ICln is a ubiquitously expressed multi-functional protein that plays a critical role in regulating volume decrease in cells after cellular swelling. In plants, ICln induces Cl- currents [1,4,5], thus regulating Cl- homoeostasis in eukaryotes [2,3]. Structurally, the fold resembles a pleckstrin homology fold, on of whose roles is to recruit and tether their host protein to the cell membrane; and although the surface charges of the ICln fold are not equivalent to those of the PH domain, ICln can be phosphorylated in vitro and the PH-nature of the domain may be the part involving it in the transposition from cytosol to cell membrane during cytotonic swelling [1].

1: The ICln interactome. Furst J, Botta G, Saino S, Dopinto S, Gandini R, Dossena S, Vezzoli V, Rodighiero S, Bazzini C, Garavaglia ML, Meyer G, Jakab M, Ritter M, Wappl-Kornherr E, Paulmichl M; Acta Physiol (Oxf). 2006;187:43-49. PMID:16734741

2: Hypotonicity induces aquaporin-2 internalization and cytosol-to-membrane translocation of ICln in renal cells. Tamma G, Procino G, Strafino A, Bononi E, Meyer G, Paulmichl M, Formoso V, Svelto M, Valenti G; Endocrinology. 2007;148:1118-1130. PMID:17138647

3: Quaternary structure assessment of ICln by fluorescence resonance energy transfer (FRET) in vivo. Schmidt S, Jakab M, Costa I, Furst J, Ravasio A, Paulmichl M, Botta G, Ritter M; Cell Physiol Biochem. 2009;23:397-406. PMID:19471107

4: Cl- homeostasis in includer and excluder citrus rootstocks: transport mechanisms and identification of candidate genes. Brumos J, Talon M, Bouhlal R, Colmenero-Flores JM; Plant Cell Environ. 2010;33:2012-2027. PMID:20573047

5: Molecular and electrophysiological characterization of nucleotide-sensitive chloride current-inducing protein of Fasciola hepatica. Park JB, Son SJ, Lee GS, Cho PY, Song KS, Ryu PD, Kang SY, Hong SJ; Mol Biochem Parasitol. 2005;140:197-203. PMID:15760659