Structural and functional differences between porcine brain and budding yeast microtubules
Journal Article
·
· Cell Cycle (Georgetown, Tex)
- Univ. of California, Berkeley, CA (United States). Biophysics Graduate Group and Leiden Univ.Medical Center (Netherlands), Department of Molecular Cell Biology; DOE/OSTI
- UT Southwestern Medical Center, Departments of Biophysics and Biochemistry, Dallas, TX 75390, USA
- Molecular and Cell Biology Graduate Program, UC Berkeley, CA 94720, USA
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, CA 94720, USA; Howard Hughes Medical Institute, UC Berkeley, CA 94720-3220, USA; Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, MO 63110, USA
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, CA 94720, USA; Howard Hughes Medical Institute, UC Berkeley, CA 94720-3220, USA
- Research Institute of Molecular Pathology, Dr. Bohr-Gasse 7, 1030 Vienna, Austria
- Molecular Biophysics and Integrated Bioimaging, Lawrence Berkeley National Laboratory, CA 94720, USA; Howard Hughes Medical Institute, UC Berkeley, CA 94720-3220, USA; Molecular and Cell Biology Department and QB3 Institute, UC Berkeley, CA 94720, USA
The cytoskeleton of eukaryotic cells relies on microtubules to perform many essential functions. We have previously shown that, in spite of the overall conservation in sequence and structure of tubulin subunits across species, there are differences between mammalian and budding yeast microtubules with likely functional consequences for the cell. Here we expand our structural and function comparison of yeast and porcine microtubules to show different distribution of protofilament number in microtubules assembled in vitro from these two species. The different geometry at lateral contacts between protofilaments is likely due to a more polar interface in yeast. We also find that yeast tubulin forms longer and less curved oligomers in solution, suggesting stronger tubulin:tubulin interactions along the protofilament. Finally, we observed species-specific plus-end tracking activity for EB proteins: yeast Bim1 tracked yeast but not mammalian MTs, and human EB1 tracked mammalian but not yeast MTs. These findings further demonstrate that subtle sequence differences in tubulin sequence can have significant structural and functional consequences in microtubule structure and behavior.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1625099
- Journal Information:
- Cell Cycle (Georgetown, Tex), Journal Name: Cell Cycle (Georgetown, Tex) Journal Issue: 3 Vol. 17; ISSN 1538-4101
- Publisher:
- Taylor and FrancisCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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