>TIGR00532 HMG_CoA_R_NAD hydroxymethylglutaryl-CoA reductase, degradative; InterPro: IPR004553 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 class II HMG-CoA reductases, as well as some class I enzymes from archaea. This family was built from two class II NAD-dependent enzymes from organisms closely related to Pseudomonas mevalonii, a bacterium that can use mevalonate as its sole carbon source. Some archaeal HMG-CoA reductases were found to be of bacterial origin . This family is occasionally found together with a thiolase (IPR002155 from INTERPRO) to form a putative bifunctional acetyl-CoA acetyltransferase/HMG-CoA reductase protein .; GO: 0016616 oxidoreductase activity acting on the CH-OH group of donors NAD or NADP as acceptor, 0050662 coenzyme binding, 0015936 coenzyme A metabolic process.

Probab=100.00 E-value=0 Score=593.56 Aligned_cols=313 Identities=20% Similarity=0.195 Sum_probs=274.3 Q ss_pred CCCCCEEEEEEEEEEECCEEECCCCCCCCEEEEEEEHHHHHHHHHHHHHHHHHHCCCCEEEEEECCCEEEEEEE-EECCH Q ss_conf 97641037861127603756765136774788653034538999989999999559988999967922412599-85897 Q gi|255764509|r 1 MHMKKVSSISMPMRWIGPMKITGNVIQDKVKVPLATYEYPLWHSVKRGAHISMLCPDGIRATLIDERMTRSIFF-ETENA 79 (351) Q Consensus 1 m~en~IG~~~lPlGia~~l~InG~~a~~~y~VPMATeE~SvVAAas~gak~~~~~sGG~~t~~~~~~m~r~~~f-~~~~~ 79 (351) T Consensus 67 MIEN~IG~l~lP~GI~~Nl~I~GK----~Y~~P~A~EE~SVVAA~~~AA~~~-~~~~~~~~~~~~~~~~Gqiq~~~~~~~ 141 (402) T TIGR00532 67 MIENVIGYLELPLGIVKNLKIDGK----DYLLPIAIEESSVVAALSFAAKIL-READLFYSLYEVLLIIGQIQVIKLKSE 141 (402) T ss_pred HHHHEEEEEECCHHHHHHCEECCC----EEECCEEECCHHHHHHHHHHHHHH-HHCCCCEEECEEEEEEEEEEEEEECCH T ss_conf 342000012032134410223483----231320103236999999999999-745871320102245521567875273 Q ss_pred HHHHHHHHHHHHHHHHHHHHHHH-----CCCCEEEEEEEEEEEC----CEEEEEEEEEECCCCCCHHHHHHHHHHHHHHH Q ss_conf 78999997617509999999730-----1578047888878738----86999999973200672158899999999999 Q gi|255764509|r 80 EMALTALQEITLKKAEIARVIEQ-----TSQFTRFLQLHSQIAG----NLLFLRLEFATGDASGHNMVTKAADAVMDWIL 150 (351) Q Consensus 80 ~~a~~~~~~i~~~~~~i~~~a~~-----~sr~ggl~~i~~~~~g----~~v~l~~~~dt~DAMGaNmvnt~~E~v~~~i~ 150 (351) T Consensus 142 ~~~~---~~~~~~~D~I~~~~~~~~~~l~~~GGG~~~~~~Rvi~~~~~~~~~~~~~VD~~DAMGAN~~N~~~E~VA~FI~ 218 (402) T TIGR00532 142 KDLK---KIVLDLKDKIKERIEELLTNLVNLGGGFKDLEARVIDIKELKILKLNLIVDVKDAMGANLLNSIAEKVAEFIE 218 (402) T ss_pred