6AVB

CryoEM structure of Mical Oxidized Actin (Class 1)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Catastrophic disassembly of actin filaments via Mical-mediated oxidation.

Grintsevich, E.E.Ge, P.Sawaya, M.R.Yesilyurt, H.G.Terman, J.R.Zhou, Z.H.Reisler, E.

(2017) Nat Commun 8: 2183-2183

  • DOI: 10.1038/s41467-017-02357-8
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Actin filament assembly and disassembly are vital for cell functions. MICAL Redox enzymes are important post-translational effectors of actin that stereo-specifically oxidize actin's M44 and M47 residues to induce cellular F-actin disassembly. Here w ...

    Actin filament assembly and disassembly are vital for cell functions. MICAL Redox enzymes are important post-translational effectors of actin that stereo-specifically oxidize actin's M44 and M47 residues to induce cellular F-actin disassembly. Here we show that Mical-oxidized (Mox) actin can undergo extremely fast (84 subunits/s) disassembly, which depends on F-actin's nucleotide-bound state. Using near-atomic resolution cryoEM reconstruction and single filament TIRF microscopy we identify two dynamic and structural states of Mox-actin. Modeling actin's D-loop region based on our 3.9 Å cryoEM reconstruction suggests that oxidation by Mical reorients the side chain of M44 and induces a new intermolecular interaction of actin residue M47 (M47-O-T351). Site-directed mutagenesis reveals that this interaction promotes Mox-actin instability. Moreover, we find that Mical oxidation of actin allows for cofilin-mediated severing even in the presence of inorganic phosphate. Thus, in conjunction with cofilin, Mical oxidation of actin promotes F-actin disassembly independent of the nucleotide-bound state.


    Organizational Affiliation

    Molecular Biology Institute, UCLA, Los Angeles, CA, 90095, USA. Hong.Zhou@UCLA.edu.,Molecular Biology Institute, UCLA, Los Angeles, CA, 90095, USA.,Departments of Neuroscience and Pharmacology and Neuroscience Graduate Program, The University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA. jonathan.terman@utsouthwestern.edu.,Department of Chemistry and Biochemistry, University of California (UCLA), Los Angeles, CA, 90095, USA. reisler@mbi.ucla.edu.,California NanoSystems Institute, UCLA, Los Angeles, CA, 90095, USA.,Department of Microbiology, Immunology & Molecular Genetics, UCLA, Los Angeles, CA, 90095, USA. Hong.Zhou@UCLA.edu.,California NanoSystems Institute, UCLA, Los Angeles, CA, 90095, USA. Hong.Zhou@UCLA.edu.,Molecular Biology Institute, UCLA, Los Angeles, CA, 90095, USA. reisler@mbi.ucla.edu.,Department of Chemistry and Biochemistry, University of California (UCLA), Los Angeles, CA, 90095, USA.,Departments of Neuroscience and Pharmacology and Neuroscience Graduate Program, The University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Actin, alpha skeletal muscle
C, A, B
377Oryctolagus cuniculusMutation(s): 0 
Gene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B, C
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
HIC
Query on HIC
A, B, C
L-PEPTIDE LINKINGC7 H11 N3 O2HIS
SME
Query on SME
A, B, C
L-PEPTIDE LINKINGC5 H11 N O3 SMET
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.9 Å
  • Aggregation State: HELICAL ARRAY 
  • Reconstruction Method: HELICAL 
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-01-17
    Type: Initial release
  • Version 1.1: 2019-11-06
    Type: Data collection, Other