Amino acid sequence of the bacteriophage T5 gene A2 protein

The complete amino acid sequence of the bacteriophage T5-encoded gene A2 protein was determined by protein sequencing. The 134-residue sequence is closely similar to that reported for the product of gene A2–A3 of bacteriophage BF23. Segments of the sequence are similar to segments of bacteriophage T4 gene 32 protein, bacteriophage T3 RNA polymerase, and the protein encoded by the host gene responsible for isoenzyme conversion of alkaline phosphatase. The similarity of residues 26–46 to a portion of a rabbit lipopolysaccharide binding protein is possibly relevant to the function of the A2 protein.