The C-terminal tail of tubulin influences microtubule assembly and stability. In this issue of Developmental Cell, Chen et al. combine in vitro experiments using recombinant tubulin with molecular dynamics simulations to provide molecular-level insights into the importance of α-tubulin tail and its post-translational modifications in microtubule assembly and stability.
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http://dx.doi.org/10.1016/j.devcel.2021.06.018 | DOI Listing |
Nat Chem Biol
January 2025
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, USA.
Nucleoside triphosphate (NTP)-dependent protein assemblies such as microtubules and actin filaments have inspired the development of diverse chemically fueled molecular machines and active materials but their functional sophistication has yet to be matched by design. Given this challenge, we asked whether it is possible to transform a natural adenosine 5'-triphosphate (ATP)-dependent enzyme into a dissipative self-assembling system, thereby altering the structural and functional mode in which chemical energy is used. Here we report that FtsH (filamentous temperature-sensitive protease H), a hexameric ATPase involved in membrane protein degradation, can be readily engineered to form one-dimensional helical nanotubes.
View Article and Find Full Text PDFPLoS Genet
January 2025
Molecular Mycology Laboratory, Molecular Biology and Genetics Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bengaluru, India.
During chromosome segregation, the spindle assembly checkpoint (SAC) detects errors in kinetochore-microtubule attachments. Timely activation and maintenance of the SAC until defects are corrected is essential for genome stability. Here, we show that shugoshin (Sgo1), a conserved tension-sensing protein, ensures the maintenance of SAC signals in response to unattached kinetochores during mitosis in a basidiomycete budding yeast Cryptococcus neoformans.
View Article and Find Full Text PDFCentrioles play central roles in ciliogenesis and mitotic spindle assembly. Once assembled, centrioles exhibit long-term stability, a property essential for maintaining numerical control. How centriole stability is achieved and how it is lost in certain biological contexts are still not completely understood.
View Article and Find Full Text PDFSSNA-1 is a fibrillar protein localized at the area where dynamic microtubule remodeling occurs including centrosomes. Despite the important activities of SSNA1 to microtubules such as nucleation, co-polymerization, and lattice sharing microtubule branching, the underlying molecular mechanism have remained unclear due to a lack of structural information. Here, we determined the cryo-EM structure of SSNA-1 at 4.
View Article and Find Full Text PDFDynein-1 is a microtubule motor responsible for the transport of cytoplasmic cargoes. Activation of motility requires it first overcome an autoinhibited state prior to its assembly with dynactin and a cargo adaptor. Studies suggest that Lis1 may relieve dynein's autoinhibited state.
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