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TitleStructure of the magnetosome-associated actin-like MamK filament at subnanometer resolution.
Journal, issue, pagesProtein Sci, Vol. 26, Issue 1, Page 93-9102, Year 2017
Publish dateAug 19, 2016
AuthorsJulien R C Bergeron / Rachel Hutto / Ertan Ozyamak / Nancy Hom / Jesse Hansen / Olga Draper / Meghan E Byrne / Sepehr Keyhani / Arash Komeili / Justin M Kollman /
PubMed AbstractMagnetotactic 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 ...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.
External linksProtein Sci / PubMed:27391173 / PubMed Central
MethodsEM (helical sym.)
Resolution6.5 Å
Structure data

8180

5jyg

EMDB-8180, PDB-5jyg:
Cryo-EM structure of the MamK filament at 6.5 A
Method: EM (helical sym.) / Resolution: 6.5 Å

Chemicals

ChemComp-MG:
Unknown entry

ChemComp-ADP:
ADENOSINE-5'-DIPHOSPHATE / ADP, energy-carrying molecule*YM

Source
  • Magnetospirillum magneticum AMB-1 (bacteria)
  • magnetospirillum magneticum (strain amb-1 / atcc 700264) (bacteria)
KeywordsSTRUCTURAL PROTEIN / Actin-like / Magnetosome / bacteria

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