Biomaterial Database

Functional and physical interactions of components of the yeast mitochondrial inner-membrane import machinery (MIM). 1995

J Blom, and P J Dekker, and M Meijer

Department of Molecular Cell Biology, BioCentrum Amsterdam, The Netherlands.

The essential mitochondrial inner-membrane protein, Mim44, is involved in the translocation of preproteins across the mitochondrial inner membrane. Two other putative components of this protein-translocation system are the integral inner-membrane proteins, Mim23 and Mim17. Here, we present genetic evidence for functional co-operation of all three proteins. Furthermore, we show that Mim23 and Mim17 are associated in a protein complex that also contains two proteins of 55 kDa and 20 kDa. We speculate that this subcomplex forms the proteinaceous import channel of the inner-membrane which transiently interacts with a less abundant peripheral complex of Mim44 and mitochondrial heat-shock protein Hsp70.

UI	MeSH Term	Description	Entries
D008565	Membrane Proteins	Proteins which are found in membranes including cellular and intracellular membranes. They consist of two types, peripheral and integral proteins. They include most membrane-associated enzymes, antigenic proteins, transport proteins, and drug, hormone, and lectin receptors.	Cell Membrane Protein,Cell Membrane Proteins,Cell Surface Protein,Cell Surface Proteins,Integral Membrane Proteins,Membrane-Associated Protein,Surface Protein,Surface Proteins,Integral Membrane Protein,Membrane Protein,Membrane-Associated Proteins,Membrane Associated Protein,Membrane Associated Proteins,Membrane Protein, Cell,Membrane Protein, Integral,Membrane Proteins, Integral,Protein, Cell Membrane,Protein, Cell Surface,Protein, Integral Membrane,Protein, Membrane,Protein, Membrane-Associated,Protein, Surface,Proteins, Cell Membrane,Proteins, Cell Surface,Proteins, Integral Membrane,Proteins, Membrane,Proteins, Membrane-Associated,Proteins, Surface,Surface Protein, Cell
D008928	Mitochondria	Semiautonomous, self-reproducing organelles that occur in the cytoplasm of all cells of most, but not all, eukaryotes. Each mitochondrion is surrounded by a double limiting membrane. The inner membrane is highly invaginated, and its projections are called cristae. Mitochondria are the sites of the reactions of oxidative phosphorylation, which result in the formation of ATP. They contain distinctive RIBOSOMES, transfer RNAs (RNA, TRANSFER); AMINO ACYL T RNA SYNTHETASES; and elongation and termination factors. Mitochondria depend upon genes within the nucleus of the cells in which they reside for many essential messenger RNAs (RNA, MESSENGER). Mitochondria are believed to have arisen from aerobic bacteria that established a symbiotic relationship with primitive protoeukaryotes. (King & Stansfield, A Dictionary of Genetics, 4th ed)	Mitochondrial Contraction,Mitochondrion,Contraction, Mitochondrial,Contractions, Mitochondrial,Mitochondrial Contractions
D002352	Carrier Proteins	Proteins that bind or transport specific substances in the blood, within the cell, or across cell membranes.	Binding Proteins,Carrier Protein,Transport Protein,Transport Proteins,Binding Protein,Protein, Carrier,Proteins, Carrier
D002462	Cell Membrane	The lipid- and protein-containing, selectively permeable membrane that surrounds the cytoplasm in prokaryotic and eukaryotic cells.	Plasma Membrane,Cytoplasmic Membrane,Cell Membranes,Cytoplasmic Membranes,Membrane, Cell,Membrane, Cytoplasmic,Membrane, Plasma,Membranes, Cell,Membranes, Cytoplasmic,Membranes, Plasma,Plasma Membranes
D000090622	Mitochondrial Precursor Protein Import Complex Proteins	Multiprotein complexes that mediate import and sorting of mitochondrial preproteins into one of the four mitochondrial subcompartments: the outer membrane, the intermembrane space, the inner membrane, and the matrix. Mitochondrial protein import machinery includes translocase of the outer membrane (TOM) complex, translocases of the inner membrane (TIM) complex, beta‐barrel pathway complex, the mitochondrial intermembrane space import and assembly (MIA) pathway complex, carrier proteins of the inner membrane and the TIM23 complex and sorting and assembly machinery (SAM) complex.	MIA Complex,MIM Complex,Mitochondrial Import Complex,Mitochondrial Intermembrane Space Import and Assembly Complex,Mitochondrial Precursor Protein Import Machinery Proteins,Mitochondrial Preprotein Translocases,Mitochondrial Protein Import Machinery Proteins,SAM Complex,Sorting and Assembly Machinery Complex,TIM Complex,TIM23 Complex,TIMM Complex,TOM Channel,TOM Complex,TOM Translocase,TOMM Complex,TOMM Machinery,Translocase Outer Mitochondrial Membrane,Translocase of the Inner Membrane Complex,Translocase of the Inner Mitochondrial Membrane Complex,Translocase of the Outer Membrane Complex,Translocases of the Inner Membrane 23 Complex,Translocases of the Inner Membrane Complex,Import Complex, Mitochondrial,Preprotein Translocases, Mitochondrial,Translocase, TOM,Translocases, Mitochondrial Preprotein
D001692	Biological Transport	The movement of materials (including biochemical substances and drugs) through a biological system at the cellular level. The transport can be across cell membranes and epithelial layers. It also can occur within intracellular compartments and extracellular compartments.	Transport, Biological,Biologic Transport,Transport, Biologic
D012441	Saccharomyces cerevisiae	A species of the genus SACCHAROMYCES, family Saccharomycetaceae, order Saccharomycetales, known as "baker's" or "brewer's" yeast. The dried form is used as a dietary supplement.	Baker's Yeast,Brewer's Yeast,Candida robusta,S. cerevisiae,Saccharomyces capensis,Saccharomyces italicus,Saccharomyces oviformis,Saccharomyces uvarum var. melibiosus,Yeast, Baker's,Yeast, Brewer's,Baker Yeast,S cerevisiae,Baker's Yeasts,Yeast, Baker
D029701	Saccharomyces cerevisiae Proteins	Proteins obtained from the species SACCHAROMYCES CEREVISIAE. The function of specific proteins from this organism are the subject of intense scientific interest and have been used to derive basic understanding of the functioning similar proteins in higher eukaryotes.	Baker's Yeast Proteins,S cerevisiae Proteins
D033681	Mitochondrial Membrane Transport Proteins	Proteins involved in the transport of specific substances across the membranes of the MITOCHONDRIA.	Membrane Transport Proteins, Mitochondrial,Mitochondrial Carrier Proteins,Mitochondrial Carriers,Mitochondrial Transport Proteins,Carrier Proteins, Mitochondrial,Transport Proteins, Mitochondrial