6sup
From Proteopedia
Crystal Structure of TcdB2-TccC3-Cdc42
Structural highlights
FunctionQ8GF97_PHOLU Q8GF99_PHOLU CDC42_HUMAN Plasma membrane-associated small GTPase which cycles between an active GTP-bound and an inactive GDP-bound state. In active state binds to a variety of effector proteins to regulate cellular responses. Involved in epithelial cell polarization processes. Regulates the bipolar attachment of spindle microtubules to kinetochores before chromosome congression in metaphase. Plays a role in the extension and maintenance of the formation of thin, actin-rich surface projections called filopodia. Mediates CDC42-dependent cell migration.[1] [2] [3] Publication Abstract from PubMedTc toxins are bacterial protein complexes that inject cytotoxic enzymes into target cells using a syringe-like mechanism. Tc toxins are composed of a membrane translocator and a cocoon that encapsulates a toxic enzyme. The toxic enzyme varies between Tc toxins from different species and is not conserved. Here, we investigate whether the toxic enzyme can be replaced by other small proteins of different origin and properties, namely Cdc42, herpes simplex virus ICP47, Arabidopsis thaliana iLOV, Escherichia coli DHFR, Ras-binding domain of CRAF kinase, and TEV protease. Using a combination of electron microscopy, X-ray crystallography and in vitro translocation assays, we demonstrate that it is possible to turn Tc toxins into customizable molecular syringes for delivering proteins of interest across membranes. We also infer the guidelines that protein cargos must obey in terms of size, charge, and fold in order to apply Tc toxins as a universal protein translocation system. Towards the application of Tc toxins as a universal protein translocation system.,Roderer D, Schubert E, Sitsel O, Raunser S Nat Commun. 2019 Nov 20;10(1):5263. doi: 10.1038/s41467-019-13253-8. PMID:31748551[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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