Fig. 2From: Characterization of SIPs-type aquaporins and their roles in response to environmental cues in rice (Oryza sativa L.)Structural modelling of OsSIP1 and OsSIP2 proteins. (A, B) Membrane topology of OsSIP1 and OsSIP2 The transmembrane helices are numbered in Roman numerals, and the loop regions are indicated (LA-LE). Residues in the NPA motif and the ar/R constriction (R1, R2, R3, R4) are highlighted in green and red respectfully. Residues shaded in olive green represent the putative phosphorylation residues. (C, D) The ar/R region in the 3D structures of OsSIP1 and OsSIP2 predicted by homology modelling using the SWISS-MODEL server and depicted using PyMol. The four residues of the region are shown as sticks for their side chains. The colored spheres represent the pore at the constriction. (E) A superimposition of the predicted structures of OsSIP1 and OsSIP2 showing only the ar/R constrictions. See Methods for detailsBack to article page