>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=99.88 E-value=3.5e-19 Score=150.42 Aligned_cols=317 Identities=19% Similarity=0.207 Sum_probs=206.0 Q ss_pred HHCCCCEEEEEHHHHHHHHHHHHHHCCCCCCEEEEEEECCCCHHHHHHHHHCCC-CEEEECHHHHHHHHHCCCCCCCEEE Q ss_conf 974997899779999999999998614479789996410799999999997399-2898689998652212578431244 Q gi|254780371|r 23 HVVQTPFYCYSTTAIEKNYLTFSNAFDGMDTMVCYALKANSNQAVIKTLAHLGS-GLDIVSEGELRRALAAPVPAERIVF 101 (431) Q Consensus 23 ~~~gTP~yV~d~~~i~~n~~~l~~a~~~~~~~i~yAvKaN~~~~il~~l~~~G~-g~dv~S~~El~~al~~G~~~~~Ii~ 101 (431) T Consensus 5 ~~l~TPalvvD~~~l~~Ni~~m~~~~~~~~-~lRPH~KThKs~~ia~~Ql~~Ga~gi~vatl~EAe~~a~~G~~--dIli 81 (361) T cd06821 5 DEIISPALAVYPDRIEENIRRMIRMAGDPQ-RLRPHVKTHKMAEIVRLQLEAGITKFKCATIAEAEMLAEAGAP--DVLL 81 (361) T ss_pred HHCCCCEEEEEHHHHHHHHHHHHHHHCCCC-CEEEEEECCCCHHHHHHHHHCCCCCEEECCHHHHHHHHHCCCC--CEEE T ss_conf 658997399719999999999999623168-7778964117999999999779983796279999999975997--5899 Q ss_pred CCCCCCCHHHHHHH----HC-CCC-CCCCCCCHHHHHHHHHHCCCCCCEEEEEEEECCCCCCCCCCCCCCCCCCCCCCCC Q ss_conf 47754201244442----06-872-3333220246768774113344215899872377867443332233444568871 Q gi|254780371|r 102 SGVGKTIDEIDLAL----QS-GIY-CFNVESESELKTLNQRAVSLGKKAPIAFRVNPDINANTHKKISTGKKEDKFGIPI 175 (431) Q Consensus 102 ~g~~k~~~~l~~ai----~~-gv~-~i~vDs~~el~~l~~~a~~~~~~~~I~lRinp~~~~~~~~~~~tg~~~sKFGi~~ 175 (431) T Consensus 82 a~piv~~-k~~rl~~l~~~~~~~~i~v~VDs~~~~~~l~~~~~~~~~~~~V~ievD~G------------~--~R~Gv~~ 146 (361) T cd06821 82 AYPLVGP-NIERFLELAKKYPGTRFSALVDDLEAAEALSAAAGSAGLTLSVLLDVNTG------------M--NRTGIAP 146 (361) T ss_pred ECCCCCH-HHHHHHHHHHHCCCCEEEEEEECHHHHHHHHHHHHHCCCCEEEEEEECCC------------C--CCCCCCC T ss_conf 7577656-69999998753889779999708999999999998669960699997678------------8--8688888 Q ss_pred C-CCHHHHHHHHHCCCCCHHHHHHHHHH-CCCCC----HHHHHHHHHHHHHHHHHHCCCCCCCEEEECCCCCCCCCCCCC Q ss_conf 1-11345777641563220023355641-56442----048999999998876531026665268806873000266545 Q gi|254780371|r 176 H-QIHSLYAYASTLPGVKISGVDMHIGS-QIDQI----ESFHKAFKLLRDLTQQLRSNGHNIQHIDVGGGLGIAYHSDHR 249 (431) Q Consensus 176 ~-~~~~~~~~~~~~~~l~l~GlH~H~GS-~~~~~----~~~~~~~~~~~~~~~~l~~~g~~~~~ldiGGGf~i~y~~~~~ 249 (431) T Consensus 147 ~~~a~~La~~i~~~~~L~l~Gi~~y~Gh~~~~~~~~~~~~~~~~~~~~~~~~~~l~~~g~~~~~vs~Gg-Tpt------- 218 (361) T cd06821 147 GEDAEELYRAIATLPGLVLAGLHAYDGHHRNTDLAEREAAADAAYKPVLALREALEAAGLPVPELVAGG-TPS------- 218 (361) T ss_pred HHHHHHHHHHHHHCCCCEEEEEEEECCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCEEECCC-CCC------- T ss_conf 799999999998589983878986536345678799999999999999999999997499975140579-754------- Q ss_pred CCCHHHHHHHHHHHHCCCCCEEEEEECCEECCC--------------CCEEEEEEEEECCCCCCCCEEECCCCCCCCCCH Q ss_conf 531145655565421024530344101112036--------------632588876403468974220055300011001 Q gi|254780371|r 250 PPSSSDYASLIHQYFGNLQCKIILEPGRFLVAD--------------VGILVTKVISIKKSADKTFVILDVAMNDFMRPT 315 (431) Q Consensus 250 ~~~~~~~~~~i~~~~~~~~~~l~~EPGR~lva~--------------ag~ll~~V~~vK~~~~~~~~~vD~g~~~~~~p~ 315 (431) T Consensus 219 ---~~~~~~~---------~~~Ev~pG~yvf~D~~~~~~~~~~~~~~Al~Vla~ViS~---p~~~~~~vDaG~k~ls~D~ 283 (361) T cd06821 219 ---FPFHAAY---------TDVECSPGTFVLWDAGYGSKLPDLGFKPAALVVTRVISH---PTAGRVTLDLGHKAVASDP 283 (361) T ss_pred ---CCCCCCC---------CCEEECCCEEEECCCHHHHCCCCCCCCEEEEEEEEEEEE---CCCCEEEECCCCCCCCCCC T ss_conf ---0300037---------744753765898252344226675543226999999714---4899068777644003567 Q ss_pred HHCCCCCCCCCCCCCCCCCEEEEEEEEEECCCCCEEEEEEECCCCCCCCEEEEECCCCHHHHHHCCCCCCCCCEEEEEEC Q ss_conf 11024653222234677761589998100056666562100566888889999679702333402778898665999988 Q gi|254780371|r 316 LYDAYHEINYIVNPAGDRLHIHADIVGPICETGDFIALNRKIALPRPGDLLYIEKTGAYGAVQSGTYNSRLLIPEIMVNG 395 (431) Q Consensus 316 ~~~~~~~i~~~~~~~~~~~~~~~~i~G~~C~~~D~l~~~~~lp~l~~GD~l~i~~~GAY~~s~~s~fn~~p~p~~v~v~~ 395 (431) T Consensus 284 ----~~p~~~~~~---~~~---~~~~~~-s~EHg~l~~~-~~~~l~vGd~v~i~P~H~-C~----t~~~~~--~~~vv~~ 344 (361) T cd06821 284 ----PLPRVCLLG---LPD---AEPVGH-SEEHLVLETP-EAARPEIGDVLYGIPRHI-CP----TVALYD--EALVVRD 344 (361) T ss_pred ----CCCCCEECC---CCC---CEECCC-CCCEEEEECC-CCCCCCCCCEEEEECCCC-CH----HHHHCC--EEEEEEC T ss_conf ----998514607---998---568045-6866048889-888899999999973984-85----577178--7999999 Q ss_pred CEEE Q ss_conf 9689 Q gi|254780371|r 396 SQFH 399 (431) Q Consensus 396 g~~~ 399 (431) T Consensus 345 ~~vv 348 (361) T cd06821 345 GRIV 348 (361) T ss_pred CEEE T ss_conf 9999

HHsearch alignment for GI: 254780371 and conserved domain: cd06821