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Neuron Specific Enolase (Enolase 2)

Introduction

Biological Assembly Image for 1PDY Enolase ^[3]

Enolase has three subunits (α, β, and γ) and all of these subunits are usually found in vertebrates. Enolase α is ubiquitous, found in all cells, enolase β is muscle-specific, and the γ isozyme is found only in neurons.^[4] The subunits can combine in pairs (αα, αβ, αγ, ββ, and γγ) and form the five different isozymes of enolase. It is more common to find the homodimers (αα, ββ, and γγ) in adult human cells. The αα is called enolase 1, the ββ enolase 3, and the γγ enolase 2. Each homodimer still holds their original function: Enolase 1 is non-neuronal enolase (NNE), which is found in a variety of tissues, including liver, brain, kidney, spleen, adipose, enolase 3 is muscle specific enolase (MSE), and enolase 2 neuron-specific enolase (NSE). ^[1]

NSE is the most abundant form of the glycolytic enolase found in adult neurons and is thought to serve as a growth factor in neurons. NSE is useful in studying neuronal differentiation and is, therefore, a valuable tool for visualizing the entire neuron and endocrine systems. ^