HHsearch alignment for GI: 254780604 and conserved domain: TIGR02080

>TIGR02080 O_succ_thio_ly O-succinylhomoserine (thiol)-lyase; InterPro: IPR011821 Proteins in this entry are important in the interconversion of the sulphur-containing amino acids L-cysteine and L-methionine in bacteria. In bacteria, inorganic sulphur is reduced to sulphide, which is then used to displace the acetyl group of O-acetyl-L-serine to form the essential amino acid L-cysteine. Biosynthesis of L-methionine then occurs via the transsulphuration pathway which involves the sequential action of two pyridoxal 5'-phosphate (PLP) enzymes, cystathionine gamma-synthase (CGS) and cystathionine beta-lyase (CBL). Firstly CGS catalyses the formation of the intermediate cystathione from a homoserine ester and L-cysteine. This intermediate is then converted by CBL to L-homoserine, which is subsequently methylated by methionine synthase to form L-methionine. For more information see . The CGS enzyme (P00935 from SWISSPROT) from Escherichia coli is, like other CGS enzymes, a homotetramer composed of two catalytically active dimers . The active site of each dimer is found at the interface between the monomers and involves residues from each monomer. Catalysis occurs by alpha,gamma-elimination/replacement reactions..
Probab=99.29  E-value=8.5e-10  Score=82.93  Aligned_cols=276  Identities=20%  Similarity=0.290  Sum_probs=165.8

Q ss_pred             HHHHHHHHCCCCCEEEEECCCCCHHHHHCCCCCCCCCEEEEHHHHHHHH---HHHH-HHHCCCCEEEECCCCHHHHHHHH
Q ss_conf             9998887349973377405652012220234677887234213211167---5201-45316513531679988988867
Q gi|254780604|r   95 LEKELATLHGKKAALIFNSGYIANWATIGTLCSQIDNIICFSDSHNHAS---IIEG-INKARCKKVIWNHNDLEDLEKNL  170 (401)
Q Consensus        95 LE~~la~~~g~e~al~~~SG~~An~~~i~~l~~~~d~ii~~~D~~~HaS---i~~g-~~l~~a~~~~f~HnD~~~Le~~L  170 (401)
T Consensus        56 l~~aLA~LE~G~~AVvT~~GMsAI~L~~~~lL~pdDLlvAPHD--CYGGtYRLl~~lA~kG~~~v~fVDQ~D~~al~~AL  133 (383)
T TIGR02080        56 LQQALAELEGGAGAVVTNSGMSAIDLVTTALLGPDDLLVAPHD--CYGGTYRLLNALAKKGQFKVQFVDQSDEQALEAAL  133 (383)
T ss_pred             HHHHHHHHHCCCCCEECCCHHHHHHHHHHHEECCCCEEEECCC--CCCCHHHHHHHHHHCCCEEEEEEECCHHHHHHHHH
T ss_conf             9999999848998256685689887664312078976880432--67704888864520783389986076289999999


Q ss_pred             HHCCCCCCCEEECCCCC-CCCCCHHHHHHHHHHHHCCCCEEEECCCCCCCCCCCHHHHHHHHHHCCCCCCHHHCCCCCCC
Q ss_conf             40663356236216743-56773368999999840147189971211001256025899999720200101101444322
Q gi|254780604|r  171 AATDLSIPKIIIFESIY-SMDGDIAPIKEICDLADQYNAITYIDEVHAVGIHGSCGAGISEREGIMNRITIISGTLAKGF  249 (401)
Q Consensus       171 ~~~~~~~~~iIv~e~v~-Sm~G~~apL~~l~~l~~~~~~~LivDEAH~~Gv~G~~G~G~~~~~g~~~~~di~~~TlsKa~  249 (401)
T Consensus       134 a~kd---PKLVlIEtPSNPLl-RVVDI~~lc~La~~~G~~vvVDNTF----LsP-----~lQ~PL~LGAD~V~HS~TKYl  200 (383)
T TIGR02080       134 AQKD---PKLVLIETPSNPLL-RVVDIAKLCKLAKAVGAVVVVDNTF----LSP-----ILQQPLSLGADLVIHSTTKYL  200 (383)
T ss_pred             HHCC---CCEEEEECCCCCCC-HHHHHHHHHHHHHHCCEEEEEECCC----CCH-----HHCCCCCHHCCEEHHHHHCCC
T ss_conf             7469---84799867998852-1888999998876188389985521----677-----672753011113011111000


Q ss_pred             -CC---CEE-EEECCHHHHHHHHCCCCCCCCCCCCCCHHHHHHHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHC------
Q ss_conf             -22---316-8754844500000133222333444431478899876432012016888899998766656644------
Q gi|254780604|r  250 -GT---FGG-YIAASENLCDFIRSFASGFIFSTSLPPAIASASVTSIQYIKQHYDERKKYLERVKQLRHSLENK------  318 (401)
Q Consensus       250 -g~---~GG-~i~g~~~~~~~l~~~~~~~ifs~~l~p~~~aa~~~al~~l~~~~~~~~~l~~~~~~l~~~L~~~------  318 (401)
T Consensus       201 NGHSDVi~GaVIaKd~q~~e~L~WW~N~l-G~tG-~aFDSY~tLRGlRTL---~~Rm~~~qrnA~~Iv~yL~~~P~V~k~  275 (383)
T TIGR02080       201 NGHSDVIAGAVIAKDPQLAEELAWWANAL-GVTG-GAFDSYLTLRGLRTL---AARMRSQQRNAQTIVEYLQTQPLVKKV  275 (383)
T ss_pred             CCCHHHHHHHHHCCCHHHHHHHHHHHHCC-CCCC-CHHHHHHHHHHHHHH---HHHHHHHHHHHHHHHHHHHCCCCEEEE
T ss_conf             34034312124014712234433343002-5544-434688998678888---888888878899999998448940263


Q ss_pred             CCCCCC-------------CCCCEEEEEE-CCHHHHHHHHHHH----HHH-C-CEEEEEECCCCCC--------------
Q ss_conf             983037-------------8986599996-8979999999999----973-7-9099840488888--------------
Q gi|254780604|r  319 AIPCIP-------------NESHIIPIMV-GDSHKCTQISNIL----LKE-F-GIYIQPINYPTVA--------------  364 (401)
Q Consensus       319 g~~~~~-------------~~s~Ivpi~~-g~~~~~~~~~~~l----L~e-~-Gi~v~~i~~PtVp--------------  364 (401)
T Consensus       276 YyPgLpdH~GH~IA~~QQ~GFGAmlSFEL~G~~~~v~~FL~~L~LFtLAESLGGVE-SLiaHPATMTH~aM~~eAR~~AG  354 (383)
T TIGR02080       276 YYPGLPDHPGHEIAARQQKGFGAMLSFELKGGEEAVRRFLGKLSLFTLAESLGGVE-SLIAHPATMTHAAMGPEARAEAG  354 (383)
T ss_pred             ECCCCCCCCCHHHHHHHCCCCCCEEEEEECCCHHHHHHHHHHCCCHHHHHHHCCHH-HHHCHHHCCCCHHHHHHHHHHCC
T ss_conf             35878886676999862565433023332188689999984314012123315512-33330101260210189897458


Q ss_pred             CCCCEEEEECCCCCCHHHHHHHHHHHHHHHH
Q ss_conf             8872189961857999999999999999999
Q gi|254780604|r  365 KKKERLRVTLTPLHTDSDIEHLVSSLENVWQ  395 (401)
Q Consensus       365 ~g~~rlRi~l~a~ht~edid~~~~~l~~v~~  395 (401)
T Consensus       355 I~~~LLRlSvGl----ED~~DLiaDL~~gl~  381 (383)
T TIGR02080       355 ISDTLLRLSVGL----EDADDLIADLDQGLQ  381 (383)
T ss_pred             CCCCCCEEEEEE----CCHHHHHHHHHHHHH
T ss_conf             411420002100----346889999999974