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          Institute: MPI für Biochemie     Collection: Membrane Biochemistry (D. Oesterhelt)     Display Documents

ID: 41398.0, MPI für Biochemie / Membrane Biochemistry (D. Oesterhelt)
Discovery of two novel families of proteins that are proposed to interact with prokaryotic SMC proteins, and characterization of the Bacillus subtilis family members ScpA and ScpB
Authors:Soppa, J.; Kobayashi, K.; Noirot-Gros, M. F.; Oesterhelt, D.; Ehrlich, S. D.; Dervyn, E.; Ogasawara, N.; Moriya, S.
Date of Publication (YYYY-MM-DD):2002-07
Title of Journal:Molecular Microbiology
Journal Abbrev.:Mol. Microbiol.
Issue / Number:1
Start Page:59
End Page:71
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Structural maintenance of chromosomes (SMC) proteins are present in all eukaryotes and in many prokaryotes. Eukaryotic SMC proteins form complexes with various non-SMC subunits, which affect their function, whereas the prokaryotic homologues had no known non-SMC partners and were thought to act as simple homodimers. Here we describe two novel families of proteins, widespread in archaea and (Gram-positive) bacteria, which we denote 'segregation and condensation proteins' (Scps). ScpA genes are localized next to smc genes in nearly all SMC- containing archaea, suggesting that they belong to the same operon and are thus involved in a common process in the cell. The function of ScpA was studied in Bacillus subtilis, which also harbours a well characterized smc gene. Here we show that scpA mutants display characteristic phenotypes nearly identical to those of smc mutants, including temperature- sensitive growth, production of anucleate cells, formation of aberrant nucleoids, and chromosome splitting by the so-called guillotine effect. Thus, both SMC and ScpA are required for chromosome segregation and condensation. Interestingly, mutants of another B. subtilis gene, scpB, which is localized downstream from scpA, display the same phenotypes, which indicate that ScpB is also involved in these functions. ScpB is generally present in species that also encode ScpA. The physical interaction of ScpA and SMC was proven (i) by the use of the yeast two-hybrid system and (ii) by the isolation of a complex containing both proteins from cell extracts of B. subtilis . By extension, we speculate that interaction of orthologues of the two proteins is important for chromosome segregation in many archaea and bacteria, and propose that SMC proteins generally have non-SMC protein partners that affect their function not only in eukaryotes but also in prokaryotes.
Comment of the Author/Creator:Date: 2002, JUL
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Biochemie/Membrane Biochemistry (D. Oesterhelt)
External Affiliations:Univ Frankfurt, Biozentrum, Inst Mikrobiol, D-60439 Frankfurt,; Germany; Univ Frankfurt, Biozentrum, Inst Mikrobiol, D-60439 Frankfurt, Germany; Nara Inst Sci & Technol, Grad Sch Biol Sci, Nara 6300101, Japan; INRA, Lab GEnet Microbienne, F-78352 Jouy En Josas, France
Identifiers:ISI:000176529800006 [ID No:1]
ISSN:0950-382X [ID No:2]
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