ISSN:
1573-5028
Keywords:
GTP-binding proteins
;
Vicia faba
;
Ran-related protein
;
cell cycle regulation
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A clone obtained from a broad bean (Vicia faba) developing cotyledon cDNA library contained the complete coding sequence of a polypeptide with very high homology to the small GTP-binding proteins Ran from human cells and Spi1 from yeast. These proteins belong to the ras superfamily of proteins involved in different basic cellular processes. The Ran/Spi1 proteins interact with a protein bound to DNA (RCC1) and are thought to function in the regulation of the cell cycle. The amino acid sequence of the obtained plant Ran-homologue, designated Vfa-ran, is 74% and 76% identical to Ran and Spi1, respectively. The five functional, conserved domains of ras-related proteins are present in the Vfa-ran sequence. However, as in Ran/Spi1 the C-terminus of Vfa-ran is very acidic and lacks the Cys motif for isoprenylation. Northern blotting revealed a corresponding mRNA expression in broad bean roots, leaves, and cotyledons with the highest level in roots.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00014451
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