>TIGR01835 HMG-CoA-S_prok hydroxymethylglutaryl-CoA synthase; InterPro: IPR011554 Synonym(s): 3-hydroxy-3-methylglutaryl-coenzyme A synthase, HMG-CoA synthase. Hydroxymethylglutaryl-CoA synthase (2.3.3.10 from EC) catalyses the condensation of acetyl-CoA with acetoacetyl-CoA to produce HMG-CoA and CoA, the second reaction in the mevalonate-dependent isoprenoid biosynthesis pathway. HMG-CoA synthase contains an important catalytic cysteine residue that acts as a nucleophile in the first step of the reaction: the acetylation of the enzyme by acetyl-CoA (its first substrate) to produce an acetyl-enzyme thioester, releasing the reduced coenzyme A. The subsequent nucleophilic attack on acetoacetyl-CoA (its second substrate) leads to the formation of HMG-CoA . HMG-CoA synthase occurs in eukaryotes, archaea and certain bacteria . In vertebrates, there are two isozymes located in different subcellular compartments: a cytosolic form that is the starting point of the mevalonate pathway (leads to cholesterol and other sterolic and isoprenoid compounds), and a mitochondrial form responsible for ketone body biosynthesis. HMG-CoA is also found in other eukaryotes such as insects, plants and fungi . In bacteria, isoprenoid precursors are generally synthesised via an alternative, non-mevalonate pathway, however a number of Gram-positive pathogens utilise a mevalonate pathway involving HMG-CoA synthase that is parallel to that found in eukaryotes , . This entry represents HMG-CoA synthase enzymes found in a limited spectrum of mostly Gram-positive bacteria, which make isopentenyl pyrophosphate (IPP) via the mevalonate pathway..

Probab=100.00 E-value=8.3e-37 Score=254.65 Aligned_cols=296 Identities=19% Similarity=0.234 Sum_probs=238.8 Q ss_pred EEEEEEEEECCCCEECHHHHHH-----HHCCCHHHHHHCCC---CCEEEEECCCCCHHHHHHHHHHHHHHHHCCCCCCCC Q ss_conf 6999999964984117889998-----80999878110247---518898289889999999999999974021235443 Q gi|254780497|r 4 STVRGIGLSLPRRVLSNSDLES-----IVDTSDGWIKRRVG---ISRRHIAGKDETTASLGEAAARDALHHAEMSVDDID 75 (324) Q Consensus 4 ~~I~~~g~ylP~~~v~~~el~~-----~~~~~~~~i~~~~G---I~~R~~~~~~e~~~~la~~Aa~~al~~a~~~~~~Id 75 (324) T Consensus 1 IGI~~I~F~~p~~yl~~~~LAEnPLYF~~gv~p~K~~~GIgatLQ~~~~~~~~~eDiVTmAA~Aa~~Il~~~nLd~~~Id 80 (412) T TIGR01835 1 IGIDKISFFTPQYYLDLTALAENPLYFARGVDPEKFSKGIGATLQKKMAVPPIDEDIVTMAASAAKPILDRNNLDKQKID 80 (412) T ss_pred CCCCHHHHHCCCCCCCHHHHHHCCHHHHCCCCHHHHHHHHHHHHHHHCCCCCCCCCHHHHHHHHHHHHHHHHCCCCCCCC T ss_conf 97011234403000353566304114541766435757743677765068978864578899999974324206844234 Q ss_pred EEEEECCCCCCCCCCCCCCHHHHHHCC-CCC-----CCCCCCCCCCHHHHHHHHHHHHHHCCC-CCCEEEEECCCCCCCC Q ss_conf 366501223345898531001122026-864-----444210122003467888998964155-6531676302243222 Q gi|254780497|r 