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Table 6 Ar/R filters of 35 XIPs from different organism groups

From: Genome-wide analysis of major intrinsic proteins in the tree plant Populus trichocarpa: Characterization of XIP subfamily of aquaporins from evolutionary perspective

Groupa XIP Members H2 H5 LE1 LE2
  Dicot Plants     
I PtXIP1;1, PtXIP1;2, PtXIP1;3 CcXIP1;1, CcXIP1;2, CcXIP1;3, CcXIP1;4 CsXIP1;1, CsXIP1;2 VvXIP1;1, VvXIP1;2 LsXIP1;1 SlXIP1;1 V/I T A R
II PtXIP1;5 GrXIP1;1 RcXIP1;1, RcXIP2;1, RcXIP2;2 AfXIP1;1 V/I T/S V R
III PtXIP2;1, RcXIP2;3 V/I I V R
IV PtXIP1;4 A T A R
  Moss     
I PpXIP1;1 Q A A R
II PpXIP1;2 Q I T R
III SmXIP1;1 Y S A R
  Protozoa     
I DdXIP H I F R
  Fungi     
I F-FoXIP, F-GmXIP, F-AtXIP, F-TaXIP, F-TrXIP, F-TvXIP1, F-PmXIP N A/S/G A R/K
II F-TsXIP N S L R
III F-TvXIP2 A G F R
  1. aStructural subclasses for each organism group are defined based on the residues forming ar/R tetrad.