BIOLOGY
AMINO ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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V + G
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C + C
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D + K
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R + H
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Detailed explanation-1: -The salt bridge most often arises from the anionic carboxylate (RCOO−) of either aspartic acid or glutamic acid and the cationic ammonium (RNH3+) from lysine or the guanidinium (RNHC(NH2)2+) of arginine (Figure 2).
Detailed explanation-2: -The side chains of aspartate and glutamate can form ionic bonds (“salt bridges”), and they can also function as hydrogen bond acceptors.
Detailed explanation-3: -In proteins, salt bridges occur between amino acid side-chains with opposite positive or negative full-electron charges, namely, (at neutral pH) Glu-or Asp-vs. Arg+ or Lys+.
Detailed explanation-4: -Salt-bridges (or ionic bonds) are the major electrostatic components involving the-NH3+ and COO-groups of the charged amino acids.