3AS4 image
Entry Detail
PDB ID:
3AS4
Keywords:
Title:
MamA AMB-1 C2221
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2010-12-09
Release Date:
2011-07-20
Method Details:
Experimental Method:
Resolution:
2.33 Å
R-Value Free:
0.27
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:MamA
Chain IDs:A
Chain Length:186
Number of Molecules:1
Biological Source:Magnetospirillum magnetotacticum
Ligand Molecules
Primary Citation
Self-recognition mechanism of MamA, a magnetosome-associated TPR-containing protein, promotes complex assembly
Proc.Natl.Acad.Sci.USA 108 E480 E487 (2011)
PMID: 21784982 DOI: 10.1073/pnas.1103367108

Abstact

The magnetosome, a biomineralizing organelle within magnetotactic bacteria, allows their navigation along geomagnetic fields. Magnetosomes are membrane-bound compartments containing magnetic nanoparticles and organized into a chain within the cell, the assembly and biomineralization of magnetosomes are controlled by magnetosome-associated proteins. Here, we describe the crystal structures of the magnetosome-associated protein, MamA, from Magnetospirillum magneticum AMB-1 and Magnetospirillum gryphiswaldense MSR-1. MamA folds as a sequential tetra-trico-peptide repeat (TPR) protein with a unique hook-like shape. Analysis of the MamA structures indicates two distinct domains that can undergo conformational changes. Furthermore, structural analysis of seven crystal forms verified that the core of MamA is not affected by crystallization conditions and identified three protein-protein interaction sites, namely a concave site, a convex site, and a putative TPR repeat. Additionally, relying on transmission electron microscopy and size exclusion chromatography, we show that highly stable complexes form upon MamA homooligomerization. Disruption of the MamA putative TPR motif or N-terminal domain led to protein mislocalization in vivo and prevented MamA oligomerization in vitro. We, therefore, propose that MamA self-assembles through its putative TPR motif and its concave site to create a large homooligomeric scaffold which can interact with other magnetosome-associated proteins via the MamA convex site. We discuss the structural basis for TPR homooligomerization that allows the proper function of a prokaryotic organelle.

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