>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=99.89 E-value=6.7e-22 Score=162.99 Aligned_cols=307 Identities=17% Similarity=0.199 Sum_probs=218.3 Q ss_pred CCCCEEEEEEEEECCCCCCCHHHHHHHHCCCHHHEEECCCCCEEEEECCCCCHHHHHHHHHHHHHHHCCCCCCCCCEEEE Q ss_conf 66620999999735886138889998809997683111475088994898879999999999986430132223442588 Q gi|254780489|r 2 IKSSSCILGFGHAVPNQCIHNSIIERHLNLKLGVIEQKTGIKYRYWAEKHETLTDIAIQAGDIALRNANIKKDSISLTLL 81 (325) Q Consensus 2 ~~~~~~I~g~g~~lP~~~i~n~~l~~~~~~~~~~i~~~tGI~~R~~~~~~e~~~~la~~Aa~~aL~~a~~~~~dId~ii~ 81 (325) T Consensus 1 ~p~dVGI~al~~yfP~~yV~Q~~LE~yDgVs~GKYTiGLGq~~mgFc~drEDI~Sl~LTvv~~L~er~~id~~~IGRLEV 80 (461) T TIGR01833 1 WPKDVGILALEIYFPSQYVDQAELEKYDGVSAGKYTIGLGQTKMGFCTDREDINSLCLTVVSKLMERYQIDYNKIGRLEV 80 (461) T ss_pred CCCCCEEEEEEEECCCCCCCHHHHHHHCCCCCCCEEECCCCCCCEEECCCCHHHHHHHHHHHHHHHHHCCCCCCCCEEEC T ss_conf 98874068888636887526577863268888950342356620000221015666589999999860787154311010 Q ss_pred EEEEECCCCCCCCC---CCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCC---CEEEEEEECCCCCCCCCCCCCC Q ss_conf 43100236887432---21121002386333421012310125676578874388---5058862012244446222443 Q gi|254780489|r 82 ATSTPDHLLPPSSP---LITHRLGLMQSGAIDLTGACAGFLYALVMADSYINSHQ---KPVLIIAANLLSRRINLEDKDT 155 (325) Q Consensus 82 ~s~t~d~~~P~~a~---~v~~~Lg~~~~~~~di~~~C~g~l~aL~~A~~~i~~g~---~~vLVv~~e~~S~~~d~~d~~~ 155 (325) T Consensus 81 GTETiiDKSKSVKtVLMQLF~~sGNTDvEGiDt~NACYGGTaALFNa~~WiESssWDGRyalVVagDiA--vYa~G~--A 156 (461) T TIGR01833 81 GTETIIDKSKSVKTVLMQLFEESGNTDVEGIDTVNACYGGTAALFNAINWIESSSWDGRYALVVAGDIA--VYAKGN--A 156 (461) T ss_pred CCEEEEECHHHHHHHHHHHHHHCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHCCCCCCCCEEEEEEEEE--ECCCCC--C T ss_conf 425341001035577677542057954353255341122479997545432126753034124532111--348889--8 Q ss_pred CCCCCCCEEEEEECCC-CCCCCCCCEEEEEEECCCCCCEEEEECCCCCCCCCCCCCCCCCCCCCCHHHHHHHCC-----C Q ss_conf 4325442001122057-654445311355321367765278306986676544556552322451454343201-----0 Q gi|254780489|r 156 AIIFGDAAGAVVLAPS-PLKDKSGILGIELTSDGSKYDLIKIPTGGSTSPAGTNTHDFYMRITNGADIFYNAVK-----I 229 (325) Q Consensus 156 ~~lfGDgA~A~il~~~-~~~~~~~il~~~~~s~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~g~~v~~~~~~-----~ 229 (325) T Consensus 157 RPTGGAGavAmLiGp~APivfe~glR~shM~HaYDFY----KPdL~SEYP~VDGk----lS~----~CYl~ALD~cY~~y 224 (461) T TIGR01833 157 RPTGGAGAVAMLIGPNAPIVFERGLRASHMQHAYDFY----KPDLASEYPVVDGK----LSI----QCYLSALDRCYKSY 224 (461) T ss_pred CCCHHHHHHHHHHCCCCCEEECCCCCHHHHCCCCCCC----CCCCCCCCCEECCC----CCH----HHHHHHHHHHHHHH T ss_conf 8752899999975689888742775412221453336----88883168504453----058----78998988888998 Q ss_pred HHHHHHHHH---HH-HCCCCCCCCEEEECCCCCHHHHH-HHHHC------------------------CC---------C Q ss_conf 036789889---97-40120012246305654138999-99971------------------------97---------8 Q gi|254780489|r 230 MAQSAKQSL---RK-SDLQPQDINRFIPHQANSRIIQK-VCEKI------------------------GL---------S 271 (325) Q Consensus 230 ~~~~i~~~l---~~-~gl~~~did~~i~Hq~~~~~~~~-~~~~l------------------------gi---------~ 271 (325) T Consensus 225 ~~K~~~~~~~~~~~~~~f~l~~~dy~vFH~PyCKlVqKS~ARLlyNDF~~~~~~~~~~~~~~~~~~l~~l~~~~ty~drd 304 (461) T TIGR01833 225 CKKIEKQLGKSGKDGRKFTLDDFDYMVFHSPYCKLVQKSLARLLYNDFLANPSSETDTALYEVLEALSTLKLEDTYTDRD 304 (461) T ss_pred HHHHHHHHHCCCCCCCCCCHHHCCEEEEECCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHCCHH T ss_conf 88899874202446763306344736750773226899999998888763223445566666677653377112002325 Q ss_pred HHHH--------------HH--HHHHCCCCCCCHHHHHHHHHHHHCCCC--CCCEEEEEEECCCCCCCCCC Q ss_conf 6570--------------02--185409330005999999999806789--99899999861551020101 Q gi|254780489|r 272 KRIM--------------VN--SLKDFGNSSSASIPLSLSLENQRKPFQ--KGEKILTISCRRGNDRGIYC 324 (325) Q Consensus 272 ~~~~--------------~~--~l~~~GN~~sAsi~~~L~~~~~~g~i~--~Gd~vll~~~G~G~s~ga~l 324 (325) T Consensus 305 ~EK~~~~~sk~~f~~k~~~Sl~~~~~~GNMYT~SlYg~laSLL~~~~~~eLaGkRv~~FSYGSGlAAs~FS 375 (461) T TIGR01833 305 LEKAFMKISKELFDKKVKPSLLLPTQVGNMYTASLYGCLASLLSSKSADELAGKRVGLFSYGSGLAASLFS 375 (461) T ss_pred HHHHHHHHHHHHHHHHCCCEEEECCCCCCCCHHHHHHHHHHHHHCCCHHHHCCCEEEEEECCHHHHHHHEE T ss_conf 88999999999886102000210005786400789999999974078013077569986362455432110

HHsearch alignment for GI: 254780489 and conserved domain: TIGR01833