Figure 6

View of the connection between the PAS core and the flanking N-terminal α helix in the PAS _Bvg model. A, The hydrogen bonds between the conserved Asn residue and the PAS core and N-terminal α helix are shown in stippled lines. Because the C-terminal α helix is absent from the model, the connections of the conserved Asp residue with the flanking C-terminal α helix could not be represented. B, Sequence alignments of these conserved regions are shown in two blocks on the right-hand side of the figure, with the pdb code numbers of the PAS proteins used for the alignment. The conserved Asn/Ser and Asp residues are denoted with asterisks.