>TIGR02418 acolac_catab acetolactate synthase, catabolic; InterPro: IPR012782 Acetolactate synthase is a thiamin pyrophosphate-dependent enzyme that combines two molecules of pyruvate to yield 2-acetolactate with the release of CO2. It exists in two distinct forms that have different properties, though they are clearly related , . The biosynthetic form, found in plants, fungi and bacteria, is involved in the biosynthesis of branched-chain amino acids and contains non-catalytic FAD. The catabolic form is found only in some bacteria, participates in butanediol fermentation, and does not contain FAD. This entry represents the catabolic form of acetolactate synthase, generally found in species that posses acetolactate decarboxylase, which is often encoded in the same operon. The enzyme is thought to be a homotetramer, though this has not conclusively been shown. Each monomer consists of three distinct domains, designated, starting from the N-terminus, as alpha, beta and gamma . The core of the alpha and gamma domains is a six-stranded parallel beta sheet surrounded by alpha helices, while the the beta domain forms a double Rossman fold. The thiamin pyrophosphate cofactor has an unusual conformation that has not been seen in other enzymes using this cofactor, including the biosynthetic form of acetolactate synthase. The active site is located in a funnel at the dimer interface, bordered by residues from all three domains.; GO: 0000287 magnesium ion binding, 0003984 acetolactate synthase activity, 0030976 thiamin pyrophosphate binding, 0050660 FAD binding.

Probab=93.89 E-value=0.025 Score=36.10 Aligned_cols=276 Identities=13% Similarity=0.157 Sum_probs=151.8 Q ss_pred HHHHHCCC-----EEEEEC---CHH-HH-HHH--CCCCCEEEEECCCCCCCHH-HHHHHHHHHCCCCCEEEEECCCC--- Q ss_conf 99998898-----899989---379-99-986--0899899997854698889-99999998578983999926899--- Q gi|254780916|r 28 DHVESYGY-----DVFIVN---VSD-LS-TIS--KIQVNVIFLSLINCEDDKE-NILKNIVDKIPIVPIIVQTTQDN--- 91 (482) Q Consensus 28 ~~L~~~G~-----~v~~a~---~~a-l~-~l~--~~~~dlillD~~mP~~dGl-ell~~i~~~~p~ipvIiiT~~~~--- 91 (482) T Consensus 30 daLeD~~iGqkvP~lIv~RHEqNAaFMAqavGRlTGkpGV~lvT-SGPG~sNL~TGl~TAn~-EGD-PVvAiGG~VkR~D 106 (553) T TIGR02418 30 DALEDKGIGQKVPELIVVRHEQNAAFMAQAVGRLTGKPGVALVT-SGPGVSNLVTGLLTANS-EGD-PVVAIGGQVKRAD 106 (553) T ss_pred CHHCCCCCCCCCCEEEECCCHHHHHHHHHHHHHHCCCCCEEEEE-CCCCHHHHHHHHHEECC-CCC-HHHHCCCCCCHHH T ss_conf 02207887754761541322145899999986305998659980-68881446743310156-776-3541167763244 Q ss_pred ------HHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC----------C-CCCCCCC-------CCCC Q ss_conf ------99999888505743222222222222222222222222222221----------1-1111112-------2222 Q gi|254780916|r 92 ------IKILNCFLYNRISKFFLNLVSRKQLCDSIICALREGVVPSQENE----------H-CALDSLI-------AVSP 