Primary structure of the λ repressor

Abstract
The complete covalent structure of the bacteriophage .lambda. repressor was 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.