This is the C-terminal interdomain (ID) or oligonucleotide binding (OB) domain of proteasomal ATPase [1-2]

1: Structural insights on the Mycobacterium tuberculosis proteasomal ATPase Mpa. Wang T, Li H, Lin G, Tang C, Li D, Nathan C, Darwin KH, Li H; Structure. 2009;17:1377-1385. PMID:19836337

2: Binding-induced folding of prokaryotic ubiquitin-like protein on the Mycobacterium proteasomal ATPase targets substrates for degradation. Wang T, Darwin KH, Li H; Nat Struct Mol Biol. 2010;17:1352-1357. PMID:20953180