Amino acids (special cases)
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11 Terms
Which amino acids are considered special?
Glycine, Histidine, Proline, Cysteine
What makes Cysteine special?
contains -SH group, forms disulfide bonds
What makes glycine special?
as H+ as the side chain; achiral, flexibel, disrupts alpha helices-tight turns
What makes Proline special?
side chain forms a ring with the amino group; disrupts alhpa helices - causes kinks
What makes Histidine special?
side chain pKa (6.5) is near physiological pH (7.4); exists in protonated and deprotanted forms; found in active sites of enzymes
Which amino acid is achiral
Glycine
What type of bond forms between two cysteine residues?
disulfide bonds
Which amino acid creates kinks in alpha helices?
Proline
Which amino acid is involved in acid-base catalysis in enzymes?
Histidine
Which amino acid is commonly found in Beta-turns?
Glycine