Structural basis for mutual relief of the Rac guanine nucleotide exchange factor DOCK2 and its partner ELMO1 from their autoinhibited forms
Open accessAbstract
DOCK2, a hematopoietic cell-specific, atypical guanine nucleotide exchange factor, controls lymphocyte migration through ras-related C3 botulinum toxin substrate (Rac) activation. Dedicator of cytokinesis 2–engulfment and cell motility protein 1 (DOCK2•ELMO1) complex formation is required for DOCK2-mediated Rac signaling. In this study, we identified the N-terminal 177-residue fragment and the C-terminal 196-residue fragment of human DOCK2 and ELMO1, respectively, as the mutual binding regions, and solved the crystal structure of their complex at 2.1-Å resolution. The C-terminal Pro-rich tail of ELMO1 winds around the Src-homology 3 domain of DOCK2, and an intermolecular five-helix bundle is formed. Overall, the entire regions of both DOCK2 and ELMO1 assemble to create a rigid structure, which is required for the DOCK2•ELMO1 binding, as revealed by mutagenesis. Intriguingly, the DOCK2•ELMO1 interface hydrophobically buries a residue which, when mutated, reportedly relieves DOCK180 from autoinhibition. We demonstrated that the ELMO-interacting region and the DOCK-homology region 2 guanine nucleotide exchange factor domain of DOCK2 associate with each other for the autoinhibition, and that the assembly with ELMO1 weakens the interaction, relieving DOCK2 from the autoinhibition. The interactions between the N- and C-terminal regions of ELMO1 reportedly cause its autoinhibition, and binding with a DOCK protein relieves the autoinhibition for ras homolog gene family, member G binding and membrane localization. In fact, the DOCK2•ELMO1 interface also buries the ELMO1 residues required for the autoinhibition within the hydrophobic core of the helix bundle. Therefore, the present complex structure reveals the structural basis by which DOCK2 and ELMO1 mutually relieve their autoinhibition for the activation of Rac1 for lymphocyte chemotaxis.
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DOCK families A and B contain N-terminal SH3 domains and a C-terminal proline-rich region that bind each other to maintain autoinhibition, which is alleviated upon binding adaptor proteins such as ELMO1.
“Generally DOCK families A and B contain N-terminal SRC Homology 3 (SH3) domains and a C-terminal proline-rich region that bind each other to maintain the protein in an autoinhibited state, an interaction that is alleviated upon binding adaptor proteins such as engulfment and cell motility protein 1 (ELMO1) (36, 37).”
From RHO to the DOCK for GDP disembarking: Structural insights into the DOCK GTPase nucleotide exchange factors (2021) · cites this paper as [37]
The Abstract and Results identify an N-terminal SH3 domain in DOCK2 and show that ELMO1 binding relieves DOCK2 autoinhibition. But the Results identify the proline-rich tail as part of ELMO1, not DOCK2; the DOCK2 regions that associate during autoinhibition are its N-terminal ELMO-interacting region and C-terminal DHR-2-containing region. The paper therefore does not support the claimed intramolecular SH3–proline-rich interaction in DOCK proteins. (LLM, conf=0.88)
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Cites
Unconventional Rac-GEF activity is mediated through the Dock180–ELMO complex
Brugnera, E., Haney, L., Grimsley, C., Lu, M., Walk, S. F., Tosello-Trampont, A.-C., Macara, I. G., Madhani, H., Fink, G. R., & Ravichandran, K. S. (2002) · Nature Cell Biology · doi:10.1038/ncb824 · Cited by 576 · see citing works
Haematopoietic cell-specific CDM family protein DOCK2 is essential for lymphocyte migration
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Self-citationZizimin1, a novel Cdc42 activator, reveals a new GEF domain for Rho proteins
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Thompson, A. P., Bitsina, C., Gray, J. L., von Delft, F., & Brennan, P. E. (2021) · Journal of Biological Chemistry · doi:10.1016/j.jbc.2021.100521 · Cited by 21 · see citing works
“Structural overview of the DHR2 domain Prior to the recent cryo-EM structure of full-length DOCK2 in complex with ELMO1 and RAC1, structural investigation of J. Biol.”
BackgroundInfluential
- Authors
- Hanawa-Suetsugu, K., Kukimoto-Niino, M., Mishima-Tsumagari, C., Akasaka, R., Ohsawa, N., Sekine, S.-I., Ito, T., Tochio, N., Koshiba, S., Kigawa, T., Terada, T., Shirouzu, M., Nishikimi, A., Uruno, T., Katakai, T., Kinashi, T., Kohda, D., Fukui, Y., & Yokoyama, S.
- Affiliations
- RIKEN Systems and Structural Biology Center, 1-7-22 Suehiro, Tsurumi, Yokohama 230-0045, Japan;
- RIKEN (JP)
- Tokyo Institute of Technology (JP)
- Japan Science and Technology Agency (JP)
- Kyushu University (JP)
- Kansai Medical University (JP)
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2012-02-13
- Volume
- 109
- Issue
- 9
- Pages
- 3305-3310
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC3295310
- OpenAlex
- W1984010921
- Cited by
- 70
- References
- 3
- Citations by year
- 2026: 2 · 2025: 3 · 2024: 3 · 2023: 8 · 2022: 3 · 2021: 6 · 2020: 3 · 2019: 6 · 2018: 5 · 2017: 2 · 2016: 5 · 2015: 7 · 2014: 6 · 2013: 7 · 2012: 4
- FWCI
- 3.09
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Proceedings of the National Academy of Sciences (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (22790469, 24111001, 22247017)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
- Keywords
- DOCK2, ELMO1, autoinhibition, Rac1 activation, lymphocyte chemotaxis, Src homology 3 domain, DOCK180, hydrophobic interface, crystal structure
- MeSH terms
- Amino Acid Sequence, Humans, Models, Molecular, Molecular Sequence Data, Protein Binding, Protein Conformation, Recombinant Fusion Proteins, Sequence Alignment, Sequence Homology, Amino Acid, Protein Structure, Secondary, Crystallography, X-Ray, src Homology Domains, Nuclear Magnetic Resonance, Biomolecular, Guanine Nucleotide Exchange Factors, GTPase-Activating Proteins, rac1 GTP-Binding Protein, Protein Interaction Mapping, Adaptor Proteins, Signal Transducing, Hydrophobic and Hydrophilic Interactions
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