Cited by 24Genetic and Kidney Cyst DiseasesMicrotubule and mitosis dynamicsCystic Fibrosis Research Advances

Crystal structure of human PACRG in complex with MEIG1 reveals roles in axoneme formation and tubulin binding

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Khan, Nimra, Pelletier, Dylan, McAlear, Thomas S., Croteau, Nathalie, Veyron, Simon, Bayne, Andrew N., Black, Corbin, Ichikawa, Muneyoshi +7 more·2021·Structure

Published version of a preprint

Abstract

The Parkin co-regulated gene protein (PACRG) binds at the inner junction between doublet microtubules of the axoneme, a structure found in flagella and cilia. PACRG binds to the adaptor protein meiosis expressed gene 1 (MEIG1), but how they bind to microtubules is unknown. Here, we report the crystal structure of human PACRG in complex with MEIG1. PACRG adopts a helical repeat fold with a loop that interacts with MEIG1. Using the structure of the axonemal doublet microtubule from the protozoan Chlamydomonas reinhardtii and single-molecule fluorescence microscopy, we propose that PACRG binds to microtubules while simultaneously recruiting free tubulin to catalyze formation of the inner junction. We show that the homologous PACRG-like protein also mediates dual tubulin interactions but does not bind MEIG1. Our findings establish a framework to assess the function of the PACRG family of proteins and MEIG1 in regulating axoneme assembly.

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Crossref · 10.1016/j.str.2021.01.001

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  • The multiple contacts of CFAP20 with ciliary axoneme tubulins and PACRG, as well as proximity to CFAP52 and other proteins at or near the inner junction, could explain the degree of conservation of CFAP20.

    “The multiple contacts of CFAP20 with ciliary axoneme tubulins and PACRG, as well as proximity to CFAP52 and other proteins at or near the inner junction19–21,71 (Figs. 1b and 8), could explain this degree of conservation.”

    From The inner junction protein CFAP20 functions in motile and non-motile cilia and is critical for vision (2022) · cites this paper as [71]

    The Results section (page unavailable) places FAP20 (CFAP20) beside PACRG at the inner junction and reports a PACRG loop that interacts with FAP20. It does not establish CFAP20’s multiple tubulin contacts, proximity to CFAP52, or the proposed explanation for CFAP20’s conservation. (LLM, conf=0.85)

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Authors
Khan, N., Pelletier, D., McAlear, T. S., Croteau, N., Veyron, S., Bayne, A. N., Black, C., Ichikawa, M., Khalifa, A. A. Z., Chaaban, S., Kurinov, I., Brouhard, G., Bechstedt, S., Bui, K. H., & Trempe, J.-F.
Affiliations
  • McGill University (CA)
  • Cornell University (US)
Corresponding author
Trempe, Jean-François
Venue
Structure
Publisher
Elsevier BV
Published
2021-06
Volume
29
Issue
6
Pages
572-586.e6
ISSN
0969-2126 (ISSN-L)
OpenAlex
W3126256293
Cited by
24
References
74
Citations by year
2026: 1 · 2025: 3 · 2024: 4 · 2023: 6 · 2022: 5 · 2021: 2 · 2020: 2 · 2019: 1
FWCI
2.40
Type
journal article
Language
en
Open access
Locations
  • Structure (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Natural Sciences and Engineering Research Council of Canada
  • National Institute of General Medical Sciences
  • Canadian Institutes of Health Research
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Kidney Cyst Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Cystic Fibrosis Research Advances
Keywords
PACRG, axoneme assembly, tubulin binding, flagella, cilia, Chlamydomonas reinhardtii, protein-protein complex
MeSH terms
Protein Domains, Single Molecule Imaging, Binding Sites, Humans, Microfilament Proteins, Microscopy, Fluorescence, Mutation, Nuclear Proteins, Phosphoproteins, Protein Binding, Protein Conformation, Tubulin, Chlamydomonas reinhardtii, Crystallography, X-Ray, Cell Cycle Proteins, Molecular Chaperones, Multiprotein Complexes, Axoneme

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