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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...

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Related Experiment Video

Updated: Jul 3, 2026

Monitoring Stub1-Mediated Pexophagy

Monitoring Stub1-Mediated Pexophagy

Published on: May 12, 2023

Investigational methods for peroxisomal disorders.

Steven Steinberg¹, Richard Jones, Carol Tiffany

¹McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

Current Protocols in Human Genetics

|July 18, 2008

Summary

This summary is machine-generated.

Diagnosing inherited peroxisome disorders is improved by measuring specific biomarkers. These methods detect very long-chain fatty acids (VLCFA), plasmalogens, and pipecolic acid, aiding in identifying neurogenetic conditions.

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Area of Science:

Biochemistry
Cell Biology
Genetics

Background:

Peroxisomes are vital organelles involved in cellular metabolism.
Defects in peroxisome function lead to inherited disorders like X-linked adrenoleukodystrophy and Zellweger spectrum disorders.
Specific biomarkers correlate with distinct peroxisomal pathway defects.

Purpose of the Study:

To present protocols for measuring key peroxisome biomarkers.
To enable the identification of patients with neurogenetic peroxisome disorders.

Main Methods:

Capillary gas chromatography (GC) and GC-mass spectrometry are employed.
Measurement of plasma very long-chain fatty acids (VLCFA).
Quantification of erythrocyte membrane plasmalogens and plasma/urine pipecolic acid.

Main Results:

Accumulation of VLCFA indicates defects in fatty acid beta-oxidation.
Deficiency in erythrocyte plasmalogens points to plasmalogen synthesis defects.
Elevated pipecolic acid suggests pipecolic acid oxidase mislocalization.

Conclusions:

These GC-based assays effectively identify most patients with known neurogenetic peroxisome disorders.
Biomarker analysis provides a diagnostic approach for peroxisomal diseases.
The described methods are crucial for clinical diagnosis and understanding peroxisome function.