>cd06821 PLPDE_III_D-TA Type III Pyridoxal 5-phosphate (PLP)-Dependent Enzyme D-Threonine Aldolase. D-threonine aldolase (D-TA, EC 4.3.1.18) reversibly catalyzes the aldol cleavage of D-threonine into glycine and acetaldehyde, and the synthesis of D-threonine from glycine and acetaldehyde. Its activity is present in several genera of bacteria but not in fungi. It requires PLP and a divalent cation such as Co2+, Ni2+, Mn2+, or Mg2+ as cofactors for catalytic activity and thermal stability. Members of this subfamily show similarity to bacterial alanine racemase (AR), a fold type III PLP-dependent enzyme which contains an N-terminal PLP-binding TIM-barrel domain and a C-terminal beta-sandwich domain. 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. Based on its similarity to AR, it is possible that low specificity D-TAs also form dimers in solution. Experimental data show that

Probab=99.14 E-value=4.6e-10 Score=89.02 Aligned_cols=205 Identities=18% Similarity=0.176 Sum_probs=144.5 Q ss_pred HHHHHHHHHHHHHHCCCCHHHCEEEEECCCCCHHHHH-HHHHCCCCCCCCCCCHHHHHHHHCCCCCCCCCEEEECCCCCC Q ss_conf 9999999999999819896441899871899999999-999729810001210001111000001258730230244320 Q gi|254780801|r 7 LQVFKQKIENSAILAKRPKDSVSLVAVSKMVDSKKIR-VALSCGQVIFAENKLQEAKKKWIPLRKEWDVQLRFIGSLQSN 85 (222) Q Consensus 7 l~~i~~~I~~a~~~~gR~~~~v~LiaVtK~~~~e~I~-~~~~~G~~~fGENrvQE~~~K~~~l~~~~~i~wHfIG~LQsN 85 (222) T Consensus 16 ~~~l~~Ni~~m~~~~~~~--~-~lRPH~KThKs~~ia~~Ql~~Ga~gi~vatl~EAe~~a~~--G~~dIl--ia~piv~~ 88 (361) T cd06821 16 PDRIEENIRRMIRMAGDP--Q-RLRPHVKTHKMAEIVRLQLEAGITKFKCATIAEAEMLAEA--GAPDVL--LAYPLVGP 88 (361) T ss_pred HHHHHHHHHHHHHHHCCC--C-CEEEEEECCCCHHHHHHHHHCCCCCEEECCHHHHHHHHHC--CCCCEE--EECCCCCH T ss_conf 999999999999962316--8-7778964117999999999779983796279999999975--997589--97577656 Q ss_pred HHHHHCCCC------HHCCCCCCCCHHHHHHHHHHHHCCCEEEEEEEECCCCCCCCCCCCC-HHHHHHHHHHCCCCCCHH Q ss_conf 013201110------0001222220013443333331143036889700466563465700-012223443104311001 Q gi|254780801|r 86 KVSEIVSLF------DVIETVSREKTASLLSLEMIKQSRFLPVYIQVNTGYEIQKSGIMPN-QTKDFVILCRQKYQLNVE 158 (222) Q Consensus 86 Kvk~i~~~~------~~Ihsvds~~~a~~L~~~~~~~~~~~~vliQVN~~~e~~K~G~~p~-el~~l~~~i~~~~~L~i~ 158 (222) T Consensus 89 k~~rl~~l~~~~~~~~i~v~VDs~~~~~~l~~~~~~~~~~~~V~ievD~G--~~R~Gv~~~~~a~~La~~i~~~~~L~l~ 166 (361) T cd06821 89 NIERFLELAKKYPGTRFSALVDDLEAAEALSAAAGSAGLTLSVLLDVNTG--MNRTGIAPGEDAEELYRAIATLPGLVLA 166 (361) T ss_pred HHHHHHHHHHHCCCCEEEEEEECHHHHHHHHHHHHHCCCCEEEEEEECCC--CCCCCCCCHHHHHHHHHHHHHCCCCEEE T ss_conf 69999998753889779999708999999999998669960699997678--8868888879999999999858998387 Q ss_pred HHEECCCCCC--CC-------HHHHHHHHHHHHHC-----CCCEECCCCCHHHHHHHHHCCCEEEECHHHCCCCCC Q ss_conf 1101154334--52-------05899999998875-----894722477734899998089889971132389999 Q gi|254780801|r 159 GLMCIPPAMG--NP-------KPHFYLLSEIAREC-----KLTKLSMGMTRDFELAIASGATSVRIGSGIFGERPC 220 (222) Q Consensus 159 GLMti~p~~~--d~-------~~~F~~l~~l~~~~-----~~~~LSmGMS~D~~~Ai~~Gst~vRiGs~iFG~R~~ 220 (222) T Consensus 167 Gi~~y~Gh~~~~~~~~~~~~~~~~~~~~~~~~~~l~~~g~~~~~vs~GgTpt~~~~~~~~~~Ev~pG~yvf~D~~~ 242 (361) T cd06821 167 GLHAYDGHHRNTDLAEREAAADAAYKPVLALREALEAAGLPVPELVAGGTPSFPFHAAYTDVECSPGTFVLWDAGY 242 (361) T ss_pred EEEEECCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCEEECCCCCCCCCCCCCCCEEECCCEEEECCCHH T ss_conf 8986536345678799999999999999999999997499975140579754030003774475376589825234

HHsearch alignment for GI: 254780801 and conserved domain: cd06821