Enoyl CoA isomerase

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Δ32-Enoyl-CoA isomerase
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Enoyl-CoA-(∆) isomerase (

fatty acids at gamma-carbon (position 3) to trans double bonds at beta-carbon
(position 2) as below:

This enzyme has an important role in the

unsaturated fatty acids in beta oxidation
.

Mechanism

Figure 1: Reaction Mechanism of Enoyl-CoA Isomerase

Enoyl-CoA

fatty acids with double bonds at even-numbered carbon positions also produces 3-trans-enoyl-CoA in mammals and yeasts, enoyl-CoA isomerase is technically required for their metabolism as well.[3] The reaction mechanism is detailed in figure 1,[4] and the base that initiates the isomerization and NH groups that stabilize the intermediate are located on the active site of enoyl-coA isomerase
.

As it functions in the step immediately preceding the actual

oxidation and carbon-to-carbon bond cleavage, thereby shortening the fatty acid
chain.

Sub-classification

Enoyl-CoA

isomerases
can be categorized into three classes:

  • monofunctional
    mitochondrial
  • monofunctional
    peroxisomal
  • multifunctional

The monofunctional

mitochondrial enoyl Co-A isomerase: short-chain and long-chain [4].[6] In an immunoblot, antibodies were run against all enoyl CoA isomerase. However, two of these isomerases had antibody attachment: the short chain isomerase and the peroxisomal multifunctional enzyme.[6] There was one enzyme which did not have binding specificity to this antibody: mitochondrial long-chain isomerase. Long-chain isomerase was found when it eluted at a lower potassium phosphate concentration in the gradient.[6][7]
Thus, the discovery of three sub-classes of enoyl CoA isomerase was made.

Although all three classes of

mitochondrial enzyme is essential for deriving maximum energy from lipids and fueling muscles.[9]

If the enzyme is unclear, react it with an enoyl CoA Derivative. If the enzyme gives off more than one product, it is a multifunctional enzyme. If it gives off one product, it is solely enoyl Co-Al isomerase.[10]

hydratase activity.[13] The Plant form did not form a 2-cis-isomer (from enoyl-CoA hydratase) or D- or L- 3 hydroxy derivative (L-(−)-3-hydroxyacyl-CoA dehydrogenase): products of multifunctional enzyme of rat liver.[13] The turnover rates of these the two sub divisions of peroxisomes are very different. The Kcat/Km ratio in cotyledons is 10^6 M-1s-1 which outperforms the ratio .07 * 10^6 M-1s-1.[13] Due to a high turnover rate, the plant peroxisomes contain a lesser amount of enoyl-CoA isomerase than their counterparts in the rat liver.[13]

In rat liver,

Structure

All classes of enoyl-CoA

In enoyl-CoA

carbonyl oxygen of the acyl-CoA intermediate. The formation of this oxyanion hole stabilizes the transition state of the enzyme-catalyzed reaction.[4]

Figure 2: Catalytic Sites of Enoyl-CoA Isomerase in Yeast

Moreover, a

glutamate side chain to retain the proton and later deliver it back to the acyl-CoA, on a different carbon position.[4]

Figure 3: Trimer Disk of Enoyl-CoA Isomerase in Yeast

The NH-containing

peroxisomal enzymes in a yeast species, Saccharomyces cerevisiae. Their relative locations on the enzyme can be compared in figure 2.[4]

The

enzymes in Saccharomyces cerevisiae is displayed in figure 3.[20]

History

Enoyl-CoA

unicellular
organisms.

By 1994, using the

cDNA probes,[3] but by copurification with a transferase, human glutathione S-transferases.[22]

In the attempts to examine the

to be specified in the next section.

Clinical significance

In

dicarboxylic acids, a condition called dicarboxylic aciduria.[9]

More recent studies link

latency of the virus and no existing cures to rid the virus specifically,[25] HCV is a serious problem that is causing more deaths than HIV/AIDS in the United States,[26] but its threat still do not receive adequate attention. The need for a HCV-specific treatment is essential, and according to John Ward, the director of the CDC Hepatitis Division, it can save up to 120,000 lives.[26]

According to

See also

References

  1. ^ "ENZYME entry 5.3.3.8". Retrieved 1 March 2012.
  2. ^
    PMID 7829074
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    PMID 2040594.{{cite journal}}: CS1 maint: numeric names: authors list (link
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  26. ^ a b "Hepatitis C Kills More Americans Than HIV/AIDS". Voice of America, Health. 27 February 2012. Retrieved 3 March 2012.
  27. PMID 17654742
    .