This small triple helical domain has been predicted to assume a topology similar to helix-turn-helix domains. These domains are found at the C-terminus of proteins related to Swiss:P32157 [1,2].

1: MOSC domains: ancient, predicted sulfur-carrier domains, present in diverse metal--sulfur cluster biosynthesis proteins including Molybdenum cofactor sulfurases. Anantharaman V, Aravind L; FEMS Microbiol Lett 2002;207:55-61. PMID:11886751

2: Crystal structure of the hydroxylaminopurine resistance protein, YiiM, and its putative molybdenum cofactor-binding catalytic site. Namgung B, Kim JH, Song WS, Yoon SI; Sci Rep. 2018;8:3304. PMID:29459651