5JYG

Cryo-EM structure of the MamK filament at 6.5 A


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.5 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the magnetosome-associated actin-like MamK filament at subnanometer resolution.

Bergeron, J.R.Hutto, R.Ozyamak, E.Hom, N.Hansen, J.Draper, O.Byrne, M.E.Keyhani, S.Komeili, A.Kollman, J.M.

(2017) Protein Sci. 26: 93-102

  • DOI: 10.1002/pro.2979

  • PubMed Abstract: 
  • Magnetotactic bacteria possess cellular compartments called magnetosomes that sense magnetic fields. Alignment of magnetosomes in the bacterial cell is necessary for their function, and this is achieved through anchoring of magnetosomes to filaments ...

    Magnetotactic bacteria possess cellular compartments called magnetosomes that sense magnetic fields. Alignment of magnetosomes in the bacterial cell is necessary for their function, and this is achieved through anchoring of magnetosomes to filaments composed of the protein MamK. MamK is an actin homolog that polymerizes upon ATP binding. Here, we report the structure of the MamK filament at ∼6.5 Å, obtained by cryo-Electron Microscopy. This structure confirms our previously reported double-stranded, nonstaggered architecture, and reveals the molecular basis for filament formation. While MamK is closest in sequence to the bacterial actin MreB, the longitudinal contacts along each MamK strand most closely resemble those of eukaryotic actin. In contrast, the cross-strand interface, with a surprisingly limited set of contacts, is novel among actin homologs and gives rise to the nonstaggered architecture.


    Organizational Affiliation

    Department of Biochemistry, University of Washington, Seattle, Washington.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Actin-like ATPase
A, B, C, D, E, F, G, H, I, J, K, L, M, N
347Magnetospirillum magneticum (strain AMB-1 / ATCC 700264)Mutation(s): 0 
Find proteins for Q2W8Q6 (Magnetospirillum magneticum (strain AMB-1 / ATCC 700264))
Go to UniProtKB:  Q2W8Q6
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J, K, L, M, N
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 6.5 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-07-27
    Type: Initial release
  • Version 1.1: 2017-01-11
    Type: Database references