The SSHS domain is mainly found in Archaea. The domain makes up part of the anticodon binding domain at the C-terminal of O-phosphoserine--tRNA(Cys) ligase [1,2].

1: Toward understanding phosphoseryl-tRNACys formation: the crystal structure of Methanococcus maripaludis phosphoseryl-tRNA synthetase. Kamtekar S, Hohn MJ, Park HS, Schnitzbauer M, Sauerwald A, Soll D, Steitz TA; Proc Natl Acad Sci U S A. 2007;104:2620-2625. PMID:17301225

2: Structural insights into the first step of RNA-dependent cysteine biosynthesis in archaea. Fukunaga R, Yokoyama S; Nat Struct Mol Biol. 2007;14:272-279. PMID:17351629