>cd00384 ALAD_PBGS Porphobilinogen synthase (PBGS), which is also called delta-aminolevulinic acid dehydratase (ALAD), catalyzes the condensation of two 5-aminolevulinic acid (ALA) molecules to form the pyrrole porphobilinogen (PBG), which is the second step in the biosynthesis of tetrapyrroles, such as heme, vitamin B12 and chlorophyll. This reaction involves the formation of a Schiff base link between the substrate and the enzyme. PBGSs are metalloenzymes, some of which have a second, allosteric metal binding site, beside the metal ion binding site in their active site. Although PBGS is a family of homologous enzymes, its metal ion utilization at catalytic site varies between zinc and magnesium and/or potassium. PBGS can be classified into two groups based on differences in their active site metal binding site. They either contain a cysteine-rich zinc binding site (consensus DXCXCX(Y/F)X3G(H/Q)CG) or an aspartate-rich magnesium binding site (consensus DXALDX(Y/F)X3G(H/Q)DG). The cyste

Probab=100.00 E-value=0 Score=1092.21 Aligned_cols=314 Identities=52% Similarity=0.850 Sum_probs=311.0 Q ss_pred CCCCCCHHHHHHHHCCCCCHHHCCCCEEEECCCCCEEECCCCCCCCCCCHHHHHHHHHHHHHCCCCEEEEEECCCCCCCC Q ss_conf 63128988999863477888773311666758988110488878632889999999999998889367633025633455 Q gi|255764463|r 18 RRNRKSNWIREMVREHRLSVSDLILPIFLTSGEKTVESINSMPDVMRMSIDVAVEKIKQVADLGIPAIAIFPNIPMDLRN 97 (337) Q Consensus 18 RRlR~~~~iR~Lv~Et~Ls~~dLI~PiFV~eg~~~k~~I~SMPGv~R~Sid~L~~eie~~~~lGI~av~LFp~I~~~~Kd 97 (337) T Consensus 1 RRlR~~~~iR~Lv~Et~L~~~dLI~PiFV~eg~~~~~~I~SMPGi~R~sid~l~~~v~~~~~lGI~av~LFpv-p-~~Kd 78 (314) T cd00384 1 RRLRRSPALRDLVRETRLSPDDLIYPLFVVEGIDEKEEISSMPGVYRLSVDSLVEEAEELADLGIRAVILFGI-P-EHKD 78 (314) T ss_pred CCCCCCHHHHHHHHHCCCCHHHCEEEEEEECCCCCCEECCCCCCCEEECHHHHHHHHHHHHHCCCCEEEEECC-C-CCCC T ss_conf 9888877899998607888899762069945999840368999850328999999999999879988996389-8-8899 Q ss_pred CCCCCCCCCCCHHHHHHHHHHHHHCCCEEEECCCCCHHHCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHCCCCEEECCC Q ss_conf 44542157653799999999973014479861332710011431001365446289999999999999962897352466 Q gi|255764463|r 98 NTGSHIIDPDNLINEGICAIKKNIPNIGIITDVALDPFTIHGHDGILCDGEIVNDETIELISHAAVIQADAGADIIAPSE 177 (337) Q Consensus 98 ~~GseA~n~dglv~rAIr~IK~~fpdl~vi~DVcLc~YT~hGHcGi~~~g~IdND~Tl~~L~k~Al~~A~AGaDivAPSd 177 (337) T Consensus 79 ~~gseA~n~~glv~raIr~iK~~fpdl~vi~DVcL~pYT~hGHcGil~~g~IdND~Tv~~L~~~Al~~A~AGaDivAPSd 158 (314) T cd00384 79 EIGSEAYDPDGIVQRAIRAIKEAVPELVVITDVCLCEYTDHGHCGILKDDYVDNDATLELLAKIAVSHAEAGADIVAPSD 158 (314) T ss_pred CCCCCCCCCCCHHHHHHHHHHHHCCCCEEEEEECCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHCCCCCCCCCC T ss_conf 77553469865899999999997798689843033556687771447599582499999999999999974998145302 Q ss_pred CCCCHHHHHHHHHHHCCCCCCCEECHHHHHHHHHHCCHHHHHHCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHCCCCEE Q ss_conf 76779999999998778857730033666435430101675310244677774431572114788988887664089879 Q gi|255764463|r 178 MMDGRVQEIRKKLDSHGHINVGIMPYVAKFNSSFYGPYRDAISTRDLLKGDKKTYYLDPANVQEAIREASIDIQESADML 257 (337) Q Consensus 178 MMDGrV~aIR~~Ld~~g~~~~~ImsYsaKfaS~fYgPFRdA~~S~p~~~gdr~sYQmd~~n~~eA~~e~~~D~~EGAD~l 257 (337) T Consensus 159 MMDGrV~aIR~~Ld~~gf~~v~ImSYsaKyaS~fYGPFRdA~~S~~~~-gdrktYQmd~~n~~eAl~e~~~D~~EGAD~l 237 (314) T cd00384 159 MMDGRVAAIREALDEAGFSDVPIMSYSAKYASAFYGPFRDAADSAPSF-GDRKTYQMDPANRREALREVELDIEEGADIL 237 (314) T ss_pred CCCCHHHHHHHHHHHCCCCCCEEEEHHHHHHHCCCCHHHHHHHCCCCC-CCCCEEECCCCCHHHHHHHHHHHHHCCCCEE T ss_conf 557789999999997799988053227776340120478886157656-8844443599877999999985476199869 Q ss_pred EECCCHHHHHHHHHHHHHCCCCEEEEECCHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHHCCCEEEECHHHHHHHHH Q ss_conf 95531145899999996249989999346189999999988897889999999999977269999820189999998 Q gi|255764463|r 258 LVKPGLPYLDVCFRIKEKFGLPTFAYQVSGEYAMIKAASLQGWINKNDAMMESLLAFKRAGCDGIFTYFAMEAARIL 334 (337) Q Consensus 258 MVKPa~~yLDii~~~k~~~~~P~~aYqVSGEYami~~a~~~g~~d~~~~~~E~l~~~kRAGAd~IitY~A~~~a~~L 334 (337) T Consensus 238 MVKP~~~yLDii~~~k~~~~~P~~aYqVSGEYaMik~aa~~g~~d~~~~~~Esl~~~kRAGAd~IiTY~A~~~a~~L 314 (314) T cd00384 238 MVKPALAYLDIIRDVRERFDLPVAAYNVSGEYAMIKAAAKNGWIDEERVVLESLTSIKRAGADLIITYFAKDAARWL 314 (314) T ss_pred EECCCHHHHHHHHHHHHCCCCCEEEEECHHHHHHHHHHHHCCCCCHHHHHHHHHHHHHHCCCCEEEEECHHHHHHHC T ss_conf 85264168999999997059987999765999999999986997578899999999996499999871499998339

HHsearch alignment for GI: 255764463 and conserved domain: cd00384