Sesquiterpene synthases from grand fir (Abies grandis). Comparison of constitutive and wound-induced activities, and cDNA isolation, characterization, and bacterial expression of delta-selinene synthase and gamma-humulene synthase.

The Journal of Biological Chemistry
C L SteeleR Croteau

Abstract

Grand fir (Abies grandis) has been developed as a model system for the study of oleoresin production in response to stem wounding and insect attack. The turpentine fraction of the oleoresin was shown to contain at least 38 sesquiterpenes that represent 12.5% of the turpentine, with the monoterpenes comprising the remainder. Assays of cell-free extracts from grand fir stem with farnesyl diphosphate as substrate indicated that the constitutive sesquiterpene synthases produced the same sesquiterpenes found in the oleoresin and that, in response to wounding, only two new products were synthesized, delta-cadinene and (E)-alpha-bisabolene. A similarity based cloning strategy yielded two new cDNA species from a stem cDNA library that, when expressed in Escherichia coli and the gene products subsequently assayed, yielded a remarkable number of sesquiterpene products. The encoded enzymes have been named delta-selinene synthase and gamma-humulene synthase based on the principal products formed; however, each enzyme synthesizes three major products and produces 34 and 52 total sesquiterpenes, respectively, thereby accounting for many of the sesquiterpenes of the oleoresin. The deduced amino acid sequence of the delta-selinene synthase cDN...Continue Reading

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Citations

Dec 18, 2001·Biotechnology and Bioengineering·V J MartinJ D Keasling
Nov 23, 2006·Applied Microbiology and Biotechnology·Sydnor T Withers, Jay D Keasling
Aug 13, 2009·Applied Microbiology and Biotechnology·Hisashi Harada, Norihiko Misawa
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Aug 20, 2011·Genome Biology and Evolution·Sébastien VerneKermit Ritland

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