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Cloning and characterization of a cDNA encoding Ran binding protein from wheat
Bin Tian1, Zhan-Bing Lin, Yu Ding
1Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing, China.
DNA Sequence : the Journal of DNA Sequencing and Mapping
|November 2, 2006
Summary
Researchers identified a wheat Ran binding protein (TaRanBP1) involved in nucleocytoplasmic transport. This protein is conserved across species, with variations in its N- and C-termini potentially dictating specific cellular roles.
Area of Science:
- Molecular Biology
- Cell Biology
- Genetics
Background:
- Ran binding protein (RanBP) regulates nucleocytoplasmic transport and mitosis by interacting with Ran.
- Understanding RanBP function across different species is crucial for comprehending fundamental cellular processes.
Purpose of the Study:
- To isolate and characterize a novel wheat Ran binding protein (TaRanBP1).
- To investigate the evolutionary conservation and structural features of TaRanBP1 in comparison to RanBPs from other organisms.
Main Methods:
- Isolation of wheat TaRanBP1 cDNA using RT-PCR.
- Sequence analysis and comparison with known RanBPs.
- Phylogenetic reconstruction of TaRanBP1 with other species' RanBPs.
- Structural analysis of conserved and variable regions.
Main Results:
- TaRanBP1 shares significant sequence identity with Arabidopsis AtRanBP1 and considerable similarity with human and fungal RanBPs.
- The TaRanBP1 gene is ubiquitously expressed in wheat tissues (roots, leaves, stems).
- Phylogenetic analysis shows distinct clustering of plant, animal, and fungal RanBPs.
- RanBPs exhibit high conservation in their middle region (Ran binding domain, conserved motifs) but low similarity in N- and C-termini.
Conclusions:
- TaRanBP1 is a conserved protein involved in fundamental cellular processes.
- The conserved middle region is essential for Ran binding and GTP hydrolysis.
- Variable N- and C-termini likely confer species-specific functions to RanBPs in different physiological processes.
