Navigation Links
Peroxisome


Peroxisomes are ubiquitous organelles in eukaryotes. They consist of a single membrane that separates them from the cytosol (the internal fluid of the cell). Peroxisomes were discovered by Christian de Duve in 1965. Unlike lysosomes, which are formed in the Golgi apparatus, peroxisomes usually self-replicate by enlarging and then dividing, although there is some indication new ones may be formed directly. They also have membrane proteins that are critical for various functions, such as for importing proteins into their interiors and to proliferate and segregate into daughter cells.

Peroxisomes function to rid the cell of toxic substances, such as hydrogen peroxide, or other metabolites and contain enzymes concerned with oxygen utilization such as D-amino acid oxidase and urease oxidase . The peroxisome contains the enzyme catalase which converts H2O2 (hydrogen peroxide, a toxic byproduct of cellular metabolism) to H2O and O2, with 4H2O2 → 4H2O + 2O2.

In humans, high numbers of peroxisomes can be found in the liver, where toxic byproducts are known to accumulate. All of the enzymes found in a peroxisome are imported from the cytosol. Each enzyme transferred to a peroxisome has a special sequence at one end of the protein, called a PTS or peroxisomal targeting signal , that allows the protein to be taken into that organelle, where they then function to rid the cell of toxic substances.

Peroxisomes also degrade fatty acids and toxic compounds and catalyze the first two steps in the synthesis of ether phospholipids, which are later used to build membranes. Peroxisomes are responsible for oxidation of long-chain fatty acids and thereby generating acetyl groups.

See Also


'"/>


(Date:12/22/2014)... Conn. , Dec. 22, 2014  NXT-ID, Inc. (NASDAQ: ... biometric authentication company focused on the growing mobile commerce market, ... Apollo Robbins for the 2015 International CES debut ... Apollo Robbins will be at the NXT-ID booth January ...
(Date:12/19/2014)... Markets ( http://www.researchandmarkets.com/research/8kmfcn/iphone_5s ) has announced the ... Apple/AuthenTec TMDR92 & Sapphire - Technology Report" report ... Following the acquisition of AuthenTec in ... the iPhone 5S. It is currently the only device ...
(Date:12/19/2014)... , Dec. 18, 2014   LaunchKey , the first ... post-password and Internet of Things era, today announced the ... venture round was led by Metamorphic Ventures with participation ... Partners, VegasTechFund, and others.  LaunchKey has raised $4 million ...
Breaking Biology News(10 mins):NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 2NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 3NXT-ID Hires Master Pickpocket and Security Consultant Apollo Robbins for Wocket Smart Wallet CES 2015 Debut 4iPhone 5S Fingerprint Sensor - Apple/AuthenTec TMDR92 & Sapphire - Technology Report 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 2LaunchKey Raises $3 Million in Additional Funding Led by Metamorphic Ventures 3
... Children,s Hospital of Philadelphia has announced the establishment of ... A ceremony on Feb. 15 at the Hospital,s ... the first holder of the chair, pediatric immunologist Jordan ... will allow Dr. Orange to break new ground in ...
... brain are characteristic features of Alzheimer disease. The effect ... plays a central role in learning and memory, is ... of tau protein is largely eliminated when the corresponding ... Planck Research Unit for Structural Molecular Biology at DESY ...
... available in Spanish . Tomatoes spend ... estimated 20 percent are lost to spoilage, according to the ... Research Service (ARS) are working with colleagues at Purdue University ... may lead to tomatoes that taste better and are more ...
Cached Biology News:Modell Chair in Pediatric Immunology established 2Tau-induced memory loss in Alzheimer's mice is reversible 2Tau-induced memory loss in Alzheimer's mice is reversible 3Finding a way to extend tomato shelf-life 2
Other biology definitionOther Tags