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. 1994 Apr 1;125(1):31–42. doi: 10.1083/jcb.125.1.31

POM152 is an integral protein of the pore membrane domain of the yeast nuclear envelope

PMCID: PMC2120016  PMID: 8138573

Abstract

We have identified a concanavalin A-reactive glycoprotein of 150 kD that coenriches with isolated yeast nuclear pore complexes. Molecular cloning and sequencing of this protein revealed a single canonical transmembrane segment. Epitope tagging and localization by both immunofluorescence and immunoelectron microscopy confirmed that it is a pore membrane protein. The protein was termed POM152 (for pore membrane protein of 152 kD) on the basis of its location and cDNA-deduced molecular mass. POM152 is likely to be a type II membrane protein with its NH2-terminal region (175 residues) and its COOH-terminal region (1,142 residues) positioned on the pore side and cisternal side of the pore membrane, respectively. The proposed cisternally exposed domain contains eight repetitive motifs of approximately 24 residues. Surprisingly, POM152 deletion mutants were viable and their growth rate was indistinguishable from that of wild-type cells at temperatures between 17 and 37 degrees C. However, overproduction of POM152 inhibited cell growth. When expressed in mouse 3T3 cells, POM152 was found to be localized to the pore membrane, suggesting a conserved sorting pathway between yeast and mammals.

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