Polypeptide Structure

Table 9.2 Polypeptide Structure Level Description Stabilized by Example: Hemoglobin Primary The sequence of amino Peptide bonds W acids in a polypeptide ’SAEAAAAEQW """"Egiagfian*';;*fg;r;gi:“c;;*;aa’*'* ” 'gyaigg‘ga‘ggaaigg B-pleated sheets in a poly— between groups along the One a-helix peptide (thus, depends on peptide-bonded backbone primary structures) One of WWWWWW W WW WWW WWW W W WW WW WWWWWW WWWWW WWWW W WWWWW hemoglobin’s Tertiary Overall three-dimensional Bonds and other interac- subunits shape of a polypeptide tions between R-groups, or (includes contribution from between R-groups and the secondary structures) peptide-bonded backbone » ( _ Hemoglobin Quaternary Shape produced by Bonds and other interac— ‘ ' - . ‘ . f 23:33: combinations of polypep— tions between R-groups, polypeptide tides (each with its own and between peptide subunits tertiary structure) backbones of different polypeptides