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| Description: A peptide bond exist in two possible configurations, trans and cis, which are related by rotation around the CCO-N bond. The trans form is usually favored because in the cis configuration the R groups on adjacent -carbons can sterically interfere. The major exception is the bond in the sequence X-Pro where X is any other amino acid. In this bond the cis configuration is sometimes allowed, although the trans configuration is still favored by about 4:1. Picture Stats: Views: 368 Filesize: 60.46kB Height: 325 Width: 865 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=33919 |