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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Uso1 protein contains a coiled-coil rod region essential for protein transport from the ER to the Golgi apparatus in Saccharomyces cerevisiae.

We have previously shown that the Saccharomyces cerevisiae USO1 gene required in the protein transport from the endoplasmic reticulum (ER) to the Golgi apparatus encodes a 200-kDa protein (1,790 amino acids) which is present in a nonglobular high molecular mass complex. Antibodies against an N-terminal portion of Uso1 protein recognized a 100-kDa protein in Western blot of the temperature-sensitive uso1-1 mutant cell lysate. The nucleotide sequence of uso1-1 indicated the 951st codon was UAG (amber) in place of CAG (glutamine) in USO1. Deletion study of USO1 gene indicated that such truncated Uso1 polypeptides are sufficiently functional at 25 degrees C but not at 37 degrees C. Mutant Uso1-1 protein displayed an apparent molecular mass of 400-500 kDa in gel filtration while it cosedimented with a globular 6S marker protein, horseradish peroxidase (44 kDa), in sucrose density gradient centrifugation. These results indicated that truncated Uso1-1 protein is still present in a nonglobular high molecular mass complex, similar to the wild-type Uso1 protein.[1]


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