Fig. 2
From: Side chain to main chain hydrogen bonds stabilize a polyglutamine helix in a transcription factor
The conformations of the Gln side chains are well defined. a Expanded regions of the 1H,15N heteronuclear single quantum correlation (HSQC) spectra of peptides L4Q4 to L4Q20 showing the Hε21 side chain resonances. b Structure of the Gln side chain with an indication of the nuclei whose resonances are shown in a (red shade) and in c (blue shade). c Regions of the 15N planes of the H(CC)(CO)NH spectra of peptides L4Q4 to L4Q20 measured at pH 7.4 and 278 K containing the side chain aliphatic 1H resonances of the first four residues (Q1–Q4) of the polyQ tract. All nuclear magnetic resonance (NMR) spectra were measured at pH 7.4 and 278 K
