title: Acyl-CoA Z9- and Z10-desaturase genes from a New Zealand leafroller moth species, Planotortrix octo.
abstract: Two cDNAs encoding acyl-CoA Z9-desaturase from the fat body and Z10-desaturase from the pheromone gland of the greenhead leafroller moth, Planotortrix octo, were obtained by RACE PCR. The Z9-desaturase (Pocto-Z9) cDNA spans 2291 nt with an ORF encoding a 352 amino-acid protein, which has 65% identity to Trichoplusia ni Delta 9 desaturase (Tni-Z9). The Z10-desaturase (Pocto-Z10) cDNA spans 2777 nt with an ORF encoding a protein with 356 amino acids. Pocto-Z10 shows lower identity to Pocto-Z9 and Tni-Z9 (48 and 46%, respectively) and relatively higher identity to the Delta 11 desaturases of T. ni and Helicoverpa zea (57 and 56%, respectively). The ORFs of these two P. octo cDNAs were constructed into an expression vector, YEpOLEX, that complemented the unsaturated fatty acid (UFA) auxotrophy of a desaturase-deficient ole1 strain of Saccharomyces cerevisiae. Expression of Pocto-Z9 produced a 5:2 ratio of Z9-16 and Z9-18 acids, with minor amounts (<4%) of Z9-14, Z9-15, and Z9-17 acids. Pocto-Z10 was successfully expressed in the YEpOLEX system when complemented with Z11-18:Me, and the major desaturase product proved to be Z10-16:Acid. The results confirm the regio- and stereo-selectivity of this unusual Delta 10 desaturase.
authors.affiliation: Department of Entomology, New York State Agricultural Experiment Station, Cornell University, 14456, Geneva, NY, USA
authors.forename: G
authors.initials: G
authors.lastname: Hao
authors.forename: W
authors.initials: W
authors.lastname: Liu
authors.forename: M
authors.initials: M
authors.lastname: O'Connor
authors.forename: W l
authors.initials: Wl
authors.lastname: Roelofs
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018076:DNA, Complementary; D044943:Fatty Acid Desaturases / Q000235:genetics* / Q000378:metabolism; D005260:Female; D008969:Molecular Sequence Data; D009036:Moths / Q000201:enzymology* / Q000235:genetics; D009520:New Zealand
chemical_list: D018076:DNA, Complementary; D044943:Fatty Acid Desaturases; C467901:acyl-CoA delta10-desaturase; C467900:acyl-CoA delta9-desaturase