CAMSAP/Patronins regulate microtubule minus-end dynamics. Their end specificity is mediated by their CKK domains, which we proposed recognise specific tubulin conformations found at minus ends. To critically test this idea, we compared the human CAMS ...
CAMSAP/Patronins regulate microtubule minus-end dynamics. Their end specificity is mediated by their CKK domains, which we proposed recognise specific tubulin conformations found at minus ends. To critically test this idea, we compared the human CAMSAP1 CKK domain (HsCKK) with a CKK domain from Naegleria gruberi (NgCKK), which lacks minus-end specificity. Here we report near-atomic cryo-electron microscopy structures of HsCKK- and NgCKK-microtubule complexes, which show that these CKK domains share the same protein fold, bind at the intradimer interprotofilament tubulin junction, but exhibit different footprints on microtubules. NMR experiments show that both HsCKK and NgCKK are remarkably rigid. However, whereas NgCKK binding does not alter the microtubule architecture, HsCKK remodels its microtubule interaction site and changes the underlying polymer structure because the tubulin lattice conformation is not optimal for its binding. Thus, in contrast to many MAPs, the HsCKK domain can differentiate subtly specific tubulin conformations to enable microtubule minus-end recognition.
Organizational Affiliation:
Institute of Structural and Molecular Biology, Birkbeck, University of London, Malet Street, London, UK.,Cell Biology and Biophysics Unit, National Institute of Neurological Disorders and Stroke, Bethesda, MD, 20892, USA.,University of Basel, Biozentrum, CH-4056, Basel, Switzerland.,NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands. M.Baldus@uu.nl.,Institute of Structural and Molecular Biology, Birkbeck, University of London, Malet Street, London, UK. c.moores@mail.cryst.bbk.ac.uk.,Medical Research Institute, School of Medicine, Wuhan University, 430071, Wuhan, China.,Institute of Structural and Molecular Biology, Birkbeck, University of London, Malet Street, London, UK. j.atherton@mail.cryst.bbk.ac.uk.,MOE Key Lab for biomolecular Condensates & Cellular Dynamics, School of Life Sciences, University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026, Anhui, China.,Laboratory of Biomolecular Research, Division of Biology and Chemistry, Paul Scherrer Institut, Villigen, PSI, Switzerland.,NMR Spectroscopy, Bijvoet Center for Biomolecular Research, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands.,Biophysics Center, National Heart, Lung and Blood Institute, Bethesda, MD, 20892, USA.,Cell Biology, Department of Biology, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH, Utrecht, The Netherlands.
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