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Carnitine acetyltransferase are a family of ubiquitous enzymes that play a pivotal role in cellular energy metabolism. The carnitine acetyltransferases (also known as CATs) belong to the family of enzymes known as the carnitine acyltransferases, which also includes carnitine octanoyltransferases (CrOTs) and carnitine palmityltransferase (CPTs).
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The three known classes of carnitine acyltransferases differ in their acyl group specificity. Carnitine acetyltransferase has a substrate preference for short chain acyl-CoAs whereas carnitine palmityltransferases and carnitine palmityltransferases show preference for long chain acyl-CoAs.They are found in the mitochondrial matrix. Carnitine acetyltransferases are localized in both the outer membrane and the inner membrane.
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[[Image:Carnitineacetyltransferase with carnitine.jpg | thumb]]
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Carnitine acetyltransferases (also known as CATs) are members of a large family of enzymes called carnitine acyltransferases. This family contains enzymes that play an important role in cellular energy metabolism, i.e. fatty acid oxidation. They are responsible for the directional transport of fatty acids from the cytoplasm across the inner mitochondrial membrane into the mitochondrial matrix. Hence these enzymes can be mainly found in the inner membrane of mitochondria. Carnitine acetyltransferases have a substrate preference for short chain fatty acids in their activated form (acyl-CoAs).
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As Carnitine acetyltransferases are major enzymes in fatty acid oxidation they are viewed as promising targets which can be used to develop successful therapeutics against diabetes and obesity.
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<Structure load='1ndf' size='500' frame='true' align='right' caption='Insert caption here' scene='Insert optional scene name here' />
<Structure load='1ndf' size='500' frame='true' align='right' caption='Insert caption here' scene='Insert optional scene name here' />

Revision as of 19:03, 21 December 2011


Carnitine acetyltransferases (also known as CATs) are members of a large family of enzymes called carnitine acyltransferases. This family contains enzymes that play an important role in cellular energy metabolism, i.e. fatty acid oxidation. They are responsible for the directional transport of fatty acids from the cytoplasm across the inner mitochondrial membrane into the mitochondrial matrix. Hence these enzymes can be mainly found in the inner membrane of mitochondria. Carnitine acetyltransferases have a substrate preference for short chain fatty acids in their activated form (acyl-CoAs). As Carnitine acetyltransferases are major enzymes in fatty acid oxidation they are viewed as promising targets which can be used to develop successful therapeutics against diabetes and obesity.


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Carnitine acetyltransferase

Contents

Biological function

Overall structure of Carnitine acetyltransferase

The tertiary structure of CAT consists of 20 α-helices (α1-α20) and 16 β-strands (named β1-β16) which are arranged into two equally sized domains (N and C domains ).


Substrate binding and mechanism

Regulation

Carnitine acetyltransferase deficiency and diseases

References

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