Holman GM, Cook BJ, Wagner RM. Isolation and partial characterization of five myotropic peptides present in head extracts of the cockroach Leucophaea maderae.
Comp Biochem Physiol C Comp Pharmacol Toxicol 1984;
77:1-5. [PMID:
6141862 DOI:
10.1016/0742-8413(84)90122-1]
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Abstract
Five peptides were isolated by reverse-phase HPLC from head extracts of the cockroach Leucophaea maderae. Four of the peptides were inactivated by aminopeptidase M (APM). The inability of APM to digest the fifth peptide suggests a blocked NH2-terminus. Four of the peptides were inactivated by carboxypeptidase Y (CPY). The activity of the fraction which would have contained proctolin was decreased by about 20%. The complete deactivation of proctolin by CPY indicated that a second peptide, co-eluting with proctolin but refractory to CPY digestion, was responsible for 80% of the biological activity in that fraction. Concentrations of the peptides necessary to produce a threshold response from the isolated cockroach hindgut ranged from 0.009 to 0.083 head equivalents/ml.
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