>cd06817 PLPDE_III_DSD Type III Pyridoxal 5-phosphate (PLP)-Dependent Enzyme Eukaryotic D-Serine Dehydratase. This subfamily is composed of chicken D-serine dehydratase (DSD, EC 4.3.1.18) and similar eukaryotic proteins. Chicken DSD catalyzes the dehydration of D-serine to aminoacrylate, which is rapidly hydrolyzed to pyruvate and ammonia. It is a fold type III PLP-dependent enzyme with similarity to bacterial alanine racemase (AR), which contains an N-terminal PLP-binding TIM-barrel domain and a C-terminal beta-sandwich domain. AR exists as dimers 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. Experimental data suggest that chicken DSD also exists as dimers. Sequence comparison and biochemical experiments show that chicken DSD is distinct from the ubiquitous bacterial DSDs coded by dsdA gene, mammalian L-serine dehydratases (LSD) and mammalian serine racemase (SerRac), which are fold type II PL

Probab=98.54 E-value=5.8e-07 Score=68.16 Aligned_cols=209 Identities=17% Similarity=0.153 Sum_probs=130.0 Q ss_pred HHHHHHHHHHHHHHCCCCHHHCEEEEECCCCCHHHHH-HHHHCC--CCCCCCCCCHHHHHHHHCCCCCCCCCEEEE-CCC Q ss_conf 9999999999999819896441899871899999999-999729--810001210001111000001258730230-244 Q gi|254780801|r 7 LQVFKQKIENSAILAKRPKDSVSLVAVSKMVDSKKIR-VALSCG--QVIFAENKLQEAKKKWIPLRKEWDVQLRFI-GSL 82 (222) Q Consensus 7 l~~i~~~I~~a~~~~gR~~~~v~LiaVtK~~~~e~I~-~~~~~G--~~~fGENrvQE~~~K~~~l~~~~~i~wHfI-G~L 82 (222) T Consensus 13 ~~~l~~Ni~~M~~~~~--~~gv~lRPH~KTHKs~~ia~~Ql~aG~~a~git~atv~EAe~~a~~G~~~-~~~dil~a~pv 89 (389) T cd06817 13 RAKFKRNCERMLQRAK--ALGVKFRPHVKTHKTLEGTRLQLGEGRPSRGIVVSTLAEAEFLLPLGEEG-RVDDILYGLPV 89 (389) T ss_pred HHHHHHHHHHHHHHHH--HCCCCCCCCCHHHCCHHHHHHHHHCCCCCCCEEECCHHHHHHHHHHHHHC-CCEEEEECCCC T ss_conf 9999999999999998--75995711517651699999999779983538975799999999854516-62289988857 Q ss_pred CCCHHHHHCCCC----HHCCCCCCCCHHHHHHHHH-HHHCCCEEEEEEEECCCCCCCCCCCCC--HHHHHHHHHHCC-CC Q ss_conf 320013201110----0001222220013443333-331143036889700466563465700--012223443104-31 Q gi|254780801|r 83 QSNKVSEIVSLF----DVIETVSREKTASLLSLEM-IKQSRFLPVYIQVNTGYEIQKSGIMPN--QTKDFVILCRQK-YQ 154 (222) Q Consensus 83 QsNKvk~i~~~~----~~Ihsvds~~~a~~L~~~~-~~~~~~~~vliQVN~~~e~~K~G~~p~--el~~l~~~i~~~-~~ 154 (222) T Consensus 90 ~~~kl~rl~~L~~~~~~l~v~VD~~~~v~~L~~~~~~~~g~~l~V~Ievd~G--~~RtGv~~~~~~~~~l~~~i~~~~~~ 167 (389) T cd06817 90 PPSKLPRLAELSKKLGHLRVMVDNPEQLDFLEQFQPLKSGKKWSVFIKVDCG--THRAGVPPESEDAKELIQKLEKASEA 167 (389) T ss_pred CHHHHHHHHHHHCCCCCEEEEECCHHHHHHHHHHHHHHCCCCEEEEEEECCC--CCCCCCCCCCHHHHHHHHHHHHCCCC T ss_conf 8789999999855398089997479999999999886269825899997889--89678898839999999999856788 Q ss_pred CCHHHHEECCCCC---CC---CH----HHHHHHHHHHHHC----C--CCEECCCCCHH---------HHHHHHHCCCEEE Q ss_conf 1001110115433---45---20----5899999998875----8--94722477734---------8999980898899 Q gi|254780801|r 155 LNVEGLMCIPPAM---GN---PK----PHFYLLSEIAREC----K--LTKLSMGMTRD---------FELAIASGATSVR 209 (222) Q Consensus 155 L~i~GLMti~p~~---~d---~~----~~F~~l~~l~~~~----~--~~~LSmGMS~D---------~~~Ai~~Gst~vR 209 (222) T Consensus 168 L~~~Gl~~y~Gh~~~~~~~~e~~~~~~~~~~~~~~~~~~~~~~~g~~~~vvs~G~Tpt~~~~~~~~~~~~~~~~~~tEl~ 247 (389) T cd06817 168 VELFGFYSHAGHSYSSRSAEDAKEVLREEIEAVLTAAKKLKSIQGDRKLTLSVGATPTAHAAEALVLIPAPSLSGLLELH 247 (389) T ss_pred CEEEEEECCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCEEEECCCCCCCCCCCCCCCCCCCCCCCEEEE T ss_conf 35778860487555789999999999999999999999988626998758998588872203554422455556514970 Q ss_pred ECHHHCCCCCC Q ss_conf 71132389999 Q gi|254780801|r 210 IGSGIFGERPC 220 (222) Q Consensus 210 iGs~iFG~R~~ 220 (222) T Consensus 248 pG~Yvf~D~~~ 258 (389) T cd06817 248 AGNYPFYDLQQ 258 (389) T ss_pred CCCEECCCHHH T ss_conf 24647268878

HHsearch alignment for GI: 254780801 and conserved domain: cd06817