two fluorescent bands (septa of future daughter cells). When FtsZ
Cg
–GFP was expressed from Plac, FtsZ rings at mid-cell, or spirals, were also clearly visible in the aberrant cells; however, this morphology was not entirely due to GFP but also to the reduced levels of FtsZ expressed from Plac. Localization of FtsZ at the septum is not negatively regulated by the nucleoid, and therefore the well-known occlusion mechanism seems not to operate in C. glutamicum.
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Affiliation(s)
- Angelina Ramos
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - Michal Letek
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - Ana Belén Campelo
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - José Vaquera
- Departamento de Biología Celular, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - Luis M Mateos
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - José A Gil
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
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13
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Ramos A, Honrubia MP, Vega D, Ayala JA, Bouhss A, Mengin-Lecreulx D, Gil JA. Characterization and chromosomal organization of the murD-murC-ftsQ region of Corynebacterium glutamicum ATCC 13869. Res Microbiol 2004; 155:174-84. [PMID: 15059630 DOI: 10.1016/j.resmic.2003.11.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2003] [Accepted: 11/20/2003] [Indexed: 11/28/2022]
Abstract
The sequence of a 4.6-kb region of DNA from Corynebacterium glutamicum ATCC 13869 lying upstream from the ftsQ-ftsZ region has been determined. The region contains four genes with high similarity to the murD, ftsW, murG, and murC genes from different microorganisms. The products of these mur genes probably catalyse several steps in the formation of the precursors for peptidoglycan synthesis in C. glutamicum, whereas ftsW might play also a role in the stabilisation of the FtsZ ring during cell division. The murC gene product was purified to near homogeneity and its UDP-N-acetylmuramate: L-alanine adding activity was demonstrated. Northern analysis indicated that ftsW, murG and ftsQ are poorly expressed in C. glutamicum whereas murC and ftsZ are expressed at higher levels at the beginning of the exponential phase. Dicistronic (ftsQ-ftsZ) and monocistronic (murC and ftsZ) transcripts can be detected using specific probes and are in agreement with the lack of transcriptional terminators in the partially analysed dcw cluster. Disruption experiments performed in C. glutamicum using internal fragments of the ftsW, murG and murC genes allowed us to conclude that FtsW, MurG, and MurC are essential gene products in C. glutamicum.
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MESH Headings
- Base Sequence
- Blotting, Northern
- Cell Wall/genetics
- Cell Wall/metabolism
- Chromosome Mapping
- Cloning, Molecular
- Corynebacterium/enzymology
- Corynebacterium/genetics
- Corynebacterium/metabolism
- DNA, Bacterial/chemistry
- DNA, Bacterial/genetics
- Genes, Bacterial/genetics
- Genes, Bacterial/physiology
- Genes, Essential/physiology
- Genetic Complementation Test
- Molecular Sequence Data
- Mutagenesis, Insertional
- Plasmids
- Polymerase Chain Reaction
- Sequence Analysis, DNA
- Transformation, Genetic
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Affiliation(s)
- Angelina Ramos
- Area de Microbiología, Departamento de Ecología, Genética y Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
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14
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Ramos A, Honrubia MP, Valbuena N, Vaquera J, Mateos LM, Gil JA. Involvement of DivIVA in the morphology of the rod-shaped actinomycete Brevibacterium lactofermentum. MICROBIOLOGY-SGM 2004; 149:3531-3542. [PMID: 14663085 DOI: 10.1099/mic.0.26653-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In Brevibacterium lactofermentum, as in many Gram-positive bacteria, a divIVA gene is located downstream from the dcw cluster of cell-division- and cell-wall-related genes. This gene (divIVA(BL)) is mostly expressed during exponential growth, and the protein encoded, DivIVA(BL,) bears some sequence similarity to antigen 84 (Ag84) from mycobacteria and was detected with monoclonal antibodies against Ag84. Disruption experiments using an internal fragment of the divIVA(BL) gene or a disrupted divIVA(BL) cloned in a suicide conjugative plasmid were unsuccessful, suggesting that the divIVA(BL) gene is needed for cell viability in BREV: lactofermentum. Transformation of BREV: lactofermentum with a multicopy plasmid containing divIVA(BL) drastically altered the morphology of the corynebacterial cells, which became larger and bulkier, and a GFP fusion to DivIVA(BL) mainly localized to the ends of corynebacterial cells. This localization pattern, together with the overproduction phenotype, suggests that DivIVA may be important in regulating the apical growth of daughter cells.
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MESH Headings
- Amino Acid Sequence
- Antibodies, Bacterial
- Antibodies, Monoclonal
- Antigens, Bacterial/genetics
- Bacterial Proteins/genetics
- Bacterial Proteins/immunology
- Bacterial Proteins/metabolism
- Base Sequence
- Brevibacterium/genetics
- Brevibacterium/immunology
- Brevibacterium/metabolism
- Brevibacterium/ultrastructure
- Cell Cycle Proteins/genetics
- Cell Cycle Proteins/immunology
- Cell Cycle Proteins/metabolism
- Cloning, Molecular
- DNA, Bacterial/genetics
- Escherichia coli/genetics
- Escherichia coli/metabolism
- Gene Expression
- Gene Targeting
- Genes, Bacterial
- Microscopy, Electron, Scanning
- Molecular Sequence Data
- Multigene Family
- Plasmids/genetics
- Recombinant Fusion Proteins/genetics
- Recombinant Fusion Proteins/metabolism
- Recombination, Genetic
- Sequence Homology, Amino Acid
- Transformation, Genetic
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Affiliation(s)
- Angelina Ramos
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - María Pilar Honrubia
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - Noelia Valbuena
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - José Vaquera
- Departamento de Biología Celular, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - Luis M Mateos
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
| | - José A Gil
- Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain
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15
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Adham SA, Campelo AB, Ramos A, Gil JA. Construction of a xylanase-producing strain of Brevibacterium lactofermentum by stable integration of an engineered xysA gene from Streptomyces halstedii JM8. Appl Environ Microbiol 2001; 67:5425-30. [PMID: 11722888 PMCID: PMC93325 DOI: 10.1128/aem.67.12.5425-5430.2001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A xylanolytic strain of Brevibacterium lactofermentum containing the Streptomyces halstedii His-tagged xysA gene was generated. The new strain contains DNA derived from S. halstedii, expresses xylanolytic activity, and was obtained by an integrative process mediated by a conjugative plasmid targeted to a dispensable chromosomal region located downstream from the essential cell division gene ftsZ. The His-tagged Xys1 enzyme was constitutively expressed under the control of the kan promoter from Tn5 and was easily purified by use of Ni-nitrilotriacetic acid-agarose. The new strain is stable for more than 200 generations, lacks any known antibiotic resistance gene, and does not need any selective pressure to maintain the integrated gene. This strategy can be used to integrate any gene into the B. lactofermentum chromosome and to maintain it stably without the use of antibiotics for selection.
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Affiliation(s)
- S A Adham
- Departamento de Ecología, Genética y Microbiología, Area de Microbiología, Facultad de Biología, Universidad de León, Spain
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