Translations:Amino acid/32/en: Difference between revisions

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Message definition (Amino acid)
For amino acids with charged side chains, the p''K''<sub>a</sub> of the side chain is involved. Thus for aspartate or glutamate with negative side chains, the terminal amino group is essentially entirely in the charged form {{chem2|\sNH3+}}, but this positive charge needs to be balanced by the state with just one C-terminal carboxylate group is negatively charged. This occurs halfway between the two carboxylate p''K''<sub>a</sub> values: p''I'' = {{sfrac|1|2}}(p''K''<sub>a1</sub> + p''K''<sub>a(R)</sub>), where p''K''<sub>a(R)</sub> is the side chain p''K''<sub>a</sub>.

For amino acids with charged side chains, the pKa of the side chain is involved. Thus for aspartate or glutamate with negative side chains, the terminal amino group is essentially entirely in the charged form −NH+
3, but this positive charge needs to be balanced by the state with just one C-terminal carboxylate group is negatively charged. This occurs halfway between the two carboxylate pKa values: pI = 1/2(pKa1 + pKa(R)), where pKa(R) is the side chain pKa.

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