>cd00685 Trans_IPPS_HT Trans-Isoprenyl Diphosphate Synthases (Trans_IPPS), head-to-tail (HT) (1'-4) condensation reactions. This CD includes all-trans (E)-isoprenyl diphosphate synthases which synthesis various chain length (C10, C15, C20, C25, C30, C35, C40, C45, and C50) linear isoprenyl diphosphates from precursors, isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). They catalyze the successive 1'-4 condensation of the 5-carbon IPP to allylic substrates geranyl-, farnesyl-, or geranylgeranyl-diphosphate. Isoprenoid chain elongation 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 (DDXX(XX)D) located on opposite walls. These residues mediate binding of pre

Probab=95.53 E-value=0.2 Score=28.69 Aligned_cols=135 Identities=18% Similarity=0.201 Sum_probs=80.7 Q ss_pred HHHHHHHHHHHHCCCCC--CCCHHHHHHHHHHHHHHHHHHHHHH---CCCC---CHHHHHHHHHHHHHHHHHHHHHHCC- Q ss_conf 99999999985305888--8998999998644337999999984---0343---0345576688999999899887224- Q gi|254780161|r 116 YFLDMIEAHFFDSYNDS--IFDCKQFEHYAFRISSRLIHLATMI---LDSE---RYSASLRVIKYAGIAQFIGQLICQL- 186 (299) Q Consensus 116 ~l~~lid~~~~Dl~~~~--~~t~~~L~~Y~~~~ag~vg~l~~~i---~~~~---~~~~~~~~a~~lG~A~ql~niLRdi- 186 (299) T Consensus 116 ~~~~~~~Gq~~d~~~~~~~~~~~~~y~~~~~~KTa~l~~~~~~~ga~~~~~~~~~~~~l~~~g~~lG~aFQi~DD~ld~~ 195 (298) T cd00685 116 AILELVEGQLLDLLSEYDTDVTEEEYLRIIRLKTAALFAAAPLLGALLAGADEEEAEALKRFGRNLGLAFQIQDDILDLF 195 (298) T ss_pred HHHHHHHHHHHHHHCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHCC T ss_conf 99999888899986378999999999999999999999999999999839999999999999887689999999987422 Q ss_pred ----------HHHHHCCCCCCCHHHHHHCCCCHH-HHH---CCCCC-HHH---HHH------HHHHHHHHHHHHHHHHHH Q ss_conf ----------787634887346789996399977-852---46899-879---999------999999999999999964 Q gi|254780161|r 187 ----------PIHYHRGQLYFPLDILGAVGLDRE-SFL---SGQNS-DRI---SLA------IKIFAELGLKYLFKAREE 242 (299) Q Consensus 187 ----------~~d~~~gr~yLP~~~l~~~gv~~e-~l~---~~~~~-~~~---~~~------~~~~~~~A~~~l~~a~~~ 242 (299) T Consensus 196 g~~~~~GK~~g~Dl~eGk~Tlp~i~al~~~~~~~~~~~~~~~~~~~~~~~~~v~~~i~~~g~~~~a~~~~~~~~~~A~~~ 275 (298) T cd00685 196 GDPETLGKPVGSDLREGKCTLPVLLALERAPPEQRLLLELLLGKGDEEDVEEARALVKKSGGIEYARELAREYEEKALEA 275 (298) T ss_pred CCHHHHCCCCCCHHHCCCCHHHHHHHHHHCCHHHHHHHHHHHCCCCHHHHHHHHHHHHHCCHHHHHHHHHHHHHHHHHHH T ss_conf 89788599843166569840999999987998779999986168999999999999998696999999999999999999 Q ss_pred HHHCCHHH Q ss_conf 45289999 Q gi|254780161|r 243 MRYILPDV 250 (299) Q Consensus 243 ~~~lp~~~ 250 (299) T Consensus 276 L~~l~~~~ 283 (298) T cd00685 276 LKALPESP 283 (298) T ss_pred HHCCCCCH T ss_conf 87399978

HHsearch alignment for GI: 254780161 and conserved domain: cd00685