This domain is found in a set of hypothetical Archaeal proteins. Its exact function has not, as yet, been defined. It possesses a zinc ribbon fold.

1: Biochemical and structural characterization of a novel family of cystathionine beta-synthase domain proteins fused to a Zn ribbon-like domain. Proudfoot M, Sanders SA, Singer A, Zhang R, Brown G, Binkowski A, Xu L, Lukin JA, Murzin AG, Joachimiak A, Arrowsmith CH, Edwards AM, Savchenko AV, Yakunin AF; J Mol Biol. 2008;375:301-315. PMID:18021800