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- W2049543652 abstract "In a previous study, kinetic assays showed that pNiXa, an Ni(II)-binding serpin of Xenopus oocytes and embryos, strongly inhibits bovine chymotrypsin, weakly inhibits porcine elastase, and does not inhibit bovine trypsin. In this study, analyses by SDS-PAGE and gelatin zymography showed that an SDS-resistant complex is formed upon the interaction of pNiXa with bovine chymotrypsin. No such pNiXa–enzyme complex was detected after pNiXa interactions with porcine elastase, bovine trypsin, or human cathepsin G. The major products of pNiXa cleavage by the four proteinases were partially sequenced by Edman degradation. The cleavage products were also tested by immunoblotting with an antibody to the His-cluster of pNiXa, and by radio-blotting with 63Ni(II). These assays showed that chymotrypsin and elastase cleave pNiXa at the P1–P1′ (Thr–Lys) peptide bond near the C-terminus, while trypsin and cathepsin G cleave pNiXa at specific peptide bonds near the N-terminus, within an interesting 26-residue segment, rich in Lys and Gln, that separates the His-cluster of pNiXa from the rest of the molecule. The segment lacks homology to other serpins, but resembles a domain of Xenopus POU3 transcription factor. This study identifies the specific sites for interactions of four serine proteinases with pNiXa, indicates that pNiXa inhibition of chymotrypsin involves a serpin-like mechanism, and shows that 63Ni(II)-binds to the His-cluster of pNiXa." @default.
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- W2049543652 date "2000-05-01" @default.
- W2049543652 modified "2023-10-18" @default.
- W2049543652 title "Amyloid precursor protein binding partners in human embryonic kidney 293 cells" @default.
- W2049543652 doi "https://doi.org/10.1016/s0197-4580(00)83121-8" @default.
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