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- ***************************************************
- * Single-strand binding protein family signatures *
- ***************************************************
-
- The Escherichia coli single-strand binding protein [1] (gene ssb), also known
- as the helix-destabilizing protein, is a protein of 177 amino acids. It
- binds tightly, as a homotetramer, to single-stranded DNA (ss-DNA) and plays an
- important role in DNA replication, recombination and repair.
-
- Closely related variants of SSB are encoded in the genome of a variety of
- large self-transmissible plasmids. SSB has also been characterized in bacteria
- such as Proteus mirabilis or Serratia marcescens.
-
- Eukaryotic mitochondrial proteins that bind ss-DNA and are probably involved
- in mitochondrial DNA replication are structurally and evolutionary related to
- prokaryotic SSB. Proteins currently known to belong to this subfamily are
- listed below.
-
- - Mammalian protein Mt-SSB (P16) [2].
- - Xenopus Mt-SSBs and Mt-SSBr [3].
- - Yeast protein RIM1.
-
- We have developed two signature patterns for these proteins. The first is a
- conserved region in the N-terminal section of the SSB's. The second is a
- centrally located region which, in Escherichia coli SSB, is known to be
- involved in the binding of DNA.
-
- -Consensus pattern: [LIVMF]-x-[KR]-[LIVM]-x-[LIVM](2)-G-[NR]-[LIVM]-G-x-[DE]
- -Sequences known to belong to this class detected by the pattern: Almost all
- of them, with a few exceptions.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: T-x-W-[HY]-[RN]-[LIVM]-x-[LIVM]-F
- -Sequences known to belong to this class detected by the pattern: Almost all
- of them, with a few exceptions.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / Text revised.
-
- [ 1] Meyer R.R., Laine P.S.
- Microbiol. Rev. 54:342-380(1990).
- [ 2] Tiranti V., Zeviani M., Rocchi M., Di Donato S.
- Gene 126:219-225(1993).
- [ 3] Ghrir R., Lecaer J.-P., Dufresne C., Barat-Gueride M.
- Arch. Biochem. Biophys. 291:395-400(1991).
- [ 4] van Dick E., Foury F., Stillman B., Brill S.J.
- EMBO J. 11:3421-3430(1992).
-