ERK-MAPK Drives Lamellipodia Protrusion by Activating the WAVE2 Regulatory Complex
Open accessAbstract
Cell movement begins with a leading edge protrusion, which is stabilized by nascent adhesions and retracted by mature adhesions. The ERK-MAPK (extracellular signal-regulated kinase-mitogen-activated protein kinase) localizes to protrusions and adhesions, but how it regulates motility is not understood. We demonstrate that ERK controls protrusion initiation and protrusion speed. Lamellipodial protrusions are generated via the WRC (WAVE2 regulatory complex), which activates the Arp2/3 actin nucleator for actin assembly. The WRC must be phosphorylated to be activated, but the sites and kinases that regulate its intermolecular changes and membrane recruitment are unknown. We show that ERK colocalizes with the WRC at lamellipodial leading edges and directly phosphorylates two WRC components: WAVE2 and Abi1. The phosphorylations are required for functional WRC interaction with Arp2/3 and actin during cell protrusion. Thus, ERK coordinates adhesion disassembly with WRC activation and actin polymerization to promote productive leading edge advancement during cell migration.
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WAVE2 is phosphorylated by ERK or JNK at Ser308, Ser343, Thr346 and Ser351, and this phosphorylation is necessary for actin polymerization and the migration of cultured cell lines.
“WAVE2 is phosphorylated by extracellular signal-regulated kinase (ERK) or Jun N-terminal kinase (JNK) at Ser308, Ser343, Thr346 and Ser351, and this phosphorylation is necessary for actin polymerization and the migration of cultured cell lines41–43.”
From The WAVE complex in developmental and adulthood brain disorders (2025) · cites this paper as [41]
The Results (ERK Co-localizes with and Directly Phosphorylates the WRC; page unavailable) support ERK-dependent phosphorylation at the four named sites in HMECs, but the Discussion describes JNK phosphorylation only as a possibility for Ser343 and Thr346. The Results (ERK Phosphorylation of the WRC Regulates Interaction with Arp2/3 and Lamellipodial Protrusion; page unavailable) link phosphorylation to actin-polymerization cycles and protrusion, but do not establish that WAVE2 phosphorylation at these sites is necessary for migration: WAVE2 phosphosite mutants rescued Cos-7 cell motility in the presence of wild-type Abi1 and residual WAVE2. (LLM, conf=0.90)
Experimental — accuracy not yet measuredExperiments with proteins containing mutations of these sites implicate a role of ABI1 phosphorylation in the release of the WCA domain and subsequent WAVE complex activation.
“Experiments with proteins containing mutations of these sites implicate a role of ABI1 phosphorylation in the release of the WCA domain and subsequent WAVE complex activation36,41.”
From The WAVE complex in developmental and adulthood brain disorders (2025) · cites this paper as [41]
The Results and Discussion report that mutations of Abi1 phosphorylation sites reduce WRC interaction with Arp2/3 and actin, supporting a role for Abi1 phosphorylation in WRC function. They do not show that Abi1 phosphorylation releases the WCA domain. The Introduction discusses release of the related VCA domain in connection with Rac binding and Abl phosphorylation of WAVE2, not Abi1 phosphorylation; page numbers are unavailable in our copy. (LLM, conf=0.87)
Experimental — accuracy not yet measuredERK also phosphorylates multiple sites in ABI1, including Ser183, Ser216, Ser225, Thr265, Ser267, Ser392, Thr394 and Ser410.
“ERK also phosphorylates multiple sites in ABI1, including Ser183, Ser216, Ser225, Thr265, Ser267, Ser392, Thr394 and Ser41041 (Fig. 3d).”
From The WAVE complex in developmental and adulthood brain disorders (2025) · cites this paper as [41]
The Results section reports ERK-dependent phosphorylation of Abi1 and shows that mutating all eight listed sites nearly abolished phosphorylation by ERK2. But it directly identifies S183 and S225, calls S216 suspected rather than definitive, and describes T265, S267, S392, T394 and S410 as predicted ERK sites. The evidence therefore supports the group-level claim more strongly than it establishes phosphorylation at each named site. (LLM, conf=0.85)
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- Authors
- Mendoza, M. C., Er, E. E., Zhang, W., Ballif, B. A., Elliott, H. L., Danuser, G., & Blenis, J.
- Affiliations
- Harvard University (US)
- Peking University (CN)
- University of Vermont (US)
- Scripps Research Institute (US)
- Corresponding author
- Mendoza, Michelle C.
- Blenis, John
- Venue
- Molecular Cell
- Publisher
- Elsevier BV
- Published
- 2011-03
- Volume
- 41
- Issue
- 6
- Pages
- 661-671
- ISSN
- 1097-2765 (ISSN-L)
- PMC
- PMC3078620
- OpenAlex
- W2058258724
- Cited by
- 169
- References
- 2
- Citations by year
- 2026: 6 · 2025: 10 · 2024: 13 · 2023: 11 · 2022: 14 · 2021: 16 · 2020: 12 · 2019: 6 · 2018: 8 · 2017: 9 · 2016: 14 · 2015: 11 · 2014: 9 · 2013: 16 · 2012: 8
- FWCI
- 5.63
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Molecular Cell (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institutes of Health (5u54gm064346-10)
- National Cancer Institute (R37CA046595)
- National Institute of General Medical Sciences (U54-GM064346, U54 GM 64346)
- National Center for Research Resources (P20RR016462)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular Mechanics and Interactions
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Kinase Regulation and GTPase Signaling
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Axon Guidance and Neuronal Signaling
- Keywords
- ERK signaling, lamellipodia, cell migration, ABI1, Arp2/3 complex, actin polymerization, leading edge protrusion
- MeSH terms
- Actins, Cell Movement, Cells, Cultured, Cytoskeletal Proteins, Epithelial Cells, Humans, Phosphorylation, Pseudopodia, Extracellular Signal-Regulated MAP Kinases, Adaptor Proteins, Signal Transducing, Wiskott-Aldrich Syndrome Protein Family, Actin-Related Protein 2-3 Complex
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