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Figure 3.
Overlap of the receptor binding domains of H1, H2, and H3 HAs
in complexes with receptor analogues. (A) The overlapped
receptor binding sites of human HAs for H1 A/S.Carolina/1918,
(blue), H2 A/Singapore/1/57, (yellow) and H3 A/Aichi/2/68, (22)
(gray) in complex with human receptor analogue, LSTc. (B) The
receptor binding domains of avian HAs for H1, A/dk/Alberta/76
(blue), H2, A/dk/Ontario/77 (yellow), and H3, A/dk/Ukraine/63
(25) (gray) in complex with human receptor analogue. The
sialopentasaccharides are colored according to the HAs to which
they are bound and some of the side-chains discussed in the text
are shown in stick representation.
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