Functional features of the C-terminal region of yeast ribosomal protein L5 |
| |
Authors: | Hossein Moradi Ivailo Simoff Galyna Bartish Odd Nygård |
| |
Affiliation: | Department of Cell Biology, Arrhenius Laboratories E5, Stockholm University, 106 91, Stockholm, Sweden. |
| |
Abstract: | The aim of this study was to analyze the functional importance of the C-terminus of the essential yeast ribosomal protein L5 (YrpL5). Previous studies have indicated that the C-terminal region of YrpL5 forms an alpha-helix with a positively charged surface that is involved in protein-5S rRNA interaction. Formation of an YrpL5.5S rRNA complex is a prerequisite for nuclear import of YrpL5. Here we have tested the importance of the alpha-helix and the positively charged surface for YrpL5 function in Saccharomyces cerevisiae using site directed mutagenesis in combination with functional complementation. Alterations in the sequence forming the putative alpha-helix affected the functional capacity of YrpL5. However, the effect did not correlate with a decreased ability of the protein to bind to 5S rRNA as all rpL5 mutants tested were imported to the nucleus whether or not the alpha-helix or the positively charged surface were intact. The alterations introduced in the C-terminal sequence affected the growth rate of cells expressing mutant but functional forms of YrpL5. The reduced growth rate was correlated with a reduced ribosomal content per cell indicating that the alterations introduced in the C-terminus interfered with ribosome assembly. |
| |
Keywords: | Functional complementation Mutation analysis Ribosomal protein L5 S. cerevisiae |
本文献已被 PubMed SpringerLink 等数据库收录! |