Structural basis for Parkinson's Disease-linked LRRK2's binding to microtubules

Abstract

Leucine Rich Repeat Kinase 2 (LRRK2) is one of the most commonly mutated genes in familial Parkinsons Disease (PD). Under some circumstances, LRRK2 co-localizes with microtubules in cells, an association enhanced by PD mutations. We report a cryo-electron microscopy structure of the catalytic half of LRRK2, containing its kinase, which is in a closed conformation, and GTPase domains, bound to microtubules. We also report a structure of the catalytic half of LRRK1, which is closely related to LRRK2, but is not linked to PD. LRRK1s structure is similar to LRRK2, but LRRK1 does not interact with microtubules. Guided by these structures, we identify amino acids in LRRK2s GTPase domain that mediate microtubule binding; mutating them disrupts microtubule binding in vitro and in cells, without affecting LRRK2s kinase activity. Our results have implications for the design of therapeutic LRRK2 kinase inhibitors.