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Involvement of Neb-Colloostatin, a Collagen-Related Peptide, in Early Vitellogenesis of the Grey Fleshfly

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

During the purification procedure of the first folliculostatin of the grey fleshfly Neobellieria bullata, the Trypsin-Modulating Oostatic Factor (Neb-TMOF), a second factor with oostatic activity, was discovered. Here we report the primary structure and effects on oocyte development of the latter factor. The amino acid sequence was determined as H-SIVPLGLPVPIGPIVVGPR-OH. Because of structural sequence similarities with parts of several known collagens and because of its oostatic activity, we named the factor Neb-colloostatin. The synthetic peptide inhibits yolk uptake by previtellogenic oocytes and might be the factor that determines that per ovariole only one follicle develops at a time.

Affiliations: 1: Zoological Institute of the University, 3000 Leuven, Belgium; 2: Rega Institute of the University, 3000 Leuven, Belgium; 3: Faculty of Sciences, Ledeganckstraat 35, 9000 Gent, Belgium


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