147 (482) Q Consensus 92 ------~~~~~~a~~~g~~d~l~KP~~~~~L~~~i~~al~~~~~~~~~~~----------~-~~~~~Li-------G~S~ 147 (482) T Consensus 107 ~~k~tHQS~d~valf~piTKYSaEvqd~~~lsE~vaNAfR~A~~Gk~GAaFvS~PQDV~~~kp~s~~~i~~~~~P~~Gaa 186 (553) T TIGR02418 107 LLKLTHQSMDNVALFRPITKYSAEVQDPDALSEVVANAFRLAESGKPGAAFVSLPQDVVDSKPVSVKAIPAVAAPKLGAA 186 (553) T ss_pred HHHHHHCCHHHHHHHCCCCCCEEEEECCCCHHHHHHHHHHHHHHCCCCCCEEECCCCCCCCCCCCHHHHHHHHCCCCCCC T ss_conf 22233011245777078020134566676547899999999971489662550573214887555345212214678887 Q ss_pred CCCCCCCCCCCCCCCCEEEEEECCCCCHHHHHHHHHHHCCCCCCCCCCC-CCCCC-CCCCCCHHHHHCCCCCCCCCCCCC Q ss_conf 2222222222234432048873277743679999998426754332101-23465-542100243311255553221110 Q gi|254780916|r 148 AMIQVVDLARKAGDCAIPIMIQGEFGVGKKRLSRFIHESGKRAFFPFFI-VNCGM-IDQDKIEKFLFGDVDLQTKNSAQF 225 (482) Q Consensus 148 ~m~~v~~~i~~~a~~~~~vli~Ge~GtGK~~~A~~iH~~s~r~~~~fi~-v~c~~-~~~~~~e~~lFG~~~~~~~~~~~~ 225 (482) T Consensus 187 ~~~~i~~~~~~I~~Ak~PVlLlG~~aS~-~~~~~Av~rll~k~~LPvVeTfQgAG~vsrele~~TFfGRvGLFrNQ~GD~ 265 (553) T TIGR02418 187 ADADIDEVAEAIKNAKLPVLLLGLRASS-QETTEAVRRLLKKTQLPVVETFQGAGVVSRELEDETFFGRVGLFRNQPGDK 265 (553) T ss_pred HHHHHHHHHHHHHHCCCCEEEEECCCCC-HHHHHHHHHHHCCCCCCCEEEEECCEEECHHCCCCCCEECCCCCCCCCCHH T ss_conf 3889999999998319966985047888-899999999864606882140200513110024565210011445870025 Q ss_pred CCCCCCCCCCEEEECCCCHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCEEEEECCCCCCCCCCHHHHHHHHHHHHHHH Q ss_conf 01234466714751664200188999888877642001123553212343156521433211111123337999886543 Q gi|254780916|r 226 LGKFIEANGGTIVLEEPDALPLAVQGRIYNFIETGKIEFFDSRGAIRLDVRLIFLTEKNLLPQVKSHVFRKDLYYRISVF 305 (482) Q Consensus 226 ~g~~~~a~~Gtl~l~ei~~L~~~~Q~~Ll~~l~~~~~~~~g~~~~~~~~~RiIa~t~~~L~~~~~~g~fr~dLy~rL~~~ 305 (482) T Consensus 266 --LLk~aD---LvIt-IGYdPI-------------EYep~~WN~--~~~~~Iv~iD-----~~~A~-------------i 306 (553) T TIGR02418 266 --LLKQAD---LVIT-IGYDPI-------------EYEPRNWNS--ELDATIVHID-----VEPAE-------------I 306 (553) T ss_pred --HHHHCC---EEEE-ECCCCE-------------ECCHHHCCC--CCCCEEEEEE-----EEEEE-------------H T ss_conf --775669---7898-338850-------------307554477--8872068973-----14421-------------2 Q ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCC Q ss_conf 3446778774422225566777641011223333211111000122 Q gi|254780916|r 306 LINISTLRSRSEDIPWLVHFFLQSFCTKNAIKQISISDKALSLLTK 351 (482) Q Consensus 306 ~i~iPpLReR~eDI~~L~~~fl~~~~~~~~~~~~~ls~~a~~~L~~ 351 (482) T Consensus 307 ~~~yqP~~eLvGdia~tl~~l~~~~~~~-----~~L~~~~~~~L~~ 347 (553) T TIGR02418 307 DNNYQPDLELVGDIASTLDLLAERVEGF-----YELPEDAQDILED 347 (553) T ss_pred HHCCCCCHHHHCCHHHHHHHHHHHHCCC-----CCCCHHHHHHHHH T ss_conf 0036861443257277799995862466-----1058889999999

HHsearch alignment for GI: 254780916 and conserved domain: TIGR02418