76 LIIVATSTPDQTFPSTAVNIQNRLGMK-RGF-----AFDMQAVCSGFVYAVTTADSYIRSGVV-RRVMVIGSDTFSRIVD 148 (324) Q Consensus 76 ~ii~~s~~~~~~~p~~a~~i~~~LGl~-~~~-----~~di~~~C~~~~~al~~A~~li~~g~~-~~~Lvv~~e~~S~~~d 148 (324) T Consensus 81 ~Vi~gTESgID~SKAaavyvh~LLgl~p~cRGnnFL~~ElK~ACYGATAaLq~A~~hv~~~P~s~kVLViaSDiA-k--- 156 (412) T TIGR01835 81 MVIFGTESGIDQSKAAAVYVHGLLGLQPFCRGNNFLSFELKQACYGATAALQMAKGHVARSPNSRKVLVIASDIA-K--- 156 (412) T ss_pred EEEEEEECCHHHHHHHHHHHHHHHCCCCCCCCCCEEEEEHHHHHHHHHHHHHHHHHHHHHCCCCCEEEEEEEEEE-E--- T ss_conf 789751052668999999999982778431045422432777779999999999999851888660168886311-2--- Q ss_pred CCCCCCC-CCCCCCCCEEEEECCCCCCCCCCCCC-CEEEEEECCCCCCCCEEECCCCCCCCCCCCHHHCCHHHHHHHHHH Q ss_conf 4566323-23454431234402654465434454-101232035555561775487654443320010320244455777 Q gi|254780497|r 149 WSDRSTC-VLFGDGAGALILEGVEVKGSSMADTG-ILSTYLCSDGSYIDKLYVDGGPSTSRTVGCIRMEGKAVFKYAVEK 226 (324) Q Consensus 149 ~~d~~~~-~lfGDGAaA~ll~~~~~~~~~~~~~~-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~g~~~~~~~~~~ 226 (324) T Consensus 157 Y~~~t~GE~TQGAGAVA~Li~~dP~~l~i~~~~~G~~T-----~--DimDFWRP~y~------~~a~VdG~~S~~~Yl~a 223 (412) T TIGR01835 157 YGLETPGEATQGAGAVAMLISADPKLLAINEDSVGLYT-----D--DIMDFWRPNYS------TTALVDGQYSTEQYLNA 223 (412) T ss_pred CCCCCCCCCCHHHHHHHHHHHCCCHHHHCCCCCCCEEC-----C--CCCCCCCCCCC------CCCEECCCHHHHHHHHH T ss_conf 27798988616689999987418012001587653121-----3--31212178988------55316460468899999 Q ss_pred HHHHHHHHHHHHHCCCCCCCC---CCCCCCCHHH-HHHHHHHC---CCCHH--HHH-----H--HHH------HHCCCHH Q ss_conf 777788889874001000121---0244444158-99999971---97876--733-----6--586------5193301 Q gi|254780497|r 227 AVELIEKVFDSTHLTIENIDW---FVPHQANWRI-INSIVDKM---KIPFD--KVI-----V--TVD------IHGNTSA 284 (324) Q Consensus 227 ~~~~i~~~L~~~gl~~~did~---~~~Hq~~~~~-~~~~~~~l---gl~~e--~~~-----~--~~~------~~Gn~~s 284 (324) T Consensus 224 ~~~aW~dy~~~~~~~l~DfaanYR~~fH~PftKMg~Ka~~~~l~~~~~~~~k~~~~~~y~~Si~Y~~Gveaam~vGN~YT 303 (412) T TIGR01835 224 LEEAWNDYKERTGLSLEDFAANYRFCFHVPFTKMGLKALRHILKKNKEDEDKDSVQKAYEESILYNRGVEAAMEVGNLYT 303 (412) T ss_pred HHHHHHHHHHHCCCCHHHHHCCCCEEEECCCCCCHHHHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHH T ss_conf 99999999972389756753157178707874203799999874047812689999987533678523443333054137 Q ss_pred HHHHHHHHHHHHCC---CCCCCCEEEEEEECCCCC Q ss_conf 26999999999806---889998999999714501 Q gi|254780497|r 285 ASIPLALAVAVKEG---RVKKGDCLLLEAMGGGFT 316 (324) Q Consensus 285 as~~~~L~~~~~~g---~l~~Gd~vll~~~G~G~s 316 (324) T Consensus 304 GSlyLgL~sLLena~sk~d~tG~~Igl~SYGSGav 338 (412) T TIGR01835 304 GSLYLGLASLLENAQSKEDLTGDKIGLFSYGSGAV 338 (412) T ss_pred HHHHHHHHHHHHCCCCCCCCCCCEEEEEECCCCCE T ss_conf 88999999986303664431311111001252201

HHsearch alignment for GI: 254780497 and conserved domain: TIGR01835