title: Sequence analysis of conserved regA and variable orf43.1 genes in T4-like bacteriophages.
abstract: Bacteriophage T4 RegA protein is a translational repressor of several phage mRNAs. In the T4-related phages examined, regA nucleotide sequences are highly conserved and the inferred amino acid sequences are identical. The exceptional phage, RB69, did not produce a RegA protein reproducibly identifiable by Western blots (immunoblots) nor did it produce mRNA that hybridized to T4 regA primers. Nucleotide sequences of either 223 or 250 base pairs were identified immediately 3' to regA in RB18 and RB51 that were absent in T-even phages. Open reading frames in these regions, designated orf43.1RB18 and orf43.1RB51, potentially encode related proteins of 8.5 and 9.2 kilodaltons, respectively. orf43.1 sequences, detected in 13 of 27 RB bacteriophage chromosomes analyzed by polymerase chain reaction, are either RB18- or RB51-like and have flanking repeat sequences that may promote orf43.1 deletion.
authors.affiliation: Department of Microbiology, North Carolina State University, Raleigh 27695-7615.
authors.forename: E S
authors.initials: ES
authors.lastname: Miller
authors.forename: C E
authors.initials: CE
authors.lastname: Jozwik
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003090:Coliphages / Q000235:genetics*; D004251:DNA Transposable Elements; D004926:Escherichia coli / Q000235:genetics*; D005814:Genes, Viral; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D013604:T-Phages / Q000235:genetics*; D014764:Viral Proteins / Q000235:genetics*
chemical_list: D004251:DNA Transposable Elements; D015345:Oligonucleotide Probes; C066700:RegA protein, Enterobacteria phage T4; D014764:Viral Proteins