>TIGR00920 2A060605 3-hydroxy-3-methylglutaryl-coenzyme A reductase; InterPro: IPR004816 Synonym(s): 3-hydroxy-3-methylglutaryl-coenzyme A reductase, HMG-CoA reductase. There are two distinct classes of hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase enzymes: class I consists of eukaryotic and most archaeal enzymes (1.1.1.34 from EC), while class II consists of prokaryotic enzymes (1.1.1.88 from EC) , . Class I HMG-CoA reductases catalyse the NADP-dependent synthesis of mevalonate from 3-hydroxy-3-methylglutaryl-CoA (HMG-CoA). In vertebrates, membrane-bound HMG-CoA reductase is the rate-limiting enzyme in the biosynthesis of cholesterol and other isoprenoids. In plants, mevalonate is the precursor of all isoprenoid compounds . The reduction of HMG-CoA to mevalonate is regulated by feedback inhibition by sterols and non-sterol metabolites derived from mevalonate, including cholesterol. In archaea, HMG-CoA reductase is a cytoplasmic enzyme involved in the biosynthesis of the isoprenoids side chains of lipids . Class I HMG-CoA reductases consist of an N-terminal membrane domain (lacking in archaeal enzymes), and a C-terminal catalytic region. The catalytic region can be subdivided into three domains: an N-domain (N-terminal), a large L-domain, and a small S-domain (inserted within the L-domain). The L-domain binds the substrate, while the S-domain binds NADP. Class II HMG-CoA reductases catalyse the reverse reaction of class I enzymes, namely the NAD-dependent synthesis of HMG-CoA from mevalonate and CoA . Some bacteria, such as Pseudomonas mevalonii, can use mevalonate as the sole carbon source. Class II enzymes lack a membrane domain. Their catalytic region is structurally related to that of class I enzymes, but it consists of only two domains: a large L-domain and a small S-domain (inserted within the L-domain). As with class I enzymes, the L-domain binds substrate, but the S-domain binds NAD (instead of NADP in class I). This entry represents Metazoan class I HMG-CoA reductases, which are membrane-bound glycoproteins that remains in the endoplasmic reticulum after synthesis and glycosylation .; GO: 0004420 hydroxymethylglutaryl-CoA reductase (NADPH) activity, 0050661 NADP binding, 0008299 isoprenoid biosynthetic process, 0005789 endoplasmic reticulum membrane.

Probab=100.00 E-value=0 Score=762.88 Aligned_cols=342 Identities=36% Similarity=0.564 Sum_probs=332.1 Q ss_pred CCCEEEEEEEEEEECCEEECCCCCCCCEEEEEEEHHHHHHHHHHHHHHHHHHCCCCEEEEEECCCEEEEEEEEECCHHHH Q ss_conf 64103786112760375676513677478865303453899998999999955998899996792241259985897789 Q gi|255764509|r 3 MKKVSSISMPMRWIGPMKITGNVIQDKVKVPLATYEYPLWHSVKRGAHISMLCPDGIRATLIDERMTRSIFFETENAEMA 82 (351) Q Consensus 3 en~IG~~~lPlGia~~l~InG~~a~~~y~VPMATeE~SvVAAas~gak~~~~~sGG~~t~~~~~~m~r~~~f~~~~~~~a 82 (351) T Consensus 600 ENViGYmPiPVGvAGPLlLDG~----~y~VPmATTEGcLVASTNRGcrA-l~~~GGv~S~v~~dGMTRGPvVRlP~~~~A 674 (988) T TIGR00920 600 ENVIGYMPIPVGVAGPLLLDGK----EYQVPMATTEGCLVASTNRGCRA-LMLGGGVRSRVLADGMTRGPVVRLPSAARA 674 (988) T ss_pred