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Protein Import into the Peroxisomes

Protein Import into the Peroxisomes

Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...

Peroxisomes

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...

Peroxisomes

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...

Peroxisomes

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within peroxisomes...

Translocation of Proteins into the Mitochondria

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

Porin Insertion in the Outer Mitochondrial Membrane

Porin Insertion in the Outer Mitochondrial Membrane

Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...

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A conserved function for Inp2 in peroxisome inheritance.

Ruchi Saraya¹, Małgorzata N Cepińska, Jan A K W Kiel

¹Molecular Cell Biology, Groningen Biomolecular Sciences and Biotechnology Institute (GBB), University of Groningen, Kluyver Centre for Genomics of Industrial Fermentation, AA Haren, The Netherlands.

Biochimica Et Biophysica Acta

|February 16, 2010

Summary

In budding yeast, Inp2 protein is crucial for peroxisome inheritance by linking them to the cell

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Area of Science:

Cell Biology
Molecular Biology
Yeast Genetics

Background:

Peroxisome inheritance ensures daughter cells receive essential organelles.
The Saccharomyces cerevisiae Inp2 protein links peroxisomes to the actin-myosin motor for inheritance.
Previous studies questioned the conservation of Inp2 function across yeast species.

Purpose of the Study:

To investigate the conservation and function of Inp2-related proteins in budding yeast.
To determine the role of the Inp2 homolog in peroxisome inheritance in Hansenula polymorpha.

Main Methods:

In silico analyses to identify Inp2 homologs across 18 budding yeast species.
Experimental analysis of the identified Inp2 protein in Hansenula polymorpha.
Localization studies, protein interaction assays (e.g., with Myo2), and genetic analysis.

Main Results:

An Inp2-related protein was identified in 18 budding yeast species, though weakly conserved.
The Hansenula polymorpha Inp2 homolog localizes to peroxisomes.
Hansenula polymorpha Inp2 interacts with the motor protein Myo2.
The identified H. polymorpha Inp2 is essential for peroxisome inheritance.

Conclusions:

The function of Inp2 in peroxisome inheritance is conserved in the methylotrophic yeast Hansenula polymorpha.
Inp2 acts as a conserved linker between peroxisomes and the actomyosin cytoskeleton for organelle inheritance.