Nucleation is one of the least understood steps of microtubule dynamics. It is a kinetically unfavorable process that is templated in the cell by the γ-tubulin ring complex or by preexisting microtubules; it also occurs in vitro from pure tubulin. He ...
Nucleation is one of the least understood steps of microtubule dynamics. It is a kinetically unfavorable process that is templated in the cell by the γ-tubulin ring complex or by preexisting microtubules; it also occurs in vitro from pure tubulin. Here we study the nucleation inhibition potency of natural or artificial proteins in connection with their binding mode to the longitudinal surface of α- or β-tubulin. The structure of tubulin-bound CopN, a Chlamydia protein that delays nucleation, suggests that this protein may interfere with two protofilaments at the (+) end of a nucleus. Designed ankyrin repeat proteins that share a binding mode similar to that of CopN also impede nucleation, whereas those that target only one protofilament do not. In addition, an αRep protein predicted to target two protofilaments at the (-) end does not delay nucleation, pointing to different behaviors at both ends of the nucleus. Our results link the interference with protofilaments at the (+) end and the inhibition of nucleation.
Organizational Affiliation:
Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette Cedex, France.,INSERM UMR-S 1193, Université Paris-Sud, Université Paris-Saclay, 92296 Châtenay-Malabry, France.,Biochimie-Hormonologie, APHP, Hôpitaux Universitaires Paris-Sud, 92141 Clamart, France.,Institute for Integrative Biology of the Cell (I2BC), CEA, CNRS, Université Paris-Sud, Université Paris-Saclay, 91198 Gif-sur-Yvette Cedex, France; christian.pous@u-psud.fr benoit.gigant@i2bc.paris-saclay.fr.,INSERM UMR-S 1193, Université Paris-Sud, Université Paris-Saclay, 92296 Châtenay-Malabry, France; christian.pous@u-psud.fr benoit.gigant@i2bc.paris-saclay.fr.,Biochimie, APHP, Hôpitaux Universitaires de l'Est Parisien, 75571 Paris Cedex 12, France.,Department of Biochemistry, University of Zurich, CH-8057 Zurich, Switzerland.
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