Q
how to know how many pks an amino acid has
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To determine how many pKs (dissociation constants) an amino acid has, first recognize that each amino acid contains at least two groups that can be ionized: the amino group (NH3+) and the carboxyl group (COOH). These groups give rise to two pK values, one for the ionization of the carboxyl group (pKa1) and one for the amino group (pKa2). However, if the amino acid has an ionizable side chain, such as in the cases of lysine, arginine, aspartic acid, glutamic acid, tyrosine, cysteine, and histidine, it will have an additional pK value associated with the side chain (pKa3). Therefore, most amino acids will have at least two pK values, whereas those with ionizable side chains will have three. To find the specific pK values, consult biochemical data tables or literature, as they are experimentally determined and vary slightly between amino acids due to differences in their R-groups.
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