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- W1536375200 abstract "Annexin II, a major cytoplasmic substrate of the src tyrosine kinase, is a member of the annexin family of Ca2+/phospholipid-binding proteins. It is composed of a short N-terminal tail (30 residues) followed by four so-called annexin repeats (each 70-80 residues in length) which share sequence homologies and are thought to form (a) new type(s) of Ca(2+)-binding site(s). We have produced wild-type and site specifically mutated annexin II molecules to compare their structure and biochemistry. The recombinant wild-type annexin II displays biochemical and spectroscopical properties resembling those of the authentic protein purified from mammalian cells. In particular, it shows the Ca(2+)-induced blue shift in fluorescence emission which is typical for this annexin. Replacement of the single tryptophan in annexin II (Trp-212) by a phenylalanine abolishes the fluorescence signal and allows the unambiguous assignment of the Ca(2+)-sensitive spectroscopic properties to Trp-212. This residue is located in the third annexin repeat in a highly conserved stretch of 17 amino acids which are also found in the other repeats and known as the endonexin fold. To study the precise architecture of the Ca2+ site which must reside in close proximity to Trp-212, we changed several residues of the endonexin fold in repeat 3 by site-directed mutagenesis. An analysis of these mutants by fluorescence spectroscopy and Ca(2+)-dependent phospholipid binding reveals that Gly-206 and Thr-207 seem indispensible for a correct folding of this Ca(2+)-binding site." @default.
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- W1536375200 date "1991-08-01" @default.
- W1536375200 modified "2023-09-26" @default.
- W1536375200 title "Characterization of a Ca(2+)-binding site in human annexin II by site-directed mutagenesis" @default.
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- W1536375200 doi "https://doi.org/10.1016/s0021-9258(18)98748-x" @default.
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