Multiple sequence alignment of NACHT domains of NLRPs, NOD1, NOD2 and Nlrc4; the residues interacting with ATP are displayed in bold fonts.

<p>The critical ATP-binding residues (proved experimentally), presented in red-bold font; the residues found within 5-6Å of ATP (adopted from atomic/residual distance calculation; <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0209420#pone.0209420.g004" target="_blank">Fig 4</a>) are visualized in black fonts. The sequence motifs crucial for ATP binding are boxed in different colors (Walker A: blue; Walker B: salmon; Sensor 1: orange; GFxxxxRxxYF motif: light gray; PhhCW motif: green; WH-His: purple). The key ATP-coordinating residues are highlighted in yellow boxes and are marked in inverted triangle.</p>