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“Analysis of the activity of ADC in the presence of different amino determined that beta-alanine production from aspartate was diminished in the presence of cysteine.”
“This effect is suppressed by substituting the aspartates with cysteine , suggesting that protonation of these aspartates may contribute to the signaling pathway whereby external [H+] influences conformational changes in the channel's cytoplasmic domains (where deactivation takes place).”
“We infer the functional role of these aspartates by studying how substituting them with cysteine , one at a time, affects the channel function.”
“Competitive inhibition by various amino acids of l-aspartate or l-alanine in self-exchange reactions revealed that l-cysteine selectively inhibited l-aspartate self-exchange but only weakly inhibited l-alanine self-exchange.”
“The aspartate analogs l-cysteine sulfinic acid , l-cysteic acid, and d-cysteic acid competitively and strongly inhibited l-aspartate self-exchange compared with l-alanine self-exchange.”
“In particular, 13 of the 26 modifications (6 cysteine pairs and 7 disulfides) significantly increase or decrease aspartate affinity, while 15 of the 26 modifications (5 cysteine pairs and 10 disulfides) destroy transmembrane kinase regulation.”