CCCCCCCCCCCCCCCCCCCCCC----EEEECCCHHCCHHHHHHHHHHHH-HHCCCCEEEEEEECCCCCCCCCCCCCHHHH T ss_conf 0414521424555466102886----47745711013144213357898-641788389997058643650068875018 Q ss_pred HHHHHHHH--HHHHHHHHHHHHCCCCEEEEEEEEEEECCEEEEEEEEEECCCCCCHHHHHHHHHHHHHHHHHCCCCEEEE Q ss_conf 99997617--5099999997301578047888878738869999999732006721588999999999998679814897 Q gi|255764509|r 83 LTALQEIT--LKKAEIARVIEQTSQFTRFLQLHSQIAGNLLFLRLEFATGDASGHNMVTKAADAVMDWILSQWSYLHYGS 160 (351) Q Consensus 83 ~~~~~~i~--~~~~~i~~~a~~~sr~ggl~~i~~~~~g~~v~l~~~~dt~DAMGaNmvnt~~E~v~~~i~~~~~~~~~~~ 160 (351) T Consensus 675 ae~k~Wle~penF~~iK~~FDSTSRFArL~~~h~~~aGR~LyiRF~a~TGDaMGMNMiSKgte~AL~~lq~~FPdm~Ils 754 (988) T TIGR00920 675 AEVKAWLEVPENFAVIKDAFDSTSRFARLKKIHIAVAGRNLYIRFQAKTGDAMGMNMISKGTEQALAELQEVFPDMEILS 754 (988) T ss_pred HHHHHHHCCCCCHHHHHHCCCCCCHHHHHHHHHHEECCCCEEEEEEECCCCCCCCCHHHHHHHHHHHHHHHHCCCEEEEE T ss_conf 99988504843338885215764313555221000027640365453047866631022889999999875488808964 Q ss_pred ECCCCCHHHHHHHHHHCCCCCCEEEEEEEECHHHHHHHHCCCHHHHHHHHHHHHHHHHHCCCHHHCCCCCHHHHHHHHHH Q ss_conf 34774312333554310377207999987569999757389999999887866565542200220216216677888887 Q gi|255764509|r 161 VSGNICSDKKATAINGIMGRGKNFVAEITINRAICQKYLRTSPEKIILLNTQKNLIGTFLAGGIRSANAHFANMLLAYYL 240 (351) Q Consensus 161 ilsN~~tdkk~s~~n~~~~rG~~V~Ae~~i~~~~~~~~l~~~~e~~~~~~~~~~~~a~~~~~~a~t~NkgimNgI~Av~l 240 (351) T Consensus 755 lSGNyCTDKKPAAiNWIeGRGK~VVcEA~ipA~~vr~VLKTs~~ALvdvNi~KNl~GSAmAGSIGG~NAHAANiVTAiyi 834 (988) T TIGR00920 755 LSGNYCTDKKPAAINWIEGRGKSVVCEAIIPAKIVRSVLKTSAEALVDVNINKNLVGSAMAGSIGGFNAHAANIVTAIYI 834 (988) T ss_pred ECCCCCCCCCCCEEEEECCCCCCEEEEEECCHHHHHHHHCCCHHHHHHHHHHCCCCCEEEECCCCCHHHHHHHHHHHHHH T ss_conf 03661568851101012168970698773463786455211078999851103862012100113156788889989986 Q ss_pred HCCCCHHHHHHHCCCEEEEEE---ECCEEEEEEEECCEEEEEECCCCCCHHHHHHHHHHCCCCCC--CCCCCHHHHHHHH Q ss_conf 627637888864032025687---28908999980564677306644688899999860868778--8776988999999 Q gi|255764509|r 241 ATGQDAANIVEGSQGLTYAKL---HDDSLYFSCTIPNLILGCVGNGKNIPAIKNNLTALGCIEER--KTGDNARRLAAIC 315 (351) Q Consensus 241 ATGnD~a~v~a~~~a~t~~~~---~~~~L~g~i~lPsl~vGtVGG~t~lp~~~~~l~ilg~~~~~--~~~~~A~~La~ii 315 (351) T Consensus 835 AtGQDaAQNVgSSNC~TlME~~Gp~~~DLY~SCTMPSiEiGTVGGGT~LpPQ~ACL~MLGV~GA~~~~PG~NA~~LArIV 914 (988) T TIGR00920 835 ATGQDAAQNVGSSNCMTLMEAWGPTGEDLYISCTMPSIEIGTVGGGTVLPPQSACLQMLGVRGANETRPGENAKQLARIV 914 (988) T ss_pred HCCCCHHHHHHHHHHHHCCCCCCCCCCCEEEECCCCCEEEEECCCCCCCCHHHHHHHHCCCCCCCCCCCCHHHHHHHHHH T ss_conf 41787335201123233015788688860476047741442046766771478999740664556788735477761466 Q ss_pred HHHHHHHHHHHHHHHCCCCHHHHHHHHHCCCCCCC Q ss_conf 99998889999998807886899998726033677 Q gi|255764509|r 316 AATVLCGELSLLAAQTNPGELMEAHLRLERMHLNG 350 (351) Q Consensus 316 AavgLAqnlaal~Al~t~G~iq~gHmkl~R~~~~~ 350 (351) T Consensus 915 C~TVmAGELSLMaALaa-GhLVKSHM~HNRS~i~~ 948 (988) T TIGR00920 915 CATVMAGELSLMAALAA-GHLVKSHMRHNRSSINL 948 (988) T ss_pred HHHHHHHHHHHHHHHHH-CCCCHHCCCCCCHHHCC T ss_conf 55666768989999972-34101024002012200

HHsearch alignment for GI: 255764509 and conserved domain: TIGR00920