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Biochem Biophys Res Commun. 2009 Jun 26;384(2):255-8. doi: 10.1016/j.bbrc.2009.04.098. Epub 2009 May 3.

Leucine-rich repeat kinase 2 mutants I2020T and G2019S exhibit altered kinase inhibitor sensitivity.

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1
Invitrogen Discovery Assays and Services, 501 Charmany Drive, Madison, WI 53719, USA.

Abstract

Mutations in leucine-rich repeat kinase 2 (LRRK2) are a frequent cause of late-onset autosomal dominant Parkinson's disease (PD). Some disease-associated mutations directly affect LRRK2 kinase activity and inhibition of LRRK2 is viewed as a potential therapeutic treatment for PD. We demonstrate by both binding and enzymatic assays that alterations in the kinase activity of the PD-associated mutants I2020T and G2019S are due in part to altered ATP affinity. In binding assays, G2019S and I2020T have approximately 2-fold lower and 6-fold higher ATP affinity, respectively, than wild-type LRRK2. Furthermore, using an in vitro kinase activity assay, we demonstrate that at ATP concentrations close to cellular levels (1 mM) I2020T is approximately 10-fold more resistant to ATP-competitive kinase inhibitors than wild-type whereas G2019S is 1.6-fold more sensitive. These results predict that LRRK2 status may impact kinase inhibitor potencies in vivo or in cellular models.

PMID:
19397894
DOI:
10.1016/j.bbrc.2009.04.098
[Indexed for MEDLINE]

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