>TIGR00492 alr alanine racemase; InterPro: IPR000821 Alanine racemase catalyses the pyridoxal-dependent conversion of L-alanine into D-alanine, a key component of bacterial peptidoglycan . In Escherichia coli and Salmonella typhimurium, there are two alanine racemase isoforms, alr is a biosynthetic form required for cell wall formation; and dadB functions in L-alanine catabolism. By contrast with dadB and alr, both of which are monomeric enzymes, the alanine racemase of Bacillaceae are homodimers. In Pseudomonas putida, a broad-specificity amino acid racemase is structurally and functionally related to alanine racemase. The 3D-structure of the dimeric alanine racemase from Bacillus stearothermophilus has been determined to a resolution of 1.9 A . Each monomer comprises two domains, with an eight-stranded alpha/beta barrel at the N-terminus, and a C-terminal beta-strand domain. In the dimer, the mouth of the alpha/beta barrel of one monomer faces the second domain of the other monomer. The pyridoxal 5'-phosphate (PLP) cofactor lies in and above the barrel mouth and is covalently linked via an aldimine linkage to Lys39. Several other residues are involved in anchoring the PLP, for example, Arg219 forms a hydrogen bond with the pyridine nitrogen of the cofactor, which is assumed to influence electron delocalisation in PLP-alanine intermediates; Arg136 donates a hydrogen bond to the phenolic oxygen of PLP, and may be involved in substrate binding and stabilisation of intermediates; and Tyr265' is postulated to be a 2 proton donor to the carbanion intermediate .; GO: 0008784 alanine racemase activity, 0006522 alanine metabolic process.

Probab=98.70 E-value=3.8e-05 Score=53.48 Aligned_cols=297 Identities=13% Similarity=0.068 Sum_probs=175.1 Q ss_pred EEEEHHHHHHHHHHHHHHHHHCCCEEEEEEECCCC----HHHHHHHHHHC-CEEEEECHHHHHHHHC-CCCCCCEEECCC Q ss_conf 89779999999999999853369869995410599----99999998518-7489807999989873-688010885377 Q gi|254780741|r 7 YLIDKQKLLNNLDTALYIRKNAGVKLLLALKCFAA----WGMFDTLNQYM-DGTTSSSLYEVMLGHE-KFGGETHAYNVA 80 (367) Q Consensus 7 yv~d~~~i~~n~~~~~~~~~~~~~~i~yA~KaN~~----~~il~~l~~~g-~g~dv~S~~E~~la~~-g~~~~~i~~~~~ 80 (367) T Consensus 6 ~~id~~ALk~Nl~~~k~~~~-~~~~~~AVVKANAYGHG~~~~a~~~~~~Gad~lavA~LeEAi~LR~~G~~~PIL~Lg~~ 84 (383) T TIGR00492 6 VEIDLAALKHNLSAIKKQIG-PKSKIMAVVKANAYGHGLIEVAKTLLQAGADYLAVATLEEAIELRKAGITAPILLLGGF 84 (383) T ss_pred EEECHHHHHHHHHHHHHHCC-CCCEEEEEEECCCCCCCHHHHHHHHHHCCCCEEEECCHHHHHHHHHCCCCCCEEEEECC T ss_conf 99926789999999997468-87569999814842601899999998658966400024677998854788757885047 Q ss_pred CCHHHHHHHHCCCCEEEECCCHHHHHHHHHHHCCC--CCCEEEEEECCCCCCCCCCCCCCCCCCCCCCHH-HHHHHH--- Q ss_conf 78034788613886898567205999999861234--561489963577443101245578643574278-888743--- Q