ArticleThe Journal of biological chemistry2011
The IQGAP1 protein is a calmodulin-regulated barbed end capper of actin filaments: possible implications in its function in cell migration.
Article in The Journal of biological chemistry, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers.
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Who cites it
34 citing papers in PubMed, 48 citations in OpenAlex.
- IqgD is a Rac1-interacting IQGAP required for efficient growth of Dictyostelium discoideum on bacterial lawns.Cell communication and signaling : CCS · 2026Article
- Queue Gaps Among the IQGAPs inInternational journal of molecular sciences · 2026Review
- Calcium transients regulate the apical emergence of basally located progenitors during Xenopus skin development.Nature communications · 2025Article
- Actin filament dynamics at barbed ends: New structures, new insights.Current opinion in cell biology · 2024Review
- Coordination of actin plus-end dynamics by IQGAP1, formin, and capping protein.The Journal of cell biology · 2024Article
- Coordination of actin plus-end dynamics by IQGAP1, formin, and capping protein.bioRxiv : the preprint server for biology · 2024Article
- Mechanisms of actin disassembly and turnover.The Journal of cell biology · 2023Review
- Article
- CDC42-IQGAP Interactions Scrutinized: New Insights into the Binding Properties of the GAP-Related Domain.International journal of molecular sciences · 2022Article
- Single-molecule imaging of IQGAP1 regulating actin filament dynamics.Molecular biology of the cell · 2022Article
- Selectivity Determinants of RHO GTPase Binding to IQGAPs.International journal of molecular sciences · 2021Article
- Article
- Pleiotropic Roles of Calmodulin in the Regulation of KRas and Rac1 GTPases: Functional Diversity in Health and Disease.International journal of molecular sciences · 2020Review
- The Role of Calmodulin in Tumor Cell Migration, Invasiveness, and Metastasis.International journal of molecular sciences · 2020Review
- Endothelial IQGAP1 regulates leukocyte transmigration by directing the LBRC to the site of diapedesis.The Journal of experimental medicine · 2019Article
- Site-specific expression of IQGAP1 in human nephrons.Journal of molecular histology · 2019Article
- Ras GTPase-Activating-Like Protein IQGAP1 (IQGAP1) Promotes Breast Cancer Proliferation and Invasion and Correlates with Poor Clinical Outcomes.Medical science monitor : international medical journal of experimental and clinical research · 2018Article
- Article
- The coordinating role of IQGAP1 in the regulation of local, endosome-specific actin networks.Biology open · 2017Article
- The IQGAP1 N-Terminus Forms Dimers, and the Dimer Interface Is Required for Binding F-Actin and Calcium-Bound Calmodulin.Biochemistry · 2016Article
Corrections and comments
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Authors and funding
4 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
IQGAP1 is a large modular protein that displays multiple partnership and is thought to act as a scaffold in coupling cell signaling to the actin and microtubule cytoskeletons in cell migration, adhesion, and cytokinesis. However the molecular mechanisms underlying the activities of IQGAP1 are poorly understood in part because of its large size, poor solubility and lack of functional assays to challenge biochemical properties in various contexts. We have purified bacterially expressed recombinant human IQGAP1. The protein binds Cdc42, Rac1, and the CRIB domain of N-WASP in a calmodulin-sensitive fashion. We further show that in addition to bundling of filaments via a single N-terminal calponin-homology domain, IQGAP1 actually regulates actin assembly. It caps barbed ends, with a higher affinity for ADP-bound terminal subunits (K(B) = 4 nM). The barbed end capping activity is inhibited by calmodulin, consistent with calmodulin binding to IQGAP1 with a K(C) of 40 nm, both in the absence and presence of Ca(2+) ions. The barbed end capping activity resides in the C-terminal half of IQGAP1. It is possible that the capping activity of IQGAP1 accounts for its stimulation of cell migration. We further find that bacterially expressed recombinant IQGAP1 fragments easily co-purify with nucleic acids that turn out to activate N-WASP protein to branch filaments with Arp2/3 complex. The present results open perspectives for tackling the function of IQGAP1 in more complex reconstituted systems.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.