Rapid biosynthesis of N-linolenoyl-L-glutamine, an elicitor of plant volatiles, by membrane-associated enzyme(s) in Manduca sexta

Cameron G. Lait, Hans T. Alborn, Peter E.A. Teal, James H. Tumlinson

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

In response to elicitors in the oral secretions of caterpillars, plants produce and release volatile chemicals that attract predators and parasitoids of the caterpillar while it feeds. The most prevalent elicitors are fatty acid amides consisting of 18-carbon polyunsaturated fatty acids coupled with L-glutamine. We demonstrate rapid CoA- and ATP-independent in vitro biosynthesis of the fatty acid amide elicitor, N-linolenoyl-L-glutamine, by microsomal fractions of several alimentary tissues in Manduca sexta. N-linolenoyl-L-glutamine is a structural analog of several other elicitors including volicitin, the first fatty acid amide elicitor identified in caterpillars. The enzyme(s) that catalyzed biosynthesis of N-linolenoyl-L-glutamine was localized within the integral membrane protein fraction extracted from microsomes by Triton X-114 detergent phase partitioning and had maximum activity at alkaline pH. We found no evidence suggesting microbial or tissue-independent biosynthesis of N-linolenoyl-L-glutamine in M. sexta. The in vitro biosynthesis of N-linolenoyl-L-glutamine by membrane-associated enzyme(s) in M. sexta represents direct evidence of fatty acid amide synthesis by caterpillar tissues.

Original languageEnglish (US)
Pages (from-to)7027-7032
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume100
Issue number12
DOIs
StatePublished - Jun 10 2003

All Science Journal Classification (ASJC) codes

  • General

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