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• W2018645065 abstract "Protein cyclic imide is the putative intermediate in the formation of sites of carboxyl-methylation in eukaryotic proteins. Conditions known to induce the formation of a cyclic imide in model peptides have been applied to a protein, calmodulin. Heating of calmodulin in the dry state at 100 degrees C for 24 h after lyophilization from a pH 2.0 or pH 6.0 solution produces derivatives with altered chromatographic properties in anion-exchange HPLC. At pH 6.0, complete activity of calmodulin was retained. Analysis with Fourier transform infrared (FTIR)-photoacoustic spectroscopy demonstrated the presence of a new structure in the calmodulin molecule consistent with modification of carboxylic acid groups. The conversion of calmodulin is dependent upon the absence of Ca2+ (the presence of 1 mM ethylene glycol bis(beta-aminoethyl ether) N,N'-tetraacetic acid). A peptide analogous to the calcium binding regions of calmodulin, Asp-Lys-Asp-Gly-Asn-Gly-Thr-Ile-Thr-Thr-Lys-Glu, is also converted, upon heating, to chromatographically different forms in reversed-phase chromatography. This process is also dependent upon the absence of calcium. Sequence analysis of the peptide derivatives reveals a second amino terminus, implicating peptide bond hydrolysis in the product. A dipeptide, Asp-Gly, known to form a cyclic imide structure under similar conditions is also hydrolyzed during sequence analysis consistent with cleavage occurring at the position of the cyclic imide structure. Asp3 is suggested to be the site of cyclic imide formation in the calmodulin peptide. The presence of a cyclic imide structure is also confirmed by the application of FTIR-photoacoustic spectroscopy. These data suggest that cyclic imide formation in calmodulin has been induced, possibly at one, or more, of the calcium binding loops of the protein. These modification reactions may provide a basis for future investigations of cyclic imide formation in proteins." @default.
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• W2018645065 date "1990-01-01" @default.
• W2018645065 modified "2023-10-18" @default.
• W2018645065 title "Formation of cyclic imide-like structures upon the treatment of calmodulin and a calmodulin peptide with heat" @default.
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• W2018645065 doi "https://doi.org/10.1016/0003-9861(90)90014-p" @default.
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