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Environmental Studies

By P. Karlson (Auth.)

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Methionine (α-amino-y-methylmercaptobutyrate). Methionine may be looked upon as a methylation product of homocysteine and aside from its role as a protein constituent and as an essential amino acid, is also important as a donor of active methyl groups. COO ® 0 I H N-C-H 0 I Θ H N-C-H I 3 COO ® H C-SH H C 2 S CH COO ® 0 I Φ H3N-C-H I S 2 0 I H3N-C-H I 3 3 COO CH 2 I CH 2 H C-SH L-Cystine 2 H C-S-CH 2 L-Cysteine 0 I H3N-C-H I 3 COO 2 L-Homocysteine 3 L-Methionine Asparagine and Glutamine. The amides of the "acidic a m i n o acids," are grouped here.

The exact sequence of the two chains is reproduced in the Appendix (the reverse side of the foldout chart). The presentation chosen emphasizes certain homologous sequences between each other and in comparison with myoglobin. " They are numbered in the order in which they are eluted from the chromatographic separation. 3. PRINCIPLES OF CHAIN CONFORMATION 47 achieved by leaving certain spaces blank. In this way a large number of positions contain the same amino acid residues in the different chains.

NATURALLY OCCURRING PEPTIDES 41 The occurrence of cystine, one of whose amino groups is terminal, enables these peptides to assume a ring structure. Lysine may be replaced by arginine. The Cterminal glycine is present in the form of its amide. Vasotocin is the designation for an analogous hormone, which has isoleucine in position 3 (like ocytocin) and arginine in position 8 (like vasopressin). First produced synthetically, it was subsequently identified as a hypophyseal h o r m o n e of frogs. The physiological roles differ for these chemically similar hormones (cf.

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