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Unformatted text preview: and thus defines the amino- or N terminal end ( Fig. 4 ). The amino acid at the other end must have a free COOH group and thus defines the carboxy- or C terminal end ( Fig. 4 ). Protein sequences are conventionally written from N-terminus (at the left) to C-terminus (at the right). The peptide bonds form a zig-zag backbone, from which the side-groups (denoted R) protrude ( Fig. 5 ). The R group is different for each amino acid and determines the nature of its contribution to the overall protein structure....
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- Fall '10