HHHH---HHHHHCCCHHHHHHHHHHHHHHHCCCCEEEHHHHEEEEEECCEEEEEEEEECCCCCCHHHHHHHHHHHHHHHH T ss_conf 3556---6765236157778756326777458971341131010110246899999853301011268788877666675 Q ss_pred HHCCCCEEEEECCCCCHHHHHHHHHHCCCCCCEEEEEEEECHHHHHHHHCCCHHHHHHHHHHHHHHHHHCCCHHHCCCCC Q ss_conf 86798148973477431233355431037720799998756999975738999999988786656554220022021621 Q gi|255764509|r 151 SQWSYLHYGSVSGNICSDKKATAINGIMGRGKNFVAEITINRAICQKYLRTSPEKIILLNTQKNLIGTFLAGGIRSANAH 230 (351) Q Consensus 151 ~~~~~~~~~~ilsN~~tdkk~s~~n~~~~rG~~V~Ae~~i~~~~~~~~l~~~~e~~~~~~~~~~~~a~~~~~~a~t~Nkg 230 (351) T Consensus 219 ~~~G~~~~L~~~SN~~~~~ta~A------R~~~~F~~~~-----~---G~E~sWn~~~~I~L~~~~~~~~~~R~~T~NKG 284 (402) T TIGR00532 219 LIFGYKVVLKVLSNLIAEFTAKA------RAKLVFDKLL-----I---GKEDSWNLVKKIELIYAIAAADEERAVTNNKG 284 (402) T ss_pred HHCCCEEEEEEECHHHHHHHHHH------HHHEEECCCC-----C---CCCCHHHHHHHHHHHHHHHHCCCCCHHHCCCC T ss_conf 54286688753004788777650------1111101036-----8---98504788878888777743162001122785 Q ss_pred HHHHHHHHHHHCCCCHHHHHHHCCCE----------EEEE-EECCEEEEEEEECCEEEEEECCCCCC-HHHHHHHHHHCC Q ss_conf 66778888876276378888640320----------2568-72890899998056467730664468-889999986086 Q gi|255764509|r 231 FANMLLAYYLATGQDAANIVEGSQGL----------TYAK-LHDDSLYFSCTIPNLILGCVGNGKNI-PAIKNNLTALGC 298 (351) Q Consensus 231 imNgI~Av~lATGnD~a~v~a~~~a~----------t~~~-~~~~~L~g~i~lPsl~vGtVGG~t~l-p~~~~~l~ilg~ 298 (351) T Consensus 285 IMNGI~~~~~AT~ND~RA~EA~~H~yA~~~GkY~PL~~y~v~~~~~LVG~IEIP-l~VG~~GG~~~~N~~~~~SlKIl~V 363 (402) T TIGR00532 285 IMNGISALMLATFNDFRALEASVHKYAAKSGKYKPLSKYEVDRDNALVGEIEIP-LAVGVKGGVIKVNELAKLSLKILNV 363 (402) T ss_pred CHHHHHHHHHHCCCCHHHHHHHHHHHHHCCCCCCCCCEEEEECCCCEEEEEECC-CCCCCCCCEEEECHHHHHHHHHHCC T ss_conf 122257787531662567775444565437653664305662378425448624-0126316704433377766676055 Q ss_pred CCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHCCCCHHHHHHHHHC Q ss_conf 8778877698899999999998889999998807886899998726 Q gi|255764509|r 299 IEERKTGDNARRLAAICAATVLCGELSLLAAQTNPGELMEAHLRLE 344 (351) Q Consensus 299 ~~~~~~~~~A~~La~iiAavgLAqnlaal~Al~t~G~iq~gHmkl~ 344 (351) T Consensus 364 -------N~~~El~~~~~~~GLA~NFAALRALA~~G-IQ~GHM~LH 401 (402) T TIGR00532 364 -------NSKEELIRVLAALGLASNFAALRALAFEG-IQKGHMRLH 401 (402) T ss_pred -------CCHHHHHHHHHHHHHHHHHHHHHHHHHCC-CCCCCCCCC T ss_conf -------77889999999851677899999988515-221410206

HHsearch alignment for GI: 255764509 and conserved domain: TIGR00532