>gnl|CDD|173830 cd00385, Isoprenoid_Biosyn_C1, Isoprenoid Biosynthesis enzymes, Class 1. Superfamily of trans-isoprenyl diphosphate synthases (IPPS) and class I terpene cyclases which either synthesis geranyl/farnesyl diphosphates (GPP/FPP) or longer chained products from isoprene precursors, isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP), or use geranyl (C10)-, farnesyl (C15)-, or geranylgeranyl (C20)-diphosphate as substrate. These enzymes produce a myriad of precursors for such end products as steroids, cholesterol, sesquiterpenes, heme, carotenoids, retinoids, and diterpenes; and are widely distributed among archaea, bacteria, and eukaryota.The enzymes in this superfamily share the same 'isoprenoid synthase fold' and include several subgroups. The head-to-tail (HT) IPPS catalyze the successive 1'-4 condensation of the 5-carbon IPP to the growing isoprene chain to form linear, all-trans, C10-, C15-, C20- C25-, C30-, C35-, C40-, C45-, or C50-isoprenoid diphosphates. Cyclic monoterpenes, diterpenes, and sesquiterpenes, are formed from their respective linear isoprenoid diphosphates by class I terpene cyclases. The head-to-head (HH) IPPS catalyze the successive 1'-1 condensation of 2 farnesyl or 2 geranylgeranyl isoprenoid diphosphates. Cyclization of these 30- and 40-carbon linear forms are catalyzed by class II cyclases. Both the isoprenoid chain elongation reactions and the class I terpene cyclization reactions proceed via electrophilic alkylations in which a new carbon-carbon single bond is generated through interaction between a highly reactive electron-deficient allylic carbocation and an electron-rich carbon-carbon double bond. The catalytic site consists of a large central cavity formed by mostly antiparallel alpha helices with two aspartate-rich regions located on opposite walls. These residues mediate binding of prenyl phosphates via bridging Mg2+ ions, inducing proposed conformational changes that close the active site to solvent, stabilizing reactive carbocation intermediates. Generally, the enzymes in this family exhibit an all-trans reaction pathway, an exception, is the cis-trans terpene cyclase, trichodiene synthase. Mechanistically and structurally distinct, class II terpene cyclases and cis-IPPS are not included in this CD. Length = 243

 Score =  144 bits (366), Expect = 2e-35
 Identities = 73/209 (34%), Positives = 102/209 (48%), Gaps = 20/209 (9%)

Query: 45  LRPMLTLATALMLEYRGDNHVLLACAIEFIHTATLLHDDVVDDSALRRGKVAARLV---W 101
            RP+  L               L  A+E +H A+L+HDD+VDDS  RRG   A L     
Sbjct: 1   FRPLAVLLEPEASR--------LRAAVEKLHAASLVHDDIVDDSGTRRGLPTAHLAVAID 52

Query: 102 GNQTSVLVGDFLLSQAFCMVIETKSQEALEALSLVACTLAEGELRQLSLSKNLDVTEEDY 161
           G   ++L GD LL+ AF  +    S EALE L+     L EG+L  L   +    T E+Y
Sbjct: 53  GLPEAILAGDLLLADAFEELAREGSPEALEILAEALLDLLEGQLLDLKWRREYVPTLEEY 112

Query: 162 LHVIKSKTAVLFSAALEVSSLIAGVQNSVRQALKSYGMNLGIAFQLVDDVLDYRGEVNEM 221
           L   + KTA L  A   + + ++G +  + +AL+  G  LG+AFQL +D+LDY G+    
Sbjct: 113 LEYCRYKTAGLVGALCLLGAGLSGGEAELLEALRKLGRALGLAFQLTNDLLDYEGDAERG 172

Query: 222 GKNIGEDFRNGKPTLPVILAFQRGTKREK 250
                     GK TLPV+ A + G   E 
Sbjct: 173 ---------EGKCTLPVLYALEYGVPAED 192