Ankyrin-B directs membrane tethering of Periaxin and is required for maintenance of lens fiber cell hexagonal shape and mechanics

Rupalatha Maddala, Mark Walters, Peter J Brophy, Vann Bennett, Ponugoti V Rao

Research output: Contribution to journalArticlepeer-review

Abstract

Periaxin, a PDZ domain protein expressed preferentially in myelinating Schwann cells and lens fibers, plays a key role in membrane scaffolding and cytoarchitecture. Little is known, however, about how periaxin (Prx) is anchored to the plasma membrane. Here we report that Ankyrin-B (AnkB), a well characterized adaptor protein involved in linking the spectrin-actin cytoskeleton to integral membrane proteins, is required for membrane association of Prx in lens fibers and colocalizes with Prx in hexagonal fiber cells. Under AnkB haploinsufficiency, Prx accumulates in the soluble fraction with a concomitant loss from the membrane-enriched fraction of mouse lenses. Moreover, AnkB haploinsufficiency-induced age-dependent disruptions in fiber cell hexagonal geometry and radial alignment, and decreased compressive stiffness in mouse lenses parallel the changes observed in Prx null mouse lens. Both AnkB and Prx deficient mice exhibit disruptions in membrane organization of the spectrin-actin network and the dystrophin-glycoprotein complex in lens fiber cells. Taken together, these observations reveal that AnkB is required for Prx membrane anchoring and for maintenance of lens fiber cell hexagonal geometry, membrane skeleton organization and biomechanics.

Original languageEnglish
Pages (from-to)ajpcell.00111.2015
JournalAmerican Journal of Physiology - Cell Physiology
DOIs
Publication statusPublished - 15 Jan 2016

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