Crayfish Orconectes limosus

Bulau P, Meisen I, Schmitz T, Keller R, Peter-Katalinic J. 2004. Identification of neuropeptides from the sinus gland of the crayfish Orconectes limosus using nanoscale on-line liquid chromatography tandem mass spectrometry. Mol Cell Pro-teomics 3 558. 

Schwoch studied the synthesis of trehalose in the crayfish, Orconectes limosus. Biosynthesis of the disaccharide could be detected in the abdominal muscle, antennal gland, hind-gut, integumentary tissue, and, to a lesser extent, in the stomach tissue. The trehalose 6-phosphate synthetase was soluble and was inhibited 50 by 80 milf trehalose. The rate of synthesis of trehalose was dependent on the season, and optimal activity in abdominal muscle occurred in February and March. The label from injected [ Cjtrehalose or D-[ C]glucose was foimd to be distributed from the hemolymph into organs much faster than the label from [ C]maltose. 

Orcokinin, NEDEIDRSGF °GFN, a myo-tropic 13-peptide from the abdominal nerve cords of the crayfish Orconectes limosus). It acts as a highly potent stimulator ofhindgut contractions. More members of the orcokinin neuropeptide family have been isolated from several crustacean species [J. Stangier et al.. Peptides 1992, 13, 859 D. Bungart et al.. Peptides 1995, 16, 199 L. Li et al., J. Comp. Neurol. 2002, 444, 227]. 

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