This domain is found in the crystalline bacterial cell-surface layer (S-layer) protein SbsC present in Geobacillus stearothermophilus. S-layers are a common feature of archaeal cell envelopes. SbsC is an oblique lattice forming protein. This domain, termed Domain 9, is located at the C-terminal region of SbsC. The C-terminal region comprises the self-assembly domain responsible for the formation of the crystalline array [1].

1: Crystallization of domains involved in self-assembly of the S-layer protein SbsC. Ethordic A, Egelseer EM, Tesarz M, Sleytr UB, Keller W, Pavkov-Keller T; Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012;68:1511-1514. PMID:23192035