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TitleCharacterization of the insertase for β-barrel proteins of the outer mitochondrial membrane.
Journal, issue, pagesJ Cell Biol, Vol. 199, Issue 4, Page 599-611, Year 2012
Publish dateNov 12, 2012
AuthorsAstrid Klein / Lars Israel / Sebastian W K Lackey / Frank E Nargang / Axel Imhof / Wolfgang Baumeister / Walter Neupert / Dennis R Thomas /
PubMed AbstractThe TOB-SAM complex is an essential component of the mitochondrial outer membrane that mediates the insertion of β-barrel precursor proteins into the membrane. We report here its isolation and ...The TOB-SAM complex is an essential component of the mitochondrial outer membrane that mediates the insertion of β-barrel precursor proteins into the membrane. We report here its isolation and determine its size, composition, and structural organization. The complex from Neurospora crassa was composed of Tob55-Sam50, Tob38-Sam35, and Tob37-Sam37 in a stoichiometry of 1:1:1 and had a molecular mass of 140 kD. A very minor fraction of the purified complex was associated with one Mdm10 protein. Using molecular homology modeling for Tob55 and cryoelectron microscopy reconstructions of the TOB complex, we present a model of the TOB-SAM complex that integrates biochemical and structural data. We discuss our results and the structural model in the context of a possible mechanism of the TOB insertase.
External linksJ Cell Biol / PubMed:23128244 / PubMed Central
MethodsEM (single particle)
Resolution13.4 - 15.6 Å
Structure data

EMDB-2195:
Characterization of the insertase for beta-barrel proteins of the outer mitochondrial membrane. 3-D reconstruction of the TOB complex
Method: EM (single particle) / Resolution: 14.7 Å

EMDB-2196:
Characterization of the insertase for beta-barrel proteins of the outer mitochondrial membrane. 3-D reconstruction of the TOB complex
Method: EM (single particle) / Resolution: 15.0 Å

EMDB-2197:
Characterization of the insertase for beta-barrel proteins of the outer mitochondrial membrane. 3-D reconstruction of the TOB complex
Method: EM (single particle) / Resolution: 15.0 Å

EMDB-2200:
Characterization of the insertase for beta-barrel proteins of the outer mitochondrial membrane. 3-D reconstruction of the TOB complex
Method: EM (single particle) / Resolution: 15.6 Å

EMDB-2201:
Characterization of the insertase for beta-barrel proteins of the outer mitochondrial membrane. 3-D reconstruction of the TOB complex
Method: EM (single particle) / Resolution: 14.7 Å

EMDB-2202:
Characterization of the insertase for beta-barrel proteins of the outer mitochondrial membrane. 3-D reconstruction of the TOB complex
Method: EM (single particle) / Resolution: 14.5 Å

EMDB-2203:
Characterization of the insertase for beta-barrel proteins of the outer mitochondrial membrane. 3-D reconstruction of the TOB complex
Method: EM (single particle) / Resolution: 13.4 Å

Source
  • Neurospora crassa (fungus)

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