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Dissociation Studies of Alkali Metal Cation Complexes of Aspartic Acid, Glutamic Acid, Asparagine, and Glutamine

机译:天冬氨酸,谷氨酸,天冬酰胺和谷氨酰胺碱金属阳离子络合物的解离研究

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The enzymatic transfer of Na~(+) and K~(+) across cellular membranes is necessary for maintenance of cellular function. Quantitative information about metal cation binding to amino acids should help our understanding of interactions associated with this process, particularly in the Na~(+)-K~(+)-ATPase enzyme. Another significant biological process is the deamidation of proteins, which occurs most prominently at asparaginyl residues. In fact, the deamidation of asparagine is the most commonly observed form of post-translational protein modification. This spontaneous process plays both productive and destructive roles in protein processing and has been linked to a number of degenerative diseases. We have found that the Na~(+)(Asn) complex undergoes deamidation to form Na~(+)-bound 3-amino succinic anhydride, Na~(+)(a-SA), the direct analogue of the physiologically relevant intermediates formed by deamidation. Therefore, analysis of the deamidation process observed in the Na~(+)(Asn) system has valuable biological implications.
机译:在细胞膜穿过细胞膜的酶转移是维持细胞功能所必需的。关于金属阳离子结合到氨基酸的定量信息应该帮助我们的与此方法中特别以Na〜(+)相关联的,相互作用的了解 - K〜(+) - ATP酶的酶。另一种显着的生物学过程是蛋白质的脱染,其在浅氨氨基氨基残基中最突出地发生。事实上,天冬酰胺的脱酰胺是最常见的翻译后蛋白质改性形式。这种自发过程在蛋白质加工中起着生产性和破坏性的作用,并与许多退行性疾病联系起来。我们发现Na〜(+)(ASN)复合物经历脱酰胺以形成Na〜(+) - 结合的3-氨基琥珀酸酐,Na〜(+)(A-SA),生理相关的中间体的直接类似物通过脱染形成。因此,在NA〜(+)(ASN)系统中观察到的脱酰胺方法的分析具有有价值的生物学意义。

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