The Enzyme Database

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Accepted name: SpoIVB peptidase
Reaction: Self-cleaves Val52┼Asn53, Ala62┼Phe63 and Val74┼Thr75 at the N-terminus of SpoIVB
Other name(s): sporulation factor IV B protease
Comments: This enzyme plays a central role in a regulatory checkpoint (the σK checkpoint), which coordinates gene expression during the later stages of spore formation in Bacillus subtilis [1,3]. The enzyme activates proteolytic processing of a sporulation-specific sigma factor, pro-σK, to its mature and active form, σK, by self-cleavage [1,3]. The enzyme is also subject to secondary proteolysis, which presumably inactivates SpoIVB [3]. The enzyme is also essential for the formation of heat-resistant spores. Belongs in peptidase family S55.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 296241-18-4
1.  Wakeley, P.R., Dorazi, R., Hoa, N.T., Bowyer, J.R. and Cutting, S.M. Proteolysis of SpolVB is a critical determinant in signalling of pro-σK processing in Bacillus subtilis. Mol. Microbiol. 36 (2000) 1336–1348. [DOI] [PMID: 10931284]
2.  Hoa, N.T., Brannigan, J.A. and Cutting, S.M. The PDZ domain of the SpoIVB serine peptidase facilitates multiple functions. J. Bacteriol. 183 (2001) 4364–4373. [DOI] [PMID: 11418578]
3.  Hoa, N.T., Brannigan, J.A. and Cutting, S.M. The Bacillus subtilis signaling protein SpoIVB defines a new family of serine peptidases. J. Bacteriol. 184 (2002) 191–199. [DOI] [PMID: 11741860]
4.  Dong, T.C. and Cutting, S.M. SpoIVB-mediated cleavage of SpoIVFA could provide the intercellular signal to activate processing of pro-σK in Bacillus subtilis. Mol. Microbiol. 49 (2003) 1425–1434. [DOI] [PMID: 12940997]
[EC created 2006]

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