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. 2013 Dec 8;289(5):2577–2588. doi: 10.1074/jbc.M113.534453

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FIGURE 2. — Analysis of resonance intensities permits the identification of Vpr-binding regions in hHR23A. A, superposition of the 800-MHz ¹H-¹⁵N HSQC spectra of hHR23A alone (blue) and the hHR23A-Vpr complex (red) at 298 K. Selected hHR23A resonances are labeled with residue names and numbers. Vpr-bound hHR23A resonances are encircled. B, ratio of ¹H-¹⁵N HSQC resonance intensities (I_free/I_complex) for free hHR23A resonances in the sample of free hHR23A (I_free) and the hHR23A-Vpr complex (I_complex) sample. The data are color-coded according to domains in hHR23A: UBL (orange); LNK1, LNK2, and LNK3 (gray); UBA1 (light blue); XPCB (blue); and UBA2 (green). I_free/I_complex values for prolines and unassigned residues were arbitrarily set to 1 and colored according to domains using the same color scheme but in a lighter shade.