>TIGR02181 GRX_bact glutaredoxin 3; InterPro: IPR011900 Glutaredoxins , , , also known as thioltransferases (disulphide reductases, are small proteins of approximately one hundred amino-acid residues which utilise glutathione and NADPH as cofactors. Oxidized glutathione is regenerated by glutathione reductase. Together these components compose the glutathione system . Glutaredoxin functions as an electron carrier in the glutathione-dependent synthesis of deoxyribonucleotides by the enzyme ribonucleotide reductase. Like thioredoxin, which functions in a similar way, glutaredoxin possesses an active centre disulphide bond . It exists in either a reduced or an oxidized form where the two cysteine residues are linked in an intramolecular disulphide bond. Glutaredoxin has been sequenced in a variety of species. On the basis of extensive sequence similarity, it has been proposed that Vaccinia virus protein O2L is most probably a glutaredoxin. Finally, it must be noted that Bacteriophage T4 thioredoxin seems also to be evolutionary related. In position 5 of the pattern T4 thioredoxin has Val instead of Pro. This family of glutaredoxins includes the E. coli protein GrxC (Grx3) which appears to have a secondary role in reducing ribonucleotide reductase (in the absence of GrxA) possibly indicating a role in the reduction of other protein disulphides .; GO: 0006118 electron transport, 0045454 cell redox homeostasis.

Probab=97.41  E-value=0.00018  Score=44.90  Aligned_cols=67  Identities=15%  Similarity=0.083  Sum_probs=53.1

Q ss_pred             CCCCCCCCCHHHHHHHHHHHHCCC-CEEEEECCCCC-C-CHHHHHHC-CCCCCCHHHHCCHHHHCCCCHHHH
Q ss_conf             521358998689999999998699-82999888677-7-88999855-687752011100011101210356
Q gi|254780594|r    2 SILYHYPLSSSSRFIRLILSEYEF-TTDMIEEFPWG-K-RREFLELN-PSGTLPVYIDEHMQALCGVFVISE   69 (230)
Q Consensus         2 ~~LY~~~~sp~~~kvr~~L~e~gi-~y~~~~~~~~~-~-~~~~~~ln-P~g~vP~L~~~dg~~l~eS~aI~~   69 (230)
T Consensus         1 V~iYT~~~CPYC~rAK~LL~~kGv~~~~Ei~vd~dpD~~r~eM~~Rs~Gr~TVPQIFIg~-~HVGGcDDL~~   71 (82)
T TIGR02181         1 VTIYTKPYCPYCSRAKALLESKGVGTFTEIRVDGDPDALRDEMMQRSGGRRTVPQIFIGD-VHVGGCDDLYA   71 (82)
T ss_pred             CEEECCCCCCCCHHHHHHHHHCCCCCCEEEECCCCCCHHHHHHHHHHCCCCCCCEEEECC-CCCCCCHHHHH
T ss_conf             946315998802688999985698863034457981068899999828994043376299-02454379999