Abstract
The octapeptide AKH-G, isolated from the cricket Gryllus bimaculatus , stimulates lipid mobilization in both the cricket itself and in migratory locusts. The structure of AKH-G has been assigned by fast atom bombardment mass spectrometry (FABMS) as pGlu-Val-Asn-Phe-Ser-Thr-Gly-Trp-NH 2, and it is most closely related to AKH II-S from Schistocerca species, which has a Leu 2 unit. Synthetic AKH-G, prepared by solid phase techniques, had the same bioactivity as the natural substance. FABMS measurements, including high-resolution and metastable studies, were made employing 400–900 pmole of sample.
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