The sequence of the fusion (F) glycoprotein of turkey rhinotracheitis virus (TRTV) has been deduced from cDNA clones derived from oligo(dT)-selected infected cell RNA. The protein consists of 538 amino acids, the F2 and F1 subunits containing 102 (including the F2-F1 connecting peptide RRRR) and 436 residues, respectively. Each subunit has one potential -linked glycosylation site. The protein has 38 to 39% amino acid identity with the F protein of respiratory syncytial virus ( genus) but only about half that with members of the other two genera ( and ) in the family. This is the first sequence evidence to support the view that TRTV is a pneumovirus, the first avian member of the genus to be described.


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