>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=0 Score=741.81 Aligned_cols=383 Identities=50% Similarity=0.838 Sum_probs=373.2 Q ss_pred CEEEEEEEECCCEEECHHHHHH-----HCCCCHHHHHHHCC---CCEEEECCCCCCHHHHHHHHHHHHHHHC--CHHHCC Q ss_conf 2066888734890455999998-----70999879763038---3246655998599999999999999727--957868 Q gi|254781019|r 3 IGIEDISFYTTNQYLDLSVIAE-----KYRLDVAKFYVGIG---QERMSVLNPDEDIVTMAAAAALPIMQNQ--DKNLID 72 (396) Q Consensus 3 vGI~~i~~y~P~~~v~~~~l~~-----~~g~~~~k~~~~lG---i~~r~v~~~~Ed~~tmA~~Aa~~~L~~~--~~~~Id 72 (396) 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 EEEEECCCCCCCCHHHHHHHHHHHCCCCCCE-----EEEECCCHHHHHHHHHHHHHHHHCCCC-CEEEEEECCCCCCCCC Q ss_conf 9999457887546005888863202687735-----898414203588899878999973999-7699950332014588 Q gi|254781019|r 73 TLFFATESSVDQSKSAAIWLHKLLGLNSSCR-----VVELKQACYSATCALHMACALVAKSPE-RKVLIVASDVARYDLG 146 (396) Q Consensus 73 ~li~~T~t~~~~~~~~a~~v~~~Lgl~~~~~-----~~Di~~aC~g~~~AL~~A~~~i~sg~~-~~aLVV~sD~~~~~~~ 146 (396) T Consensus 81 ~Vi~gTESgID~SKAaavyvh~LLgl~p~cRGnnFL~~ElK~ACYGATAaLq~A~~hv~~~P~s~kVLViaSDiAkY~~~ 160 (412) T TIGR01835 81 MVIFGTESGIDQSKAAAVYVHGLLGLQPFCRGNNFLSFELKQACYGATAALQMAKGHVARSPNSRKVLVIASDIAKYGLE 160 (412) T ss_pred EEEEEEECCHHHHHHHHHHHHHHHCCCCCCCCCCEEEEEHHHHHHHHHHHHHHHHHHHHHCCCCCEEEEEEEEEEECCCC T ss_conf 78975105266899999999998277843104542243277777999999999999985188866016888631122779 Q ss_pred CCCCCCCCCCEEEEEECCCCCCCEEEECCC-CCCCCCCCCCCCCCCCCEEECCHHHHHHHHHHHHHHHHHHHHHCCCCHH Q ss_conf 875334783024688426876303531000-1567865112758875423566016989999999999999996298821 Q gi|254781019|r 147 SSGEPTQGCGAVAILISSQTSILEIEDITG-IYTNDCMDFWRPNYRRTALVDGKYSTKIYLQSLEAVWHDYQKNKGHDFN 225 (396) Q Consensus 147 ~~~~~t~GaGA~Allv~~~~~~~~~~~~~~-~~~~~~~df~rp~~~~~~~~dg~~~~~~y~~~~~~a~~~~l~~~g~~~~ 225 (396) T Consensus 161 t~GE~TQGAGAVA~Li~~dP~~l~i~~~~~G~~T~DimDFWRP~y~~~a~VdG~~S~~~Yl~a~~~aW~dy~~~~~~~l~ 240 (412) T TIGR01835 161 TPGEATQGAGAVAMLISADPKLLAINEDSVGLYTDDIMDFWRPNYSTTALVDGQYSTEQYLNALEEAWNDYKERTGLSLE 240 (412) T ss_pred CCCCCCHHHHHHHHHHHCCCHHHHCCCCCCCEECCCCCCCCCCCCCCCCEECCCHHHHHHHHHHHHHHHHHHHHCCCCHH T ss_conf 89886166899999874180120015876531213312121789885531646046889999999999999972389756 Q ss_pred HCCE---EEECCCCCHHHHHHHHHHCCHHHHHHHHHHHHHHHHHHHHHHH------HCCCCCCCHHHHHHHHHHHHCC-- Q ss_conf 1012---3311454057888886411024544100134555433344453------2385432338999999997157-- Q gi|254781019|r 226 DFQY---FCYHQPFTRMAEKAHIRLSKIVHQNLSVAEIEKAIGITTLYNR------LIGNSYTASLYIALISLLDHSS-- 294 (396) Q Consensus 226 did~---~v~H~p~~k~~~~~~~~l~~~~~~~~~~~~~e~~~~~~~~~~~------~~GN~~SASi~l~L~slLe~~~-- 294 (396) T Consensus 241 DfaanYR~~fH~PftKMg~Ka~~~~l~~~~~~~~k~~~~~~y~~Si~Y~~Gveaam~vGN~YTGSlyLgL~sLLena~sk 320 (412) T TIGR01835 241 DFAANYRFCFHVPFTKMGLKALRHILKKNKEDEDKDSVQKAYEESILYNRGVEAAMEVGNLYTGSLYLGLASLLENAQSK 320 (412) T ss_pred HHHCCCCEEEECCCCCCHHHHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHCCCCC T ss_conf 75315717870787420379999987404781268999998753367852344333305413788999999986303664 Q ss_pred CCCCCCEEEEEEECCCCCEEEEEEEEECCHHHHHHCCCHHHHHHCCCCCCHHHHHHHHHHCCCCCC-CCCCCCCCCCCCE Q ss_conf 436988899984079830377877860226876520387889742722389999999863068888-7631666788866 Q gi|254781019|r 295 ENLAGKRVGFFSYGSGCVAEFFSGIVQKNYRKKSHQKRHQHIINSRIPISYQVYCDLHQDIIPSVE-GNCTIPHTTTGPF 373 (396) Q Consensus 295 ~~~~G~rIll~syGsG~~a~~f~~~v~~~~~~~~~~~~~~~~L~~r~~l~~~~y~~~~~~~~~~~~-~~~~~~~~~~~~~ 373 (396) T Consensus 321 ~d~tG~~Igl~SYGSGavaEFF~g~l~~Gy~~~L~~~~~~~~l~~R~~~~~~eY~~~F~~~~~~dg~~~~~~~~~~~~~f 400 (412) T TIGR01835 321 EDLTGDKIGLFSYGSGAVAEFFSGTLVEGYEDHLKKERHLELLKNRTEVSVAEYEKLFEETIPTDGSDSADATGEDRGEF 400 (412) T ss_pred CCCCCCEEEEEECCCCCEEEEEEEEECHHHHHHHHHHHHHHHHHCCCCCCHHHHHHHHHHCCCCCCCCCCCCCCCCHHHH T ss_conf 43131111100125220110010044045898878999999987177468899999986206898875001566220255 Q ss_pred EEEEEECCEEEE Q ss_conf 983565538998 Q gi|254781019|r 374 RLATIQNHKRIY 385 (396) Q Consensus 374 ~l~~i~~~~R~Y 385 (396) T Consensus 401 ~l~~I~d~~R~Y 412 (412) T TIGR01835 401 RLAGINDHKRIY 412 (412) T ss_pred HHHHHCCCCCCC T ss_conf 554440676779

HHsearch alignment for GI: 254781019 and conserved domain: TIGR01835