RPSBLAST alignment for GI: 254780968 and conserved domain: cd02976

>gnl|CDD|48525 cd02976, NrdH, NrdH-redoxin (NrdH) family; NrdH is a small monomeric protein with a conserved redox active CXXC motif within a TRX fold, characterized by a glutaredoxin (GRX)-like sequence and TRX-like activity profile. In vitro, it displays protein disulfide reductase activity that is dependent on TRX reductase, not glutathione (GSH). It is part of the NrdHIEF operon, where NrdEF codes for class Ib ribonucleotide reductase (RNR-Ib), an efficient enzyme at low oxygen levels. Under these conditions when GSH is mostly conjugated to spermidine, NrdH can still function and act as a hydrogen donor for RNR-Ib. It has been suggested that the NrdHEF system may be the oldest RNR reducing system, capable of functioning in a microaerophilic environment, where GSH was not yet available. NrdH from Corynebacterium ammoniagenes can form domain-swapped dimers, although it is unknown if this happens in vivo. Domain-swapped dimerization, which results in the blocking of the TRX reductase binding site, could be a mechanism for regulating the oxidation state of the protein.. Length = 73
 Score = 37.1 bits (86), Expect = 0.001
 Identities = 15/75 (20%), Positives = 34/75 (45%), Gaps = 7/75 (9%)

Query: 27  TSPRCGFSGKVVQVLDSLGVSYKGIDVLADDALRQSIKEYSNWPTIPQLYVKGDFIGGCD 86
           T P C +     + LD  G+ ++ +DV  D    + +K+ + + ++P + +  + + G  
Sbjct: 6   TKPDCPYCKATKRFLDERGIPFEEVDVDEDPEALEELKKLNGYRSVPVVVIGDEHLSG-- 63

Query: 87  IVCEMFESGELHEIL 101
                F   +L  +L
Sbjct: 64  -----FRPDKLRALL 73