>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=99.35 E-value=1.5e-09 Score=85.01 Aligned_cols=317 Identities=15% Similarity=0.168 Sum_probs=207.4 Q ss_pred EEEEEHHHHHHHHHHHHHHCCCCCCEEEEEEECCC----CHHHHHHHHHCCC-CEEEECHHHHHHHHHCCCCCCCEEECC Q ss_conf 89977999999999999861447978999641079----9999999997399-289868999865221257843124447 Q gi|254780371|r 29 FYCYSTTAIEKNYLTFSNAFDGMDTMVCYALKANS----NQAVIKTLAHLGS-GLDIVSEGELRRALAAPVPAERIVFSG 103 (431) Q Consensus 29 ~yV~d~~~i~~n~~~l~~a~~~~~~~i~yAvKaN~----~~~il~~l~~~G~-g~dv~S~~El~~al~~G~~~~~Ii~~g 103 (431) T Consensus 5 ~~~id~~ALk~Nl~~~k~~~~-~~~~~~AVVKANAYGHG~~~~a~~~~~~Gad~lavA~LeEAi~LR~~G~~~-PIL~Lg 82 (383) T TIGR00492 5 WVEIDLAALKHNLSAIKKQIG-PKSKIMAVVKANAYGHGLIEVAKTLLQAGADYLAVATLEEAIELRKAGITA-PILLLG 82 (383) T ss_pred EEEECHHHHHHHHHHHHHHCC-CCCEEEEEEECCCCCCCHHHHHHHHHHCCCCEEEECCHHHHHHHHHCCCCC-CEEEEE T ss_conf 899926789999999997468-875699998148426018999999986589664000246779988547887-578850 Q ss_pred CCCCCHHHHHHHHCCCCCCCCCCCHHHHHHHHHHCCCC--CCEEEEEEEECCCCCCCCCCCCCCCCCCCCCCCCC-CCHH Q ss_conf 75420124444206872333322024676877411334--42158998723778674433322334445688711-1134 Q gi|254780371|r 104 VGKTIDEIDLALQSGIYCFNVESESELKTLNQRAVSLG--KKAPIAFRVNPDINANTHKKISTGKKEDKFGIPIH-QIHS 180 (431) Q Consensus 104 ~~k~~~~l~~ai~~gv~~i~vDs~~el~~l~~~a~~~~--~~~~I~lRinp~~~~~~~~~~~tg~~~sKFGi~~~-~~~~ 180 (431) T Consensus 83 ~~~~~~~~~~~~~~~l~-~~v~s~Eql~~~~~~~lk~~sa~~l~vhlK~------------DTGM--~RLG~~~~f~~~~ 147 (383) T TIGR00492 83 GFFSAEDLKILAAWDLT-TTVHSVEQLKALEEALLKEPSAKRLKVHLKI------------DTGM--NRLGVKPDFEEAL 147 (383) T ss_pred CCCCHHHHHHHHHCCCE-EEEECHHHHHHHHHHHHHCCCCCEEEEEEEE------------CCCC--CCCCCCCCHHHHH T ss_conf 47998899999861863-8980889999999984104478747899862------------3888--6478886578999 Q ss_pred HHHHHHHCCCCC-HHHHHHHHHHCCCCCH--HHHHHHHHHHHHHHHHHCCCCC----CCEEEECCCCCCCCCCCCCCCCH Q ss_conf 577764156322-0023355641564420--4899999999887653102666----52688068730002665455311 Q gi|254780371|r 181 LYAYASTLPGVK-ISGVDMHIGSQIDQIE--SFHKAFKLLRDLTQQLRSNGHN----IQHIDVGGGLGIAYHSDHRPPSS 253 (431) Q Consensus 181 ~~~~~~~~~~l~-l~GlH~H~GS~~~~~~--~~~~~~~~~~~~~~~l~~~g~~----~~~ldiGGGf~i~y~~~~~~~~~ 253 (431) T Consensus 148 ~~~~~~~~~~~~~~~gi~sHfa-~AD~~~~~~~~~Q~~~F~~~~~~L~~~~i~~~~~~h~aNSaaiL~~~~~~enr~fd~ 226 (383) T TIGR00492 148 FVQKLRALSKLLELEGIFSHFA-TADEPKTTTTKKQIERFLSFLEGLKQQKIELIPFRHIANSAAILSLPEGHENRLFDM 226 (383) T ss_pred HHHHHHHCCCCCCCCCEECCCC-CCCCCCHHHHHHHHHHHHHHHHHHHHCCCCCCCHHHHHHHHHHHCCCCCCCCCEEEE T ss_conf 9999983645643021121456-767722147999999999998513436864763354210178644533566640114 Q ss_pred HHHHHHHHHHHCCCCCEEEEEECCEECCCCCEEEEEEEEECCCC-CC-------CCEEECCCCCCCCCCHHHCCCCCCCC Q ss_conf 45655565421024530344101112036632588876403468-97-------42200553000110011102465322 Q gi|254780371|r 254 SDYASLIHQYFGNLQCKIILEPGRFLVADVGILVTKVISIKKSA-DK-------TFVILDVAMNDFMRPTLYDAYHEINY 325 (431) Q Consensus 254 ~~~~~~i~~~~~~~~~~l~~EPGR~lva~ag~ll~~V~~vK~~~-~~-------~~~~vD~g~~~~~~p~~~~~~~~i~~ 325 (431) T Consensus 227 vRpGIiLYG~~Ps~~---~~~~~~~~L~PVlsL~s~i~~vr~~k~Ger~VsYG~~~~a~~-d~~iGvva~GYaDG~pR-~ 301 (383) T TIGR00492 227 VRPGIILYGLYPSAD---MKDGAPLGLKPVLSLKSKIIQVRTVKKGERPVSYGGTFTAEE-DTKIGVVAIGYADGYPR-A 301 (383) T ss_pred EECCHHHHCCCCCHH---CCCCCCCCCCCCEEEEEEEEEEEEECCCCCCCCCCEEEECCC-CCEEEEEEECHHCCCHH-H T ss_conf 421435321476200---145543475031267899999874058897424672486578-73689996200247521-1 Q ss_pred CCCCCC-CCCEEEEEEEEEECCCCCEEEEEEE-CCCCCCCCEEEEEC Q ss_conf 223467-7761589998100056666562100-56688888999967 Q gi|254780371|r 326 IVNPAG-DRLHIHADIVGPICETGDFIALNRK-IALPRPGDLLYIEK 370 (431) Q Consensus 326 ~~~~~~-~~~~~~~~i~G~~C~~~D~l~~~~~-lp~l~~GD~l~i~~ 370 (431) T Consensus 302 l~n~~~VL~~G~~~~~~G~V~M--D~~~V~L~~~~~~k~G~~Vil~G 346 (383) T TIGR00492 302 LSNGTPVLVNGKRVPIVGRVCM--DMLMVDLGPNLQAKTGDEVILWG 346 (383) T ss_pred CCCCCEEEECCEEEEEEEEEEE--EEEEEECCCCCCCCCCCEEEEEE T ss_conf 5898679886746314410141--00666238888898761689974

HHsearch alignment for GI: 254780371 and conserved domain: TIGR00492