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- * Small, acid-soluble spore proteins, alpha/beta type, signatures *
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-
- Small, acid-soluble spore proteins (SASP or ASSP) [1,2] are proteins found in
- the spores of bacteria of the genera Bacillus, Thermoactynomycetes, and
- Clostridium. SASP are bound to spore DNA. They are double-stranded DNA-binding
- proteins that cause DNA to change to an A-like conformation. They protect the
- DNA backbone from chemical and enzymatic cleavage and are thus involved in
- dormant spore's high resistance to UV light. SASP are degraded in the first
- minutes of spore germination and provide amino acids for both new protein
- synthesis and metabolism.
-
- There are two distinct families of SASP: the alpha/beta type and the gamma-
- type. Alpha/beta SASP are small proteins of about sixty to seventy amino acid
- residues. They are generally coded by a multigene family. Two regions of
- alpha/beta SASP are particularly well conserved: the first region is located
- in the N-terminal half and contains the site which is cleaved by a SASP-
- specific protease that acts during germination; the second region is located
- in the C-terminal section and is probably involved in DNA-binding. We selected
- both regions as signature patterns for these proteins.
-
- -Consensus pattern: K-x-E-[IV]-A-x-E-[LIVMF]-G-[LIVM]
- [The cleavage site is between the first E and I/V]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [KR]-[SAQ]-x-G-x-V-G-G-x-[LIVM]-x-[KR](2)-[LIVM](2)
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1992 / Patterns and text revised.
-
- [ 1] Setlow P.
- Annu. Rev. Microbiol. 42:319-338(1988).
- [ 2] Setlow P.
- J. Bacteriol. 174:2737-2741(1992).
-