gi|254780741|r 81 YKDCEIDAVLSNCDTIIFNTVSQLNKFKDKAQKLH--KKIGLRINPSVSYSKFILADPNRPFSRLGEKCK-DKIESE--- 154 (367) Q Consensus 81 ~~~~el~~a~~~~~~i~iDs~~El~~i~~~a~~~~--~~I~lRinP~~~~~~~~~~~~~~~~skfG~~~~-~~~~~~--- 154 (367) T Consensus 85 ~~~~~~~~~~~~~l~~~v~s~Eql~~~~~~~lk~~sa~~l~vhlK~----------DTGM--~RLG~~~~f~~~~~~~~~ 152 (383) T TIGR00492 85 FSAEDLKILAAWDLTTTVHSVEQLKALEEALLKEPSAKRLKVHLKI----------DTGM--NRLGVKPDFEEALFVQKL 152 (383) T ss_pred CCHHHHHHHHHCCCEEEEECHHHHHHHHHHHHHCCCCCEEEEEEEE----------CCCC--CCCCCCCCHHHHHHHHHH T ss_conf 9988999998618638980889999999984104478747899862----------3888--647888657899999999 Q ss_pred ----H-CCCEEEEECCCCCCCCH--HHHHHHHHHHHHHHHHCCC-------CCEEEEECCCCCCCCCC----CCCHHHHH Q ss_conf ----1-49606653056566614--7899999999989865088-------75087533776664455----68078999 Q gi|254780741|r 155 ----I-KNVNGLMFHNNCENKSF--LCFSAMLKNIEKEFGHFIT-------QIEWISLGGGIHFTDKD----YPVKDFCQ 216 (367) Q Consensus 155 ----~-~~i~Gih~H~gs~~~~~--~~~~~~l~~~~~~~~~~~~-------~l~~idiGGG~~~~~~~----~~~~~~~~ 216 (367) T Consensus 153 ~~~~~~~~~~gi~sHfa-~AD~~~~~~~~~Q~~~F~~~~~~L~~~~i~~~~~~h~aNSaaiL~~~~~~enr~fd~vRpGI 231 (383) T TIGR00492 153 RALSKLLELEGIFSHFA-TADEPKTTTTKKQIERFLSFLEGLKQQKIELIPFRHIANSAAILSLPEGHENRLFDMVRPGI 231 (383) T ss_pred HHCCCCCCCCCEECCCC-CCCCCCHHHHHHHHHHHHHHHHHHHHCCCCCCCHHHHHHHHHHHCCCCCCCCCEEEEEECCH T ss_conf 83645643021121456-76772214799999999999851343686476335421017864453356664011442143 Q ss_pred HHHHHHHHCCCEEEEEHHHHCCCCCEEEEEEEEEEEC--CCCCCCCCCCCCCC------CCCCCCCCCCCCCCCCCCC-- Q ss_conf 9998754216504530022014574188878878630--44333433335656------5664001345530002478-- Q gi|254780741|r 217 RLKEFSEKYSVQIYLEPGEAIVTNTTTLNTTVLDISE--NIKNLVIVDSSVEA------HVPDYLLYQESATIYPNTG-- 286 (367) Q Consensus 217 ~i~~~~~~~~~~l~iEPGR~lv~~ag~lv~~V~~~K~--~~~~~v~vd~g~~~------~~~~~~~~~~~~~~~~~~~-- 286 (367) T Consensus 232 iLYG~~---Ps~~~~~~~~~~L~PVlsL~s~i~~vr~~k~Ger~VsYG~~~~a~~d~~iGvva~GYaDG~pR~l~n~~~V 308 (383) T TIGR00492 232 ILYGLY---PSADMKDGAPLGLKPVLSLKSKIIQVRTVKKGERPVSYGGTFTAEEDTKIGVVAIGYADGYPRALSNGTPV 308 (383) T ss_pred HHHCCC---CCHHCCCCCCCCCCCCEEEEEEEEEEEEECCCCCCCCCCEEEECCCCCEEEEEEECHHCCCHHHCCCCCEE T ss_conf 532147---62001455434750312678999998740588974246724865787368999620024752115898679 Q ss_pred ---CEEEEEECCCCCCCCEEEECC-CCCCCCCCCEEEEEC Q ss_conf ---645998623336664552135-667788798999968 Q gi|254780741|r 287 ---PYTAMVCGRSCLAGDIFGEFH-FEKPVKIGDRISFED 322 (367) Q Consensus 287 ---~~~~~v~G~~C~~~D~l~~~~-~~~~l~~GD~l~i~~ 322 (367) T Consensus 309 L~~G~~~~~~G~V~M--D~~~V~L~~~~~~k~G~~Vil~G 346 (383) T TIGR00492 309 LVNGKRVPIVGRVCM--DMLMVDLGPNLQAKTGDEVILWG 346 (383) T ss_pred EECCEEEEEEEEEEE--EEEEEECCCCCCCCCCCEEEEEE T ss_conf 886746314410141--00666238888898761689974

HHsearch alignment for GI: 254780741 and conserved domain: TIGR00492