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We have characterized a protein with an estimated molecular mass of 130 kDa that is contained in a highly enriched yeast nuclear pore complex (NPC) fraction. Partial amino acid sequence from this protein has led us to a previously identified open reading frame on chromosome XI of Saccharomyces cerevisiae encoding a protein of 133 kDa. Due to its coenrichment with NPCs during cell fractionation and the phenotype observed in the disrupted strain, we propose to term the gene encoding this protein NUP133. Cells carrying a disrupted copy of NUP133 were temperature sensitive for growth. In addition, abnormal clustering of NPCs was observed. This phenotype is similar to that previously observed in the disruption of another nucleoporin gene, NUP145. We speculate that the gene product of NUP133, Nup133p, may functionally overlap with the NUP145 gene product, Nup145p, and that these proteins may be involved in maintaining the position of the NPC within the nuclear envelope.

Disruption of the nucleoporin gene NUP133 results in clustering of nuclear pore complexes.