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Fungal Ice2p is in the same superfamily as SERINCs, restriction factors for HIV and other viruses

Alli-Balogun, GO; Levine, TP; (2021) Fungal Ice2p is in the same superfamily as SERINCs, restriction factors for HIV and other viruses. Proteins 10.1002/prot.26145. (In press). Green open access

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Abstract

Ice2p is an integral endoplasmic reticulum (ER) membrane protein in budding yeast S. cerevisiae named ICE because it is required for Inheritance of Cortical ER. Ice2p has also been reported to be involved in an ER metabolic branch-point that regulates the flux of lipid either to be stored in lipid droplets or to be used as membrane components. Alternately, Ice2p has been proposed to act as a tether that physically bridges the ER at contact sites with both lipid droplets and the plasma membrane via a long loop on the protein's cytoplasmic face that contains multiple predicted amphipathic helices. Here we carried out a bioinformatic analysis to increase understanding of Ice2p. Firstly, regarding topology, we found that diverse members of the fungal Ice2 family have ten transmembrane helices, which places the long loop on the exofacial face of Ice2p, where it cannot form inter-organelle bridges. Secondly, we identified Ice2 as a full-length homologue of SERINC (serine incorporator), a family of proteins with ten transmembrane helices found universally in eukaryotes. Since SERINCs are potent restriction factors for HIV and other viruses, study of Ice2p may reveal functions or mechanisms that shed light on viral restriction by SERINCs. This article is protected by copyright. All rights reserved.

Type: Article
Title: Fungal Ice2p is in the same superfamily as SERINCs, restriction factors for HIV and other viruses
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/prot.26145
Publisher version: https://doi.org/10.1002/prot.26145
Language: English
Additional information: © 2021 The Authors. Proteins: Structure, Function, and Bioinformatics published by Wiley Periodicals LLC. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/).
Keywords: HIV, Ice2p, SERINC, endoplasmic reticulum, membrane contact site, tether, virus restriction factor
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
URI: https://discovery.ucl.ac.uk/id/eprint/10128089
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