>TIGR01833 HMG-CoA-S_euk hydroxymethylglutaryl-CoA synthase; InterPro: IPR010122 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 is specific for eukaryotic HMG-CoA synthase enzymes.; GO: 0004421 hydroxymethylglutaryl-CoA synthase activity, 0008299 isoprenoid biosynthetic process.

Probab=100.00 E-value=0 Score=676.57 Aligned_cols=386 Identities=30% Similarity=0.489 Sum_probs=355.5 Q ss_pred CCEEEEEEEECCCEEECHHHHHHHCCCCHHHHHHHCCCCEEEECCCCCCHHHHHHHHHHHHHHHC--CHHHCCEEEEECC Q ss_conf 62066888734890455999998709998797630383246655998599999999999999727--9578689999457 Q gi|254781019|r 2 AIGIEDISFYTTNQYLDLSVIAEKYRLDVAKFYVGIGQERMSVLNPDEDIVTMAAAAALPIMQNQ--DKNLIDTLFFATE 79 (396) Q Consensus 2 ~vGI~~i~~y~P~~~v~~~~l~~~~g~~~~k~~~~lGi~~r~v~~~~Ed~~tmA~~Aa~~~L~~~--~~~~Id~li~~T~ 79 (396) T Consensus 4 dVGI~al~~yfP~~yV~Q~~LE~yDgVs~GKYTiGLGq~~mgFc~drEDI~Sl~LTvv~~L~er~~id~~~IGRLEVGTE 83 (461) T TIGR01833 4 DVGILALEIYFPSQYVDQAELEKYDGVSAGKYTIGLGQTKMGFCTDREDINSLCLTVVSKLMERYQIDYNKIGRLEVGTE 83 (461) T ss_pred CCEEEEEEEECCCCCCCHHHHHHHCCCCCCCEEECCCCCCCEEECCCCHHHHHHHHHHHHHHHHHCCCCCCCCEEECCCE T ss_conf 74068888636887526577863268888950342356620000221015666589999999860787154311010425 Q ss_pred CCCCCCHHHHHHHHHHHCC--CCCCEEEEECCCHHHHHHHHHHHHHHHHCCC--CCEEEEEECCCCCCCCCCCCCCCCCC Q ss_conf 8875460058888632026--8773589841420358889987899997399--97699950332014588875334783 Q gi|254781019|r 80 SSVDQSKSAAIWLHKLLGL--NSSCRVVELKQACYSATCALHMACALVAKSP--ERKVLIVASDVARYDLGSSGEPTQGC 155 (396) Q Consensus 80 t~~~~~~~~a~~v~~~Lgl--~~~~~~~Di~~aC~g~~~AL~~A~~~i~sg~--~~~aLVV~sD~~~~~~~~~~~~t~Ga 155 (396) T Consensus 84 TiiDKSKSVKtVLMQLF~~sGNTDvEGiDt~NACYGGTaALFNa~~WiESssWDGRyalVVagDiAvYa~G-~ARPTGGA 162 (461) T TIGR01833 84 TIIDKSKSVKTVLMQLFEESGNTDVEGIDTVNACYGGTAALFNAINWIESSSWDGRYALVVAGDIAVYAKG-NARPTGGA 162 (461) T ss_pred EEEECHHHHHHHHHHHHHHCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHCCCCCCCCEEEEEEEEEECCCC-CCCCCHHH T ss_conf 34100103557767754205795435325534112247999754543212675303412453211134888-98875289 Q ss_pred CEEEEEECCCCCCCEEEECCCCCCCCCCCCCCCC-CCCCEEECCHHHHHHHHHHHHHHHHHHHHH------------CCC Q ss_conf 0246884268763035310001567865112758-875423566016989999999999999996------------298 Q gi|254781019|r 156 GAVAILISSQTSILEIEDITGIYTNDCMDFWRPN-YRRTALVDGKYSTKIYLQSLEAVWHDYQKN------------KGH 222 (396) Q Consensus 156 GA~Allv~~~~~~~~~~~~~~~~~~~~~df~rp~-~~~~~~~dg~~~~~~y~~~~~~a~~~~l~~------------~g~ 222 (396) T Consensus 163 GavAmLiGp~APivfe~glR~shM~HaYDFYKPdL~SEYP~VDGklS~~CYl~ALD~cY~~y~~K~~~~~~~~~~~~~~f 242 (461) T TIGR01833 163 GAVAMLIGPNAPIVFERGLRASHMQHAYDFYKPDLASEYPVVDGKLSIQCYLSALDRCYKSYCKKIEKQLGKSGKDGRKF 242 (461) T ss_pred HHHHHHHCCCCCEEECCCCCHHHHCCCCCCCCCCCCCCCCEECCCCCHHHHHHHHHHHHHHHHHHHHHHHHCCCCCCCCC T ss_conf 99999756898887427754122214533368888316850445305878998988888998888998742024467633 Q ss_pred CHHHCCEEEECCCCCHHHHHHHHHHCCH-------------------------------------HHHHHHHHHHHHHHH Q ss_conf 8211012331145405788888641102-------------------------------------454410013455543 Q gi|254781019|r 223 DFNDFQYFCYHQPFTRMAEKAHIRLSKI-------------------------------------VHQNLSVAEIEKAIG 265 (396) Q Consensus 223 ~~~did~~v~H~p~~k~~~~~~~~l~~~-------------------------------------~~~~~~~~~~e~~~~ 265 (396) T Consensus 243 ~l~~~dy~vFH~PyCKlVqKS~ARLlyNDF~~~~~~~~~~~~~~~~~~l~~l~~~~ty~drd~EK~~~~~sk~~f~~k~~ 322 (461) T TIGR01833 243 TLDDFDYMVFHSPYCKLVQKSLARLLYNDFLANPSSETDTALYEVLEALSTLKLEDTYTDRDLEKAFMKISKELFDKKVK 322 (461) T ss_pred CHHHCCEEEEECCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHCCHHHHHHHHHHHHHHHHHHCC T ss_conf 06344736750773226899999998888763223445566666677653377112002325889999999998861020 Q ss_pred HHHHHHHHCCCCCCCHHHHHHHHHHHHCCC-CCCCCEEEEEEECCCCCEEEEEEEEECC-------HHHHHHCCCHHHHH Q ss_conf 334445323854323389999999971574-3698889998407983037787786022-------68765203878897 Q gi|254781019|r 266 ITTLYNRLIGNSYTASLYIALISLLDHSSE-NLAGKRVGFFSYGSGCVAEFFSGIVQKN-------YRKKSHQKRHQHII 337 (396) Q Consensus 266 ~~~~~~~~~GN~~SASi~l~L~slLe~~~~-~~~G~rIll~syGsG~~a~~f~~~v~~~-------~~~~~~~~~~~~~L 337 (396) T Consensus 323 ~Sl~~~~~~GNMYT~SlYg~laSLL~~~~~~eLaGkRv~~FSYGSGlAAs~FS~~~~~D~~p~S~l~~~~~~~~d~~~~L 402 (461) T TIGR01833 323 PSLLLPTQVGNMYTASLYGCLASLLSSKSADELAGKRVGLFSYGSGLAASLFSLRVSGDASPGSILDKLIASLSDIKNKL 402 (461) T ss_pred CEEEECCCCCCCCHHHHHHHHHHHHHCCCHHHHCCCEEEEEECCHHHHHHHEEEEECCCCCCCCHHHHHHHHHHCCHHHH T ss_conf 00210005786400789999999974078013077569986362455432110145368887641455566552115777 Q ss_pred HCCCCCCHHHHHHHHH-----HCCCCCCC--CCCCCCCCCCCEEEEEEEC-CEEEEEEE Q ss_conf 4272238999999986-----30688887--6316667888669835655-38998861 Q gi|254781019|r 338 NSRIPISYQVYCDLHQ-----DIIPSVEG--NCTIPHTTTGPFRLATIQN-HKRIYETT 388 (396) Q Consensus 338 ~~r~~l~~~~y~~~~~-----~~~~~~~~--~~~~~~~~~~~~~l~~i~~-~~R~Y~~~ 388 (396) T Consensus 403 ~~R~~~~P~~f~~~m~~Re~~h~k~nf~P~k~gsi~~L~~GTyYL~~vD~~~RR~Y~~~ 461 (461) T TIGR01833 403 DSRHCLSPEEFEEAMELREQAHHKKNFTPTKEGSIESLFPGTYYLESVDSLHRRSYKRK 461 (461) T ss_pred HHHHCCCCHHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCEECCCCCHHHCCCCCCC T ss_conf 53321480889999999987303578854767770437896032021123236345789

HHsearch alignment for GI: 254781019 and conserved domain: TIGR01833