PROTEIN STRUCTURE 



Lindley (61). This does not involve proline residues. It is 

 dependent upon certain specific residue sequences and the forma- 

 tion of main-chain-side-chain hydrogen bonds. 



Fig. 8b. Exploded drawings of the regions L and R opposite. In 

 the drawings atoms of the proUne residues are in heavy outline. (1) 

 Above: region L. (2) Below: region R. The dotted outline in this 

 drawing represents the hydrogen atom which would be present — and 

 hydrogen-bonded to the oxygen beneath — if the residue were not pro- 

 line. 



413 



