>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, cou

Probab=98.09  E-value=3.4e-06  Score=54.86  Aligned_cols=63  Identities=17%  Similarity=0.182  Sum_probs=50.4

Q ss_pred             CCCCCCCCCCHHHHHHHHHHHHCCCCEEEEECCCCC-CCHHHHHHCCCCCCCHHHHCCHHHHCCC
Q ss_conf             952135899868999999999869982999888677-7889998556877520111000111012
Q gi|254780594|r    1 MSILYHYPLSSSSRFIRLILSEYEFTTDMIEEFPWG-KRREFLELNPSGTLPVYIDEHMQALCGV   64 (230)
Q Consensus         1 M~~LY~~~~sp~~~kvr~~L~e~gi~y~~~~~~~~~-~~~~~~~lnP~g~vP~L~~~dg~~l~eS   64 (230)
T Consensus         1 kI~iYt~~~C~~C~~ak~~L~~~gi~y~~~di~~d~~~~~~l~~~~g~~~vP~i~i~~-~~i~Gf   64 (73)
T cd02976           1 EVTVYTKPDCPYCKATKRFLDERGIPFEEVDVDEDPEALEELKKLNGYRSVPVVVIGD-EHLSGF   64 (73)
T ss_pred             CEEEECCCCCHHHHHHHHHHHHCCCEEEEEECCCCHHHHHHHHHHCCCCCCCEEEECC-EEEECC
T ss_conf             9999918999779999999998399049998799999999999865999618899999-999387