An integral membrane protein of the pore membrane domain of the nuclear envelope contains a nucleoporin-like region

doi:10.1083/jcb.122.3.513

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An integral membrane protein of the pore membrane domain of the nuclear envelope contains a nucleoporin-like region

E Hallberg, RW Wozniak and G Blobel
Laboratory of Cell Biology, Howard Hughes Medical Institute, Rockefeller University, New York 10021.

We have identified an integral membrane protein of 145 kD (estimated by SDS-PAGE) of rat liver nuclear envelopes that binds to WGA. We obtained peptide sequence from purified p145 and cloned and sequenced several cDNA clones and one genomic clone. The relative molecular mass of p145 calculated from its complete, cDNA deduced primary structure is 120.7 kD. Antibodies raised against a synthetic peptide represented in p145 reacted monospecifically with p145. In indirect immunofluorescence these antibodies gave punctate staining of the nuclear envelope. Immunogold EM showed specific decoration of the nuclear pores. Thus p145 is an integral membrane protein located specifically in the "pore membrane" domain of the nuclear envelope. To indicate this specific location, and based on its calculated relative molecular mass, the protein is termed POM 121 (pore membrane protein of 121 kD). The 1,199- residue-long primary structure shows a hydrophobic region (residues 29- 72) that is likely to form one (or two adjacent) transmembrane segment(s). The bulk of the protein (residues 73-1199) is predicted to be exposed not on the cisternal side but on the pore side of the pore membrane. It contains 36 consensus sites for various kinases. However, its most striking feature is a repetitive pentapeptide motif XFXFG that has also been shown to occur in several nucleoporins. This nucleoporin- like domain of POM 121 is proposed to function in anchoring components of the nuclear pore complex to the pore membrane.
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