Journal Article

Spastin interacts with the centrosomal protein NA14, and is enriched in the spindle pole, the midbody and the distal axon

Alessia Errico, Pamela Claudiani, Marilena D'Addio and Elena I. Rugarli

in Human Molecular Genetics

Volume 13, issue 18, pages 2121-2132
Published in print September 2004 | ISSN: 0964-6906
Published online July 2004 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddh223
Spastin interacts with the centrosomal protein NA14, and is enriched in the spindle pole, the midbody and the distal axon

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Hereditary spastic paraplegia (HSP) is characterized by the specific retrograde degeneration of the longest axons in the central nervous system, the corticospinal tracts. The gene most frequently involved in autosomal dominant cases of this disease, SPG4, encodes spastin, an ATPase belonging to the AAA family. AAA proteins are thought to exert their function by the energy-dependent rearrangement of protein complexes. The composite function of these proteins is directed by their binding to regulatory factors and adaptor proteins that target their activity into specific pathways in vivo. We previously found that overexpressed spastin interacts dynamically with microtubules and displays microtubule-severing activity. Here, we demonstrate that spastin is enriched in cell regions containing dynamic microtubules. During cell division spastin is found in the spindle pole, the central spindle and the midbody, whereas in immortalized motoneurons it is enriched in the distal axon and the branching points. Furthermore, spastin interacts with the centrosomal protein NA14, and co-fractionates with γ-tubulin, a centrosomal marker. Deletion of the region required for binding to NA14 disrupts spastin interaction with microtubules, suggesting that NA14 may be an important adaptor to target spastin activity at the centrosome. These data strongly argue that spastin plays a role in cytoskeletal rearrangements and dynamics, and provide an attractive explanation for the degeneration of motor axons in HSP.

Journal Article.  7920 words.  Illustrated.

Subjects: Genetics and Genomics

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