15N-HSQC of CjCBM5 interacting with (GlcNAc)6. The figure shows an overlay of 15N-HSQC spectra for CjCBM5 in the presence of (GlcNAc)6 at various concentrations (0.2, 1.0, 2.5, and 10 mM). The arrows indicate the direction of change in chemical shifts as a result of the titration of CjCBM5 with (GlcNAc)6. Affected residues (W283, T284, Q285, Y296, and G297) are highlighted in green on the surface model of CjCBM5. Other surface-exposed aromatic residues for which no significant chemical shift perturbation was detected (Y265 and Y282) are shown in blue for illustration purposes. HSQC, heteronuclear single quantum coherence.