>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=94.85  E-value=0.032  Score=34.04  Aligned_cols=25  Identities=28%  Similarity=0.413  Sum_probs=20.5

Q ss_pred             CEEEEEEECCCCCCHHHHHHHHHHH
Q ss_conf             8899997058882064433421134
Q gi|254780477|r   66 PVTMVEYASMTCFHCAEFHNKTFKY   90 (232)
Q Consensus        66 ~v~ivef~D~~Cp~C~~~~~~~~~~   90 (232)
T Consensus        20 ~~~lV~FYApWC~hCk~l~P~~~~~   44 (114)
T cd02992          20 SAWLVEFYASWCGHCRAFAPTWKKL   44 (114)
T ss_pred             CCEEEEEECCCCHHHHHCCHHHHHH
T ss_conf             7099999899783154348699999