Identification of neuropeptides from the decapod crustacean sinus glands using nanoscale liquid chromatography tandem mass spectrometry.

Abstract

Neurosecretory systems are known to synthesize and secrete a diverse class of peptide hormones which regulate many physiological processes. The crustacean sinus gland (SG) is a well-defined neuroendocrine site that produces numerous hemolymph-borne agents including the most complex class of endocrine signaling molecules--neuropeptides. As an ongoing effort to define the peptidome of the crustacean SG, we determine the neuropeptide complements of the SG of the Jonah crab, Cancer borealis, and the Maine lobster, Homarus americanus, using nanoflow liquid chromatography electrospray ionization quadrupole time-of-flight (ESI-QTOF) MS/MS. Numerous neuropeptides were identified, including orcokinins, orcomyotropin, crustacean hyperglycemic hormone (CHH), CHH precursor-related peptides (CPRPs), red pigment concentrating hormone (RPCH), beta-pigment dispersing hormone (beta-PDH), proctolin and HL/IGSL/IYRamide. Among them, two novel orcokinins were de novo sequenced from the SG of H. americanus. Three CPRPs including a novel isoform were sequenced in H. americanus. Four new CPRPs were sequenced from the SG of C. borealis. Our results show that structural polymorphisms in CPRPs (and thus the CHH precursors) are common in Dendrobranchiata as well as in Pleocyemata. The evolutionary relationship between the CPRPs is also discussed.

• Authors: Qiang Fu, Michael F Goy, Lingjun Li
• Journal: Biochemical and biophysical research communications (Biochem Biophys Res Commun) Vol. 337 Issue 3 Pg. 765-78 (Nov 25 2005) ISSN: 0006-291X [Print] United States
• PMID: 16214114 (Publication Type: Comparative Study, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)

Chemical References

• Neuropeptides

Topics

• Amino Acid Sequence
• Animals
• Brachyura (metabolism)
• Chromatography, Liquid (methods)
• Gene Expression Profiling (methods)
• Microchemistry (methods)
• Molecular Sequence Data
• Nanotechnology (methods)
• Nephropidae (metabolism)
• Neuropeptides (analysis, chemistry)
• Neurosecretory Systems (metabolism)
• Peptide Mapping (methods)
• Sequence Analysis, Protein (methods)
• Species Specificity
• Spectrometry, Mass, Electrospray Ionization (methods)