Biological Assembly 1  

Global Symmetry: Helical - H  (3D View)
Global Stoichiometry: Homo 14-mer - A14 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 533.51 kDa 
• Atom Count: 35,462 
• Modelled Residue Count: 4,592 
• Deposited Residue Count: 4,858 
• Unique protein chains: 1

 5JYG

Cryo-EM structure of the MamK filament at 6.5 A

• PDB DOI: 10.2210/pdb5JYG/pdb
• EM Map EMD-8180: EMDB EMDataResource

• Classification: STRUCTURAL PROTEIN
• Organism(s): Magnetospirillum magneticum AMB-1
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2016-05-13 Released: 2016-07-27 
• Deposition Author(s): Bergeron, J.R.C., Hutto, R., Kollman, J.M.

---

Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 6.50 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: HELICAL 

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

• PubMed: 27391173 
• DOI: 10.1002/pro.2979
• Primary Citation of Related Structures:  
  5JYG


• 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 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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Actin-like ATPase	A, B, C, D, E, F, G, H, I, J, K, L, M, N	347	Magnetospirillum magneticum AMB-1	Mutation(s): 0  Gene Names: amb0965, mamK EC: 3.6.1
UniProt
Find proteins for Q2W8Q6 (Magnetospirillum magneticum (strain AMB-1 / ATCC 700264)) Explore Q2W8Q6  Go to UniProtKB:  Q2W8Q6

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	BA [auth G], DA [auth H], FA [auth I], HA [auth J], JA [auth K], LA [auth L], NA [auth M], P [auth A], PA [auth N], R [auth B], T [auth C], V [auth D], X [auth E], Z [auth F]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
MG	AA [auth G], CA [auth H], EA [auth I], GA [auth J], IA [auth K], KA [auth L], MA [auth M], O [auth A], OA [auth N], Q [auth B], S [auth C], U [auth D], W [auth E], Y [auth F]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 6.50 Å
• Aggregation State: FILAMENT 
• Reconstruction Method: HELICAL 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	Rosetta	3.5

Structure Validation

Entry History 

Deposition Data

• Released Date: 2016-07-27 
Deposition Author(s): Bergeron, J.R.C., Hutto, R., Kollman, J.M.

Revision History  

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