This is the SPOCS domain found in three copies in SipL from C. difficile, N-terminal to the LysM domain (Pfam:PF01476) [1]. SipL (for SpoIVA-interacting protein) is involved in coat localization, and, together with SpoIVA, is a critical spore morphogenetic protein [2].

1: Bacterial developmental checkpoint that directly monitors cell surface morphogenesis. Delerue T, Anantharaman V, Gilmore MC, Popham DL, Cava F, Aravind L, Ramamurthi KS; Dev Cell. 2022;57:344-360. PMID:35065768

2: SpoIVA and SipL are Clostridium difficile spore morphogenetic proteins. Putnam EE, Nock AM, Lawley TD, Shen A; J Bacteriol. 2013;195:1214-1225. PMID:23292781