title: Preliminary crystallographic studies of yeast mitochondrial peripheral membrane protein Tim44p.
abstract: Protein translocations across mitochondrial membranes play critical roles in mitochondrion biogenesis. Protein transport from the cell cytosol to the mitochondrial matrix is carried out by the translocase of the outer membrane (TOM) complex and the translocase of the inner membrane (TIM) complexes. Tim44p is an essential mitochondrial peripheral membrane protein and a major component of the TIM23 translocon. To investigate the mechanism by which Tim44p functions in the TIM23 translocon to deliver the mitochondrial protein precursors, the yeast Tim44p was crystallized. The crystals diffract to 3.2 A using a synchrotron X-ray source and belong to space group P6(3)22, with unit-cell parameters a = 124.25, c = 77.83 A. There is one Tim44p molecule in one asymmetric unit, which corresponds to a solvent content of approximately 43%. Structure determination by MAD methods is under way.
authors.affiliation: Department of Cell Biology, Center for Biophysical Sciences and Engineering, University of Alabama, Birmingham, USA.
authors.forename: Ratnakar
authors.initials: R
authors.lastname: Josyula
authors.forename: Zhongmin
authors.initials: Z
authors.lastname: Jin
authors.forename: Deborah
authors.initials: D
authors.lastname: McCombs
authors.forename: Lawrence
authors.initials: L
authors.lastname: DeLucas
authors.forename: Bingdong
authors.initials: B
authors.lastname: Sha
mesh_terms: D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D004926:Escherichia coli / Q000235:genetics; D007425:Intracellular Membranes / Q000737:chemistry* / Q000502:physiology; D026901:Membrane Transport Proteins / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D033681:Mitochondrial Membrane Transport Proteins / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D000090622:Mitochondrial Precursor Protein Import Complex Proteins; D011498:Protein Precursors / Q000737:chemistry / Q000235:genetics / Q000502:physiology; D021381:Protein Transport / Q000235:genetics; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000235:genetics / Q000502:physiology; D017356:Synchrotrons
chemical_list: D026901:Membrane Transport Proteins; D033681:Mitochondrial Membrane Transport Proteins; D000090622:Mitochondrial Precursor Protein Import Complex Proteins; D011498:Protein Precursors; D011994:Recombinant Proteins; D029701:Saccharomyces cerevisiae Proteins; C083081:TIM23 protein, S cerevisiae; C077016:TIM44 protein, S cerevisiae