5UBO

Mical-oxidized Actin complex with Gelsolin Segment 1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.2 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

    Department of Chemistry and Biochemistry, University of California (UCLA), Los Angeles, CA, 90095, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Actin, alpha skeletal muscle
A
377Oryctolagus cuniculusMutation(s): 0 
Gene Names: ACTA1 (ACTA)
Find proteins for P68135 (Oryctolagus cuniculus)
Go to Gene View: ACTA1
Go to UniProtKB:  P68135
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Gelsolin
S
127Homo sapiensMutation(s): 0 
Gene Names: GSN
Find proteins for P06396 (Homo sapiens)
Go to Gene View: GSN
Go to UniProtKB:  P06396
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ATP
Query on ATP

Download SDF File 
Download CCD File 
A
ADENOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
ZKHQWZAMYRWXGA-KQYNXXCUSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, S
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MPD
Query on MPD

Download SDF File 
Download CCD File 
A
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SME
Query on SME
A
L-PEPTIDE LINKINGC5 H11 N O3 SMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.39 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.172 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 56.200α = 90.00
b = 69.250β = 90.00
c = 179.180γ = 90.00
Software Package:
Software NamePurpose
Cootmodel building
MOSFLMdata reduction
CCP4data scaling
XDSdata processing
XDSdata reduction
BUSTERrefinement
X-PLORmodel building
XSCALEdata scaling
PDB_EXTRACTdata extraction
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-12-20
    Type: Initial release
  • Version 1.1: 2018-01-17
    Type: Author supporting evidence
  • Version 1.2: 2019-10-23
    Type: Data collection, Database references