FIG. 6.

Sequence alignment of the globular head region of the J-V G protein with the HN proteins of FDLV and selected members of the Respirovirus and Rubulavirus genera. The seven proposed neuraminidase active-site residues are shaded and numbered. The putative sialic acid binding site hexapeptide is boxed. Proline, glycine, and cysteine residues conserved among all the attachment proteins in the alignment are boldfaced. Amino acid residue numbers for each protein are shown to the left of each sequence. Dots indicate identical residues, and dashes represent gaps introduced during sequence alignment. See Materials and Methods for database accession numbers.