Genetic studies of the lac repressor. XIV. Analysis of 4000 altered Escherichia coli lac repressors reveals essential and non-essential residues, as well as "spacers" which do not require a specific sequence.

1994 
Amber mutations have been constructed at 328 positions, corresponding to residues 2 to 329 in the E. coli lac repressor protein. Synthetic and naturally occurring nonsense suppressors have been used to insert, in series, 12-13 amino acids at positions specified by an amber (UAG) codon in the lacI mRNA. The resulting set of over 4000 single amino acid replacements in the lac repressor protein allows a detailed analysis of its substitution tolerance along the linear array of residues, and reveals structure-function relationships in lac repressor and in proteins in general. There are two main regions in the repressor which are extremely sensitive to amino acid replacements
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