Open AccessCharacterization of kinesin switch I mutations that cause hereditary spastic paraplegia
Author(s) -
Scott Jennings,
Madeline Chenevert,
Liqiong Liu,
Madhusoodanan Mottamal,
Edward Wojcik,
Thomas M. Huckaba
Publication year - 2017
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0180353
Subject(s) - hereditary spastic paraplegia , kinesin , mutation , phenotype , mutant , biology , genetics , gene isoform , motility , gene , microbiology and biotechnology , microtubule
Kif5A is a neuronally-enriched isoform of the Kinesin-1 family of cellular transport motors. 23 separate mutations in the motor domain of Kif5A have been identified in patients with the complicated form of hereditary spastic paraplegia (HSP). We performed in vitro assays on dimeric recombinant Kif5A with HSP-causing mutations in the Switch I domain, which participates in the coordination and hydrolysis of ATP by kinesin. We observed a variety of significantly reduced catalytic and mechanical activities as a result of each mutation, with the shared phenotype from each that motility was significantly reduced. Substitution of Mn 2+ for Mg 2+ in our reaction buffers provides a dose-dependent rescue in both the catalytic and ensemble mechanical properties of the S203C mutant. This work provides mechanistic insight into the cause of HSP in patients with these mutations and points to future experiments to further dissect the root cause of this disease.