>cd03015 PRX_Typ2cys Peroxiredoxin (PRX) family, Typical 2-Cys PRX subfamily; PRXs are thiol-specific antioxidant (TSA) proteins, which confer a protective role in cells through its peroxidase activity by reducing hydrogen peroxide, peroxynitrite, and organic hydroperoxides. The functional unit of typical 2-cys PRX is a homodimer. A unique intermolecular redox-active disulfide center is utilized for its activity. Upon reaction with peroxides, its peroxidatic cysteine is oxidized into a sulfenic acid intermediate which is resolved by bonding with the resolving cysteine from the other subunit of the homodimer. This intermolecular disulfide bond is then reduced by thioredoxin, tryparedoxin or AhpF. Typical 2-cys PRXs, like 1-cys PRXs, form decamers which are stabilized by reduction of the active site cysteine. Typical 2-cys PRX interacts through beta strands at one edge of the monomer (B-type interface) to form the functional homodimer, and uses an A-type interface (similar to the dimeric

Probab=99.97 E-value=3.1e-31 Score=188.28 Aligned_cols=145 Identities=25% Similarity=0.352 Sum_probs=118.7 Q ss_pred ECCCCCCCCCC----CC-CCCEEHHHHHCCCEEEEEEECCCCCCCCCHHHCHHHHHHHHHHHHHCCCEEEEEECCCCHHH Q ss_conf 36706884036----88-84023589838974999982288787410010104653112455310110234303540113 Q gi|254780311|r 15 VATVLPDGSKA----FQ-WKDVNTQDLFAGKRVFLFALPGAFTPTCSDHQLPGFEKIYDDLRCEGIEEVYCLSVNDAFVM 89 (177) Q Consensus 15 vGd~~Pd~tl~----~~-~~~~~~~d~f~gKkVvL~~~P~AfTp~Ct~~~~~~~~~~~~~~~~~~~~~i~~~s~~d~~~~ 89 (177) T Consensus 1 vGd~aP~F~l~~~~~~~~~~~v~lsd~-~Gk~vvL~FyP~dfTp~Ct~E~-~~f~~~~~ef~~~g~-~vigIS~Ds~~sh 77 (173) T cd03015 1 VGKKAPDFKATAVVPNGEFKEISLSDY-KGKWVVLFFYPLDFTFVCPTEI-IAFSDRYEEFKKLNA-EVLGVSTDSHFSH 77 (173) T ss_pred CCCCCCCCEEECCCCCCCCCEEEHHHH-CCCEEEEEEECCCCCCCCHHHH-HHHHHHHHHHHHCCC-EEEEECCCCHHHH T ss_conf 958689876024228987408768996-8982999998178995227999-999999999984696-7998607988999 Q ss_pred HHHHCCC------CCCEEEEEECCCHHHHHHHHCCCCCCCCCCCEEEEEEEEEEC-CCEEEEEEECCCCCCCCCCCCCCC Q ss_conf 6652235------875278610367154333200224765434410015999987-996999997488777877777324 Q gi|254780311|r 90 NAWGKKL------EIKNVKLLPDGSGEFTRKMGMLVYKDNVGFGLRSWRYGALIK-DMVVESWFVEEGFSDNCATDPYEI 162 (177) Q Consensus 90 ~aw~~~~------~~~~~~~l~D~~~~~~~~~g~~~~~~~~g~g~rs~R~a~Ii~-dG~I~~~~~E~~~~~~~~~d~~~v 162 (177) T Consensus 78 ~~~~~~~~~~~~~~~l~fplLsD~~~~v~~~yGv~~~~--~g~---~~R~tfiID~~g~Ir~~~~~~~~~g--------- 143 (173) T cd03015 78 LAWRNTPRKEGGLGKINFPLLADPKKKISRDYGVLDEE--EGV---ALRGTFIIDPEGIIRHITVNDLPVG--------- 143 (173) T ss_pred HHHHHHHHHHCCCCCCCCCEEECCHHHHHHHHCCCCCC--CCC---CCEEEEEECCCCEEEEEEECCCCCC--------- T ss_conf 99987689756877644676777636999981997565--687---7517999899986999997389989--------- Q ss_pred CCHHHHHHHHHHHC Q ss_conf 89999999998616 Q gi|254780311|r 163 SSPENVLKVIRESK 176 (177) Q Consensus 163 s~ae~iL~~Lk~~~ 176 (177) T Consensus 144 r~~~EiLr~l~aLq 157 (173) T cd03015 144 RSVDETLRVLDALQ 157 (173) T ss_pred CCHHHHHHHHHHHH T ss_conf 89999999999862

HHsearch alignment for GI: 254780311 and conserved domain: cd03015