>cd02992 PDI_a_QSOX PDIa family, Quiescin-sulfhydryl oxidase (QSOX) subfamily; QSOX is a eukaryotic protein containing an N-terminal redox active TRX domain, similar to that of PDI, and a small C-terminal flavin adenine dinucleotide (FAD)-binding domain homologous to the yeast ERV1p protein. QSOX oxidizes thiol groups to disulfides like PDI, however, unlike PDI, this oxidation is accompanied by the reduction of oxygen to hydrogen peroxide. QSOX is localized in high concentrations in cells with heavy secretory load and prefers peptides and proteins as substrates, not monothiols like glutathione. Inside the cell, QSOX is found in the endoplasmic reticulum and Golgi. The flow of reducing equivalents in a QSOX-catalyzed reaction goes from the dithiol substrate - dithiol of the QSOX TRX domain - dithiols of the QSOX ERV1p domain - FAD - oxygen.

Probab=92.17  E-value=0.26  Score=28.74  Aligned_cols=44  Identities=11%  Similarity=0.163  Sum_probs=35.6

Q ss_pred             CCEEEEEEECCCCCCCCHHHHHHHHHHHHHHCCCCCCEEEEEEEE
Q ss_conf             967999960477765446888877655543024433305887651
Q gi|254780281|r   56 IKPSIVFFGFTNCSAVCPTTLSRLDRLLKQVDPTGTLLNAYFITV  100 (201)
Q Consensus        56 Gk~~li~F~~T~Cpd~Cp~~l~~l~~~~~~l~~~~~~v~~v~Isv  100 (201)
T Consensus        19 ~~~~lV~FYApWC~-hCk~l~P~~~~~A~~~~~~~~~v~~~~VdC   62 (114)
T cd02992          19 PSAWLVEFYASWCG-HCRAFAPTWKKLARDLRKWRPVVRVAAVDC   62 (114)
T ss_pred             CCCEEEEEECCCCH-HHHHCCHHHHHHHHHHHCCCCCEEEEEEEC
T ss_conf             97099999899783-154348699999998634388569999853