This family of bacterial protein C-terminal regions is highly conserved but the function is not known. Several members are annotated as being endo-1,4-beta-xylanase-like, but this could not be confirmed, and the structure can be defined as a heat-shock cognate 70kd protein 44kd ATPase.

1: The solution structure of antigen MPT64 from Mycobacterium tuberculosis defines a new family of beta-grasp proteins. Wang Z, Potter BM, Gray AM, Sacksteder KA, Geisbrecht BV, Laity JH; J Mol Biol. 2007;366:375-381. PMID:17174329