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• W63085916 endingPage "4067" @default.
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• W63085916 abstract "Externally oriented protein kinases are present on the plasma membrane of the human parasite, Leishmania. Since activation of complement plays an important role in the survival of these parasites, we examined the ability of protein kinases from Leishmania major to phosphorylate components of the human complement system. The leishmanial protein kinase-1 (LPK-1) isolated from promastigotes of L. major was able to phosphorylate purified human C3, C5 and C9. Only the alpha-chain of C3 and C5 was phosphorylated. The beta-chain appeared not to be a substrate for this enzyme. C3b which is formed by proteolytic cleavage of C3 was not phosphorylated by LPK-1. Trypsin treatment of phosphorylated C3 (P-C3) resulted in the disappearance of 32P from the alpha-chain. This was correlated with the conversion of the C3 alpha-chain to the alpha'-chain of C3b, and the appearance of a 9 kDa 32P fragment comigrating with the C3a fragment of C3. P-C3 was more resistant to cleavage by trypsin than nonphosphorylated C3. LPK-1 phosphorylated purified C3a and two synthetic peptides, C3a21R and YA-C3a10R, derived from its COOH-terminal end, which contain the C3a binding site to leukocytes and platelets. LPK-1 did not phosphorylate C3a8R. Phosphoamino acid analysis of the synthetic peptides indicated that serine 71 of C3a was phosphorylated by LPK-1. Treatment of C3 with either methylamine or freeze-thaw C3 (H2O) prevented phosphorylation by the LPK-1 suggesting that substrate conformation may be involved in recognition by the leishmanial enzyme.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
• W63085916 created "2016-06-24" @default.
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• W63085916 date "1991-12-01" @default.
• W63085916 modified "2023-09-27" @default.
• W63085916 title "Leishmanial protein kinases phosphorylate components of the complement system." @default.
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• W63085916 doi "https://doi.org/10.1002/j.1460-2075.1991.tb04982.x" @default.
• W63085916 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/453154" @default.
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