>TIGR00433 bioB biotin synthase; InterPro: IPR002684 Biotin synthase 2.8.1.6 from EC works with flavodoxin, S-adenosylmethionine, and possibly cysteine to catalyze the last step of the biotin biosynthetic pathway. The reaction consists of the introduction of a sulphur atom into dethiobiotin, thus requiring activation of C-H bonds . Biotin (vitamin H) is a prosthetic group in enzymes catalysing carboxylation and transcarboxylation reactions . Biotin synthase from Escherichia coli is a homodimer of 76 kDa, with each polypeptide chain carrying an oxygen-sensitive (4Fe-4S) cluster, probably ligated by three cysteines of a CXXXCXXC box conserved among all known BioB sequences and a fourth still not identified ligand. BioB displays a pyridoxal phosphate-dependent cysteine desulphurase activity, which allows mobilization of the sulphur atom from free cysteine . ; GO: 0004076 biotin synthase activity, 0009102 biotin biosynthetic process.

Probab=100.00 E-value=0 Score=499.67 Aligned_cols=296 Identities=50% Similarity=0.913 Sum_probs=275.0 Q ss_pred HHCCC---HHHHHHHHHHHHHHHCCCCEEEEEEEEEECCCCCCCCCCCCCCCCCCC----------CCCCCCCCCCHH-- Q ss_conf 97399---189999999998886289856999864530786834232124335477----------756410006857-- Q gi|254780485|r 27 IYNMP---FNDLLFWSHTVHRKNFEPNHIQLSKLLNIKTGGCPENCGYCNQSVHNK----------SKLKASKLINVD-- 91 (328) Q Consensus 27 L~~~~---~~el~~~Aa~~~r~~~~g~~V~~~~~in~~TN~C~~~C~fCaf~~~~~----------~~~~~~~~~~~E-- 91 (328) T Consensus 1 l~~~p~E~~l~Ll~~A~~~~r~~~~~~~v~Lc~i~N~KSG~C~EDC~YCsQSs~~~CniPiYPlk~~~~~~~~~~~~~De 80 (350) T TIGR00433 1 LYETPDEDLLDLLYEAFQIHRKHFNPRKVQLCTIMNIKSGGCPEDCGYCSQSSRSKCNIPIYPLKDTGLPIERLKKVDDE 80 (350) T ss_pred CCCCCCHHHHHHHHHHHHHHHHHHCCCEEEEEEEECCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHH T ss_conf 98887513799999999999873374802342110122185766776788555266886224566741789988767654 Q ss_pred ------------HHHHHHHHHHHCCC---------EEEEEECCCCCCCCCC------HHHHHHHHHHHCC--CCCCEEEE Q ss_conf ------------99999999996498---------3899730368887442------8999998876213--68832410 Q gi|254780485|r 92 ------------QVLKEAKNAKENGA---------TRYCMGAAWREPKERD------LSIIVDMIKGVKS--LGLETCMT 142 (328) Q Consensus 92 ------------ei~~~a~~~~~~G~---------~~~~l~~~~~~~~~~~------~~~~~e~i~~i~~--~~~~i~~~ 142 (328) T Consensus 81 Cskisssier~k~~l~eA~~a~~~G~PnrGfPlWv~rFClvasGR~~~~~~~~dref~~~v~~~~~~~~~ee~GL~~C~~ 160 (350) T TIGR00433 81 CSKISSSIEREKEILEEARAAKAAGAPNRGFPLWVTRFCLVASGRGPKDRESKDREFIEIVEAVVKIVEEEELGLKTCAT 160 (350) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCEEECCEEEEECCCCCCCCCCCCCHHHHHHHHHHHHHHHCCCCCHHHHC T ss_conf 32222111111378999999997087888853035014655417888877742202889999999997520037122320 Q ss_pred CCCCCHHHHHHHHCCCCCEEEEECC-CCHHHHHCCCCCCCHHHHHHHHHHHHHCCCCCCCEEEECCCCCHHHHHHHHHHH Q ss_conf 2569999999874157606975134-377773205888898999999999998798557707866898999999999999 Q gi|254780485|r 143 LGMLSFEQAQILSKAGLDYYNHNID-TSERFYPHVTTTHTFEDRLQTLENVRKSGIKVCCGGILGLGEMIDDRIDMLLTL 221 (328) Q Consensus 143 ~g~~~~~~~~~Lk~aG~~~~~~~le-t~~~~~~~~~~~~~~~~~l~~~~~a~~~G~~~~sg~l~G~gEt~eeri~~l~~l 221 (328) T Consensus 161 LG~l~~eqa~~LKdAGld~YNHNl~~TS~~~y~~I~sThty~DR~~T~~~~k~aGl~~CsGGI~GlgEt~~DrI~l~~~L 240 (350) T TIGR00433 161 LGLLDPEQAKQLKDAGLDRYNHNLDETSQEYYSKIISTHTYDDRVDTVKNAKEAGLKVCSGGILGLGETWEDRIGLALAL 240 (350) T ss_pred CCCCCHHHHHHHHHCCCCCCCCCHHHHHHHHCCCCEECCCHHHHHHHHHHHHHCCCCCCCCCEECCCCCHHHHHHHHHHH T ss_conf 37768899998886388611167367878766873432307767999999997388724462345898889999999997 Q ss_pred HHCCCCCCEEECCCEEECCCCC----CCC--CCCCCHHHHHHHHHHHHHHCCCCCCEEEEHHHHHCHHHHH---HHHHHC Q ss_conf 7408888602054112048741----244--5687989999999999996868721423115651656899---999809 Q gi|254780485|r 222 ANLSTPPESIPINLLIPIPGSK----FEE--NKKVDPIEHVRIISVARILMPKSRLRLAAGRAMMSDELQA---LCFFSG 292 (328) Q Consensus 222 r~l~~~~~~v~~~~~~p~~gt~----l~~--~~~~~~~e~lr~iAi~RL~lP~~~i~i~~~~~~~~~~~~~---~~L~~G 292 (328) T Consensus 241 ~~L~p~peSvPiN~L~~~~GTP~~E~L~~~~~~~L~~~~~Lk~iA~ari~mP~~~iRlagGR~~~m~e~~~kea~~~~ag 320 (350) T TIGR00433 241 ANLSPEPESVPINFLVKIEGTPAYEKLADGEVKKLSADDALKTIALARIIMPKAEIRLAGGREVNMKELQQKEAMCFMAG 320 (350) T ss_pred HCCCCCCCEECCCCEECCCCCCCHHHHCCCCCCCCCHHHHHHHHHHHHHHCCCCEEEEECCEEEECCCCCHHHHHHHHHH T ss_conf 52776787011132026888853443158886733889999999998865431100100251450476754899999984 Q ss_pred CCEEEECCEEECCCCCCHHHHHHHHHHCCC Q ss_conf 988997786651588898999999998298 Q gi|254780485|r 293 ANSIFVGDTLLTAKNPSYNKDTILFNRLGL 322 (328) Q Consensus 293 aN~~~~g~~~~t~~g~~~~~~~~~i~~~G~ 322 (328) T Consensus 321 ~Nsif~G~yLtT~g~~~eD~D~~~l~~lgL 350 (350) T TIGR00433 321 ANSIFVGDYLTTTGQPPEDEDKKLLAKLGL 350 (350) T ss_pred HHHHEECCCCCCCCCCCCHHHHHHHHHCCC T ss_conf 212304640024865886178999986179

HHsearch alignment for GI: 254780485 and conserved domain: TIGR00433