Molecular cloning and sequencing of influenza virus A/Victoria/3/75 polymerase genes: sequence evolution and prediction of possible functional domains.
The influenza virus A/Victoria/3/75 (H3N2) polymerase genes encoding PB1, PB2 and PA have been cloned by cDNA synthesis and insertion into bacterial vectors. The complete sequence for each polymerase gene has been obtained from random M13 subclones and compared to other influenza virus polymerase genes. A total of 45, 74 and 78 nucleotide changes were fixed in the period 1968-1975, corresponding to 10, 12 and 9 amino acid changes, for PB1, PB2 and PA genes, respectively. The amino acid sequence of PB1 polypeptide contains motifs found in a series of positive- and negative-RNA virus polymerase genes and that of PA polypeptide share invariant residues common to DNA and presumptive RNA helicases.
Centro de Biología Molecular (CSIC-UAM), Universidad Autónoma, Madrid, Spain.
S
S
de la Luna
C
C
Martínez
J
J
Ortín
D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D012321:DNA-Directed RNA Polymerases / Q000235:genetics*; D009980:Influenza A virus / Q000235:genetics*; D008969:Molecular Sequence Data; D012367:RNA, Viral / Q000096:biosynthesis
D012367:RNA, Viral; D012321:DNA-Directed RNA Polymerases