6aj4 | pdb_00006aj4

Crystal structure of the DHR-2 domain of DOCK7 in complex with Cdc42

spinqualitylabelsall models 6aj4, resolution 3.26Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6aj4 is a 8 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.256Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Disease DOCK7_HUMAN Early-onset epileptic encephalopathy-cortical blindness-intellectual disability-facial dysmorphism syndrome. The disease is caused by mutations affecting the gene represented in this entry. Function DOCK7_HUMAN Functions as a guanine nucleotide exchange factor (GEF), which activates Rac1 and Rac3 Rho small GTPases by exchanging bound GDP for free GTP. Does not have a GEF activity for CDC42. Required for STMN1 'Ser-15' phosphorylation during axon formation and consequently for neuronal polarization (PubMed:16982419). Has a role in pigmentation (By similarity). Involved in the regulation of cortical neurogenesis through the control of radial glial cells (RGCs) proliferation versus differentiation; negatively regulates the basal-to-apical interkinetic nuclear migration of RGCs by antagonizing the microtubule growth-promoting function of TACC3 (By similarity).[UniProtKB:Q8R1A4] Publication Abstract from PubMed The Dedicator Of CytoKinesis (DOCK) family of atypical guanine nucleotide exchange factors activates the Rho family GTPases Rac and/or Cdc42 through DOCK homology region 2 (DHR-2). Previous structural analyses of the DHR-2 domains of DOCK2 and DOCK9 have shown that they preferentially bind Rac1 and Cdc42, respectively; however, the molecular mechanism by which DHR-2 distinguishes between these GTPases is unclear. Here we report the crystal structure of the Cdc42-bound form of the DOCK7 DHR-2 domain showing dual specificity for Rac1 and Cdc42. The structure revealed increased substrate tolerance of DOCK7 at the interfaces with switch 1 and residue 56 of Cdc42. Furthermore, molecular dynamics simulations showed a closed-to-open conformational change in the DOCK7 DHR-2 domain between the Cdc42- and Rac1-bound states by lobe B displacement. Our results suggest that lobe B acts as a sensor for identifying different switch 1 conformations and explain how DOCK7 recognizes both Rac1 and Cdc42. Structural Basis for the Dual Substrate Specificity of DOCK7 Guanine Nucleotide Exchange Factor.,Kukimoto-Niino M, Tsuda K, Ihara K, Mishima-Tsumagari C, Honda K, Ohsawa N, Shirouzu M Structure. 2019 Feb 16. pii: S0969-2126(19)30045-0. doi:, 10.1016/j.str.2019.02.001. PMID:30853411 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dedicator of cytokinesis protein 3D structures GTP-binding protein 3D structures

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