title: Sequence analysis of a PM2-DNA anti-Z-IgG-binding region.
abstract: An anti-Z-antibody-binding region between PM2-DNA map units 0.05 and 0.18, containing approx. 25% of the bound PM2 antibody molecules (1,2) has been sequenced. Analysis of this PM2 DNA sequence from map units 0.00 to 0.175 demonstrates that alternating purine/pyrimidine tracts capable of adopting the left-handed conformation are present within this antibody-binding region. Longer (GC)n-rich tracts are clustered together and comprise seven alternating purine/pyrimidine-rich areas (48%-84%) ranging from 19 to 142 nucleotides in length. The DNA located between these alternating purine/pyrimidine-rich areas exhibit a low level (0%-19%) of this sequence arrangement. There is a very strong correlation between the alternating purine/pyrimidine-rich areas and the anti-Z-DNA-IgG-binding sites. Nucleotides 1461-1583 of the PM2-DNA genome encode the bacteriophage capsid protein IV. One of the PM2 left-handed sites is located within this protein-coding sequence; a B-to-Z transition within this site may be involved in protein-IV gene regulation in vivo.
mesh_terms: D001435:Bacteriophages; D001483:Base Sequence; D004247:DNA / Q000276:immunology*; D004278:DNA, Superhelical; D004279:DNA, Viral; D007074:Immunoglobulin G; D009690:Nucleic Acid Conformation
chemical_list: D004278:DNA, Superhelical; D004279:DNA, Viral; D007074:Immunoglobulin G; D004247:DNA