title: Amino acid sequence of CAP2b, an insect cardioacceleratory peptide from the tobacco hawkmoth Manduca sexta.
abstract: The primary structure of a novel insect neuropeptide, Cardioacceleratory Peptide 2b (CAP2b), from the tobacco hawkmoth Manduca sexta has been established using a combination of mass spectroscopy, Edman degradation microsequencing, amino acid analysis, and biological assays. The sequence of CAP2b, pyroGlu-Leu-Tyr-Ala-Phe-Pro-Arg-Val-amide, has a molecular weight of 974.6 and is blocked at both the amino and carboxyl ends. Examination of several national computer protein data bases failed to reveal other peptides or proteins with any sequence homology to CAP2b indicating that this is likely to be a novel insect neuropeptide. This peptide may be a general activator of insect viscera since it causes an increase in heart rate in Manduca and in Drosophila, and has also been implicated in the regulation of fluid secretion by the Malphigian tubules of Drosophila.
authors.affiliation: Institute of Neuroscience, University of Oregon, Eugene 97403, USA.
authors.forename: G R
authors.initials: GR
authors.lastname: Huesmann
authors.forename: C C
authors.initials: CC
authors.lastname: Cheung
authors.forename: P K
authors.initials: PK
authors.lastname: Loi
authors.forename: T D
authors.initials: TD
authors.lastname: Lee
authors.forename: K M
authors.initials: KM
authors.lastname: Swiderek
authors.forename: N J
authors.initials: NJ
authors.lastname: Tublitz
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D004330:Drosophila; D006339:Heart Rate / Q000502:physiology; D008317:Malpighian Tubules / Q000378:metabolism; D018402:Manduca / Q000737:chemistry*; D008969:Molecular Sequence Data; D009479:Neuropeptides / Q000737:chemistry* / Q000302:isolation & purification / Q000502:physiology; D009842:Oligopeptides / Q000737:chemistry* / Q000302:isolation & purification / Q000502:physiology; D011761:Pyrrolidonecarboxylic Acid / Q000031:analogs & derivatives; D013329:Structure-Activity Relationship
chemical_list: D009479:Neuropeptides; D009842:Oligopeptides; C095817:cardioacceleratory peptide 2b; D011761:Pyrrolidonecarboxylic Acid