colloblasts |
Colon and small intestine-specific cysteine-rich protein |
Oxidative stress regulated gene-b |
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This factor (SIVPLGLPVPIGPIVVGPR) is a cleaved product of a collagen-like precursor molecule and has been identified by Bylemans et al (1995) in the grey fleshfly Neobellieria bullata (hence the designation: Neb-colloostatin). The synthetic peptide inhibits yolk uptake by previtellogenic oocytes and might have a role in the absence of yolk deposition in penultimate oocytes. Neb-colloostatin does not inhibit trypsin biosynthesis in the gut or ecdysone biosynthesis by larval ring glands. It decreases vitellogenin concentrations in the hemolymph.
The peptide also potently inhibits ovarian development and terminal oocyte
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