>cd06825 PLPDE_III_VanT Type III Pyridoxal 5-phosphate (PLP)-Dependent Enzymes, VanT and similar proteins. This subfamily is composed of Enterococcus gallinarum VanT and similar proteins. VanT is a membrane-bound serine racemase (EC 5.1.1.18) that is essential for vancomycin resistance in Enterococcus gallinarum. It converts L-serine into its D-enantiomer (D-serine) for peptidoglycan synthesis. The C-terminal region of this protein contains a PLP-binding TIM-barrel domain followed by beta-sandwich domain, which is homologous to the fold type III PLP-dependent enzyme, bacterial alanine racemase (AR). AR exists as homodimers with active sites that lie at the interface between the TIM barrel domain of one subunit and the beta-sandwich domain of the other subunit. On the basis of this similarity, it has been suggested that dimer formation of VanT is required for its catalytic activity, and that it catalyzes the racemization of serine in a mechanistically similar manner to that of alanine by

Probab=99.24 E-value=1e-10 Score=93.36 Aligned_cols=194 Identities=16% Similarity=0.196 Sum_probs=130.7 Q ss_pred HHHHHHHHHHHHHHHHHHCCCCHHHCEEEEECCC----CCHHHHHH-HHHCCCCCCCCCCCHHHHHHHHCCCCCCCCCEE Q ss_conf 8999999999999999981989644189987189----99999999-997298100012100011110000012587302 Q gi|254780801|r 3 LGNKLQVFKQKIENSAILAKRPKDSVSLVAVSKM----VDSKKIRV-ALSCGQVIFAENKLQEAKKKWIPLRKEWDVQLR 77 (222) Q Consensus 3 i~~nl~~i~~~I~~a~~~~gR~~~~v~LiaVtK~----~~~e~I~~-~~~~G~~~fGENrvQE~~~K~~~l~~~~~i~wH 77 (222) T Consensus 11 l~~N~~~i~~~~----------~~~~~i~aVVKAnAYGhG~~~va~~l~~~Gv~~f~Va~~~EA~~LR~~g~---~~~Il 77 (368) T cd06825 11 LEHNVKEIKRLL----------PSTCKLMAVVKANAYGHGDVEVARVLEQIGIDFFAVATIDEGIRLREAGI---KGEIL 77 (368) T ss_pred HHHHHHHHHHHC----------CCCCEEEEEEEECCCCCCHHHHHHHHHHCCCCEEEEEEHHHHHHHHHCCC---CCCEE T ss_conf 999999999747----------99987999995642668899999999986989999919999999996299---99989 Q ss_pred EECCCCCCHHHHHCCCCHHCCCCCCCCHHHHHHHHHHHHCCCEEEEEEEECCCCCCCCCCCCCHHHHHHHHHHCCCCCCH Q ss_conf 30244320013201110000122222001344333333114303688970046656346570001222344310431100 Q gi|254780801|r 78 FIGSLQSNKVSEIVSLFDVIETVSREKTASLLSLEMIKQSRFLPVYIQVNTGYEIQKSGIMPNQTKDFVILCRQKYQLNV 157 (222) Q Consensus 78 fIG~LQsNKvk~i~~~~~~Ihsvds~~~a~~L~~~~~~~~~~~~vliQVN~~~e~~K~G~~p~el~~l~~~i~~~~~L~i 157 (222) T Consensus 78 vl~~~~~~~~~~~~~-~~l~~~i~s~~~~~~l~~----~~~~~~vhLkiDTG--M~RlG~~~~e~~~~~~-~~~~~~l~~ 149 (368) T cd06825 78 ILGYTPPVRAKELKK-YSLTQTLISEAYAEELSK----YAVNIKVHLKVDTG--MHRLGESPEDIDSILA-IYRLKNLKV 149 (368) T ss_pred EECCCCHHHHHHHHH-CCCEEEECCHHHHHHHHH----CCCCCEEEEEECCC--CCCCCCCHHHHHHHHH-HHHCCCCCE T ss_conf 976998788999997-599899996999999972----79986079997079--9867888789999999-986799954 Q ss_pred HHHEEC-CCCCC--CC-----HHHHHHHHHHHHHC-----CCCEECCCCCHHHHHHHHHCCCEEEECHHHCCC Q ss_conf 111011-54334--52-----05899999998875-----894722477734899998089889971132389 Q gi|254780801|r 158 EGLMCI-PPAMG--NP-----KPHFYLLSEIAREC-----KLTKLSMGMTRDFELAIASGATSVRIGSGIFGE 217 (222) Q Consensus 158 ~GLMti-~p~~~--d~-----~~~F~~l~~l~~~~-----~~~~LSmGMS~D~~~Ai~~Gst~vRiGs~iFG~ 217 (222) T Consensus 150 ~gi~SH~a~AD~~~~~~~~~t~~Q~~~F~~~~~~l~~~~~~~~~~h~aNSagil~~p~~~~d~vRpGi~LYG~ 222 (368) T cd06825 150 SGIFSHLCVSDSLDEDDIAFTKHQIACFDQVLADLKARGIEVGKIHIQSSYGILNYPDLKYDYVRPGILLYGV 222 (368) T ss_pred EEEEEEECCCCCCCCCCHHHHHHHHHHHHHHHHHHHHCCCCCCEEEECCHHHHHCCCCCCCCEECCCEEEECC T ss_conf 7898530025668983358999999999999999987489845487427178763950248812673462678

HHsearch alignment for GI: 254780801 and conserved domain: cd06825