Histone proteins are rich in which of the following amino acids?: (A) Histidine and lysine, (B) Lysine and Arginine, (C) Arginine and Histidine, (D) Histidine and Valine
Answer is B. Histone proteins: Rich in positively charged amino acids, lysine and arginine. Carboxyl terminal 2/3rd of histone molecules are hydrophobic, Amino terminal 1/3rd are paicularly rich in basic amino acids. These amino terminal end protrude out of the octamer and is known as histone tail. Amino acids of histone tail undergo post-translational modifications.