Crystallization and preliminary X-ray analysis of mitochondrial presequence receptor Tom20 in complexes with a presequence from aldehyde dehydrogenase.
Most mitochondrial proteins are synthesized in the cytosol and must be imported into the mitochondria. Many mitochondrial precursor proteins have an extra leader sequence at their N-terminus called a presequence. Presequences are recognized by the Tom20 receptor protein. Based on the previously determined NMR structure of rat Tom20, a fragment corresponding to the core structure was generated. A cysteine residue was added at the C-terminus of the rat aldehyde dehydrogenase presequence to fix the presequence peptide onto the Tom20 fragment via an intermolecular disulfide bond. Two crystal forms of the complex were successfully obtained with different designs of the linker sequence which diffracted to 2.1 and 1.9 A. Crystal dehydration and subsequent annealing was essential to obtain good diffraction data for the 2.1 A crystal form.
Igura
Mayumi
M
Division of Structural Biology, Medical Institute of Bioregulation, Kyushu University, Maidashi 3-1-1, Fukuoka 812-8582, Japan.
Ose
Toyoyuki
T
Obita
Takayuki
T
Sato
Chiaki
C
Maenaka
Katsumi
K
Endo
Toshiya
T
Kohda
Daisuke
D
D000444:Aldehyde Dehydrogenase / Q000737:chemistry* / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D003460:Crystallization; D003545:Cysteine / Q000737:chemistry / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D026901:Membrane Transport Proteins / Q000737:chemistry* / Q000378:metabolism; D008928:Mitochondria / Q000201:enzymology* / Q000378:metabolism; D000090622:Mitochondrial Precursor Protein Import Complex Proteins; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry / Q000378:metabolism; D011487:Protein Conformation; D021122:Protein Subunits / Q000737:chemistry / Q000378:metabolism; D051381:Rats; D011956:Receptors, Cell Surface / Q000737:chemistry* / Q000378:metabolism
D026901:Membrane Transport Proteins; D000090622:Mitochondrial Precursor Protein Import Complex Proteins; D010455:Peptides; D021122:Protein Subunits; D011956:Receptors, Cell Surface; C489998:Tomm20 protein, rat; D000444:Aldehyde Dehydrogenase; D003545:Cysteine