>cd03018 PRX_AhpE_like Peroxiredoxin (PRX) family, AhpE-like subfamily; composed of proteins similar to Mycobacterium tuberculosis AhpE. AhpE is described as a 1-cys PRX because of the absence of a resolving cysteine. The structure and sequence of AhpE, however, show greater similarity to 2-cys PRXs than 1-cys PRXs. PRXs are thiol-specific antioxidant (TSA) proteins that confer a protective role in cells through their peroxidase activity in which hydrogen peroxide, peroxynitrate, and organic hydroperoxides are reduced and detoxified using reducing equivalents derived from either thioredoxin, glutathione, trypanothione and AhpF. The first step of catalysis is the nucleophilic attack by the peroxidatic cysteine on the peroxide leading to the formation of a cysteine sulfenic acid intermediate. The absence of a resolving cysteine suggests that functional AhpE is regenerated by an external reductant. The solution behavior and crystal structure of AhpE show that it forms dimers and octamers.

Probab=100.00 E-value=1.1e-36 Score=246.58 Aligned_cols=145 Identities=32% Similarity=0.493 Sum_probs=132.2 Q ss_pred CCCCCCCCCEEEECCCCCEEEHHHHCC-CEEEEEEEECCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC Q ss_conf 779865373078869997882898699-8599996511367663112610000000001233332223444321111222 Q gi|254780212|r 4 LSVGDKAPHFVLPSNDEQEISLLALGG-SKIVLYFYPKDDTSGCTAEAINFSSLKADFDEESTILIGISPDSIASHKKFH 82 (157) Q Consensus 4 l~vG~~aP~f~l~~~~g~~~~l~~l~g-k~vvl~f~~~~~tp~C~~e~~~l~~~~~~~~~~gv~vv~is~d~~~~~~~~~ 82 (157) T Consensus 1 l~vGd~aP~F~l~~~~g~~v~L~d~~g~~~vvl~F~p~~~cp~C~~e~~~~~~~~~~~~~~~v~Vv~IS~D~~~~~~~f~ 80 (149) T cd03018 1 LEVGDKAPDFELPDQNGQEVRLSEFRGRKPVVLVFFPLAFTPVCTKELCALRDSLELFEAAGAEVLGISVDSPFSLRAWA 80 (149) T ss_pred CCCCCCCCCEEEECCCCCEEEHHHHCCCCEEEEEEECCCCCCCCCHHHHHHHHHHHHHHCCCEEEEEECCCCHHHHHHHH T ss_conf 98979886979499998998689976998099999888899975878988888888763478399963699999999999 Q ss_pred CCCCCCCCCHHH--HHHHHHHHCCCCCCCCCCCCCCCCCCEEEEEECCCCEEEEEECCCC-CCCCHHHHHHHHHH Q ss_conf 210000000012--3445899859866665576654442107999889997999976888-57899999999998 Q gi|254780212|r 83 QKHNLSITLLAD--ESKEVLKSYDVWKEKSMFGKKYMGVVRTTFLIDEKGIIAQIWKPVT-LKNHAQSVLKMVKS 154 (157) Q Consensus 83 ~~~~~~fpil~D--~~~~~~~~~gv~~~~~~~~~~~~~~~r~tfiid~~G~I~~~~~~~~-~~~~~~eil~~i~~ 154 (157) T Consensus 81 ~~~~l~fpllsD~~~~~~va~~ygv~~~~~------g~~~r~tfiID~~G~V~~~~v~~~~~~r~~~~~~~~l~a 149 (149) T cd03018 81 EENGLTFPLLSDFWPHGEVAKAYGVFDEDL------GVAERAVFVIDRDGIIRYAWVSDDGEPRDLPDYDEALDA 149 (149) T ss_pred HHHCCCCEEEEECCCCCCHHHHCCCCCCCC------CCCCCEEEEECCCCEEEEEEEECCCCCCCHHHHHHHHCC T ss_conf 987999619996898702498869950677------984488999979998999999079967885799999659

HHsearch alignment for GI: 254780212 and conserved domain: cd03018