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The complete covalent structure of the bacteriophage lambda repressor has been determined by sequential Edman degradation, gas chromatographic-mass spectrometric peptide sequencing, and DNA sequencing of the repressor gene cI. The repressor is a single-chain, acidic protein containing 236 amino acids. The amino terminal 40 residues are highly polar and basic. Lysines and arginines in the sequence tend to be clustered.
Sauer et al. (Wed,) studied this question.