Structural Insights into the Intrinsic Self-Assembly of Par-3 N-Terminal Domain

Y. Zhang, W. Wang, J. Chen, K. Zhang, F. Gao, B. Gao, S. Zhang, Mingdong Dong, F. Besenbacher, W. Gong, M. Zhang, F. Sun, W. Feng

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Par-3, the central organizer of the Par-3/Par-6/atypical protein kinase C complex, is a multimodular scaffold protein that is essential for cell polarity establishment and maintenance. The N-terminal domain (NTD) of Par-3 is capable of self-association to form filament-like structures, although the underlying mechanism is poorly understood. Here, we determined the crystal structure of Par-3 NTD and solved the filament structure by cryoelectron microscopy. We found that an intrinsic "front-to-back" interaction mode is important for Par-3 NTD self-association and that both the lateral and longitudinal packing within the filament are mediated by electrostatic interactions. Disruptions of the lateral or longitudinal packing significantly impaired Par-3 NTD self-association and thereby impacted the Par-3-mediated epithelial polarization. We finally demonstrated that a Par-3 NTD-like domain from histidine ammonia-lyase also harbors a similar self-association capacity. This work unequivocally provides the structural basis for Par-3 NTD self-association and characterizes one type of protein domain that can self-assemble via electrostatic interactions.
Original languageEnglish
JournalStructure
Volume21
Issue6
Pages (from-to)997-1006
Number of pages14
ISSN0969-2126
DOIs
Publication statusPublished - 1 Jan 2013

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