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Biochemical and Biophysical Research Communications 1998-Feb

The ovary of the desert locust Schistocerca gregaria contains a glycine- and proline-rich peptide that displays sequence similarities with a new class of GPRP proteins from plants.

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L Schoofs
A Hamdaoui
B Devreese
J Van Beeumen
A De Loof

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概要

A novel, highly hydrophobic, glycine- and proline-rich peptide was characterized in the ovary of the desert locust, Schistocerca gregaria. The peptide was detected as one of the major peaks in a chromatographic separation of an acidic methanolic extract of 50 mature ovaries. Electrospray mass spectrometry yielded a molecular mass of 6305 Da. The partial amino acid sequence as determined by Edman degradation based automated microsequencing is as follows: Ala-Tyr-Pro-Ala-His-Gln-Gly-Tyr- Pro-Ala-His-Val-Gly-Tyr-Ala-Arg-Val-Gly-Tyr-Gly- Gly-Tyr-Pro-Ser-Tyr-Gly-Tyr-Pro-Ala. Four amino acids (Gly, Pro, Ala, and Tyr) account for more than 80% of the composition of this sequence. Gly-Tyr-Pro is the most important repetitive motif. Ala-Tyr-Pro, Gly-Tyr-Gly and Gly-Tyr-Ala occur as variations of this motif. The novel glycine- and proline-rich insect peptide displays structural characteristics similar to those of a new class of glycine- and proline-rich proteins (GPRP) that have recently been identified in Arabidopsis thaliana (thale cress) and Daucus carota (carrot). The GPRP of A. thaliana contains the same repetitive motifs (except for Ala-Tyr-Pro), the Gly-Tyr-Pro motif also being the most abundant.

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