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The lipidation profile of aquaporin-0 correlates with the acyl composition of phosphoethanolamine lipids in lens membranes.

Ismail, Vian S. and Mosely, Jackie A. and Tapodi, Antal and Quinlan, Roy A. and Sanderson, John M. (2016) 'The lipidation profile of aquaporin-0 correlates with the acyl composition of phosphoethanolamine lipids in lens membranes.', Biochimica et Biophysica Acta (BBA) - Biomembranes., 1858 (11). pp. 2763-2768.

Abstract

The lens fiber major intrinsic protein (otherwise known as aquaporin-0 (AQP0), MIP26 and MP26) has been examined by mass spectrometry (MS) in order to determine the speciation of acyl modifications to the side chains of lysine residues and the N-terminal amino group. The speciation of acyl modifications to the side chain of one specific, highly conserved lysine residue (K238) and the N-terminal amino group of human and bovine AQP0 revealed, in decreasing order of abundance, oleoyl, palmitoyl, stearoyl, eicosenoyl, dihomo-γ-linolenoyl, palmitoleoyl and eicosadienoyl modifications. In the case of human AQP0, an arachidonoyl modification was also found at the N-terminus. The relative abundances of these modifications mirror the fatty acid composition of lens phosphatidylethanolamine lipids. This lipid class would be expected to be concentrated in the inner leaflet of the lens fiber membrane to which each of the potential AQP0 lipidation sites is proximal. Our data evidence a broad lipidation profile that is both species and site independent, suggesting a chemical-based ester aminolysis mechanism to explain such modifications.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1016/j.bbamem.2016.06.026
Publisher statement:© 2016 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date accepted:30 June 2016
Date deposited:15 July 2016
Date of first online publication:01 July 2016
Date first made open access:01 July 2017

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