>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=99.93 E-value=2.6e-22 Score=164.10 Aligned_cols=303 Identities=15% Similarity=0.155 Sum_probs=200.2 Q ss_pred CCEEEEEEHHHHHHHHHHHHHHCCC-CEEEEEEECCCCCCCHHHHHHHHHHCCCCEEEECCHHHHHHHHHHCCCCCEEEE Q ss_conf 8509998688999999999862899-759999932866579899999999879989998559999999983898526730 Q gi|254780333|r 5 EFLRLKIDLTALKNNWHSMNALSGN-ARTAAVVKDNAYGLGCEKIAPALYNAGVQDFFVTSVEEGVKLRLYTPQARIFVL 83 (370) Q Consensus 5 ~~~~leIdl~al~~Ni~~i~~~~~~-~~i~aVVKanAYGhG~~~va~~l~~~Gv~~faVa~~~EA~~lR~~g~~~~Ilvl 83 (370) T Consensus 8 ~TPalvvD~~~l~~Ni~~m~~~~~~~~~lRPH~KT----hKs~~ia~~Ql~~Ga~gi~vatl~EAe~~a~~G~~-dIlia 82 (361) T cd06821 8 ISPALAVYPDRIEENIRRMIRMAGDPQRLRPHVKT----HKMAEIVRLQLEAGITKFKCATIAEAEMLAEAGAP-DVLLA 82 (361) T ss_pred CCCEEEEEHHHHHHHHHHHHHHHCCCCCEEEEEEC----CCCHHHHHHHHHCCCCCEEECCHHHHHHHHHCCCC-CEEEE T ss_conf 99739971999999999999962316877789641----17999999999779983796279999999975997-58997 Q ss_pred CCCCHHHHHHHHH-------HHHHCCCCCHHHHHHHHHHH-HCCCCCCCEEEECCCCCCCCCCH-HHHHHHHHHHHHHHC Q ss_conf 6897469888875-------42101348998999988887-60887761676126667655698-899999988886310 Q gi|254780333|r 84 YGIHPGQEKIIFD-------TNLIPVISSVPQLTFYSKLM-SCGVSHPYALQVDTGFNRLGLSL-QEALDFTHNSFNKKL 154 (370) Q Consensus 84 ~~~~~~~~~~~~~-------~~i~~~i~s~~~l~~l~~~~-~~~~~~~vhlkiDTGM~R~G~~~-~e~~~~~~~~~~~~~ 154 (370) T Consensus 83 ~piv~~k~~rl~~l~~~~~~~~i~v~VDs~~~~~~l~~~~~~~~~~~~V~ievD~G~~R~Gv~~~~~a~~La~~i~~~~~ 162 (361) T cd06821 83 YPLVGPNIERFLELAKKYPGTRFSALVDDLEAAEALSAAAGSAGLTLSVLLDVNTGMNRTGIAPGEDAEELYRAIATLPG 162 (361) T ss_pred CCCCCHHHHHHHHHHHHCCCCEEEEEEECHHHHHHHHHHHHHCCCCEEEEEEECCCCCCCCCCCHHHHHHHHHHHHHCCC T ss_conf 57765669999998753889779999708999999999998669960699997678886888887999999999985899 Q ss_pred CCHHHHHCCCCCCCCCCC----HHHHHHHHHHHHHHHHHC--CCC---HHHCCCCHHCCCCCCCCHHHCCCCCCCCCCC- Q ss_conf 001243201243333466----788999999999975434--886---0111641100477322202048735306787- Q gi|254780333|r 155 GQLSLIISHLACADDPSS----HVNSVQLERFRTLISHYK--GIE---ASLASSSGILLGPNYHFQLTRPGISLYGGTD- 224 (370) Q Consensus 155 ~~i~gi~THfa~ad~~~~----~~~~~Q~~~F~~~~~~~~--~~~---~h~~nS~~~l~~p~~~~d~vR~Gi~lYG~~~- 224 (370) T Consensus 163 L~l~Gi~~y~Gh~~~~~~~~~~~~~~~~~~~~~~~~~~l~~~g~~~~~vs~GgTpt~~~~~~~~~~Ev~pG~yvf~D~~~ 242 (361) T cd06821 163 LVLAGLHAYDGHHRNTDLAEREAAADAAYKPVLALREALEAAGLPVPELVAGGTPSFPFHAAYTDVECSPGTFVLWDAGY 242 (361) T ss_pred CEEEEEEEECCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCEEECCCCCCCCCCCCCCCEEECCCEEEECCCHH T ss_conf 83878986536345678799999999999999999999997499975140579754030003774475376589825234 Q ss_pred -CCCCCCCCCCEEEEEEEEEEEEEECCCCCC-CCCCCCCCCCCCEEEEECCCCCCCEECCCCCCCCCCCCCCCCCCEEEE Q ss_conf -767556764100123688632671489834-665653467764179712330026010236854334443232886999 Q gi|254780333|r 225 -KINKSHPMQTVVTAEARIILIRKALAGELV-SYGGQKKLTRDSLIAVAAIGYADGYPLTLSGLDSEHSPSVFLGGKGFI 302 (370) Q Consensus 225 -~~~~~~~l~pv~~l~s~i~~ir~l~~G~~V-gYg~~~~~~~~~~iavipiGYaDG~pr~ls~~~~~~~~~~~~~~~vli 302 (370) T Consensus 243 ~~~~~~~~~~~Al~Vla~ViS~--p~~~~~~vDaG~-k~ls~D~~---~p~~~~~~~~---------------------- 294 (361) T cd06821 243 GSKLPDLGFKPAALVVTRVISH--PTAGRVTLDLGH-KAVASDPP---LPRVCLLGLP---------------------- 294 (361) T ss_pred HHCCCCCCCCEEEEEEEEEEEE--CCCCEEEECCCC-CCCCCCCC---CCCCEECCCC---------------------- T ss_conf 4226675543226999999714--489906877764-40035679---9851460799---------------------- Q ss_pred CCEEEEEEEECCCCCEEEECCCCCCCCCCCEEEEECCC--CCHH Q ss_conf 99995077004256479966887787888789997888--8998 Q gi|254780333|r 303 KGYMVPILGKITMDMTMFDITDSLSIEVGDYIQIFGPD--IKLD 344 (370) Q Consensus 303 ~G~~~pivGrv~MD~~~vdvt~~~~~~~GD~V~l~G~~--i~~~ 344 (370) T Consensus 295 ---~~~~~-~~s~EHg~l~~~~~~~l~vGd~v~i~P~H~C~t~~ 334 (361) T cd06821 295 ---DAEPV-GHSEEHLVLETPEAARPEIGDVLYGIPRHICPTVA 334 (361) T ss_pred ---CCEEC-CCCCCEEEEECCCCCCCCCCCEEEEECCCCCHHHH T ss_conf ---85680-45686604888988889999999997398485577

HHsearch alignment for GI: 254780333 and conserved domain: cd06821