Structure
Volume 15, Issue 11, 13 November 2007, Pages 1467-1481
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Article
The Structure of the Coiled-Coil Domain of Ndel1 and the Basis of Its Interaction with Lis1, the Causal Protein of Miller-Dieker Lissencephaly

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Summary

Ndel1 and Nde1 are homologous and evolutionarily conserved proteins, with critical roles in cell division, neuronal migration, and other physiological phenomena. These functions are dependent on their interactions with the retrograde microtubule motor dynein and with its regulator Lis1—a product of the causal gene for isolated lissencephaly sequence (ILS) and Miller-Dieker lissencephaly. The molecular basis of the interactions of Ndel1 and Nde1 with Lis1 is not known. Here, we present a crystallographic study of two fragments of the coiled-coil domain of Ndel1, one of which reveals contiguous high-quality electron density for residues 10–166, the longest such structure reported by X-ray diffraction at high resolution. Together with complementary solution studies, our structures reveal how the Ndel1 coiled coil forms a stable parallel homodimer and suggest mechanisms by which the Lis1-interacting domain can be regulated to maintain a conformation in which two supercoiled α helices cooperatively bind to a Lis1 homodimer.

PROTEINS

Cited by (0)

6

These authors contributed equally to this work.

7

Present address: MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, United Kingdom.

8

Present address: Systems Microbiology Research Center, KRIBB, Daejeon 305-806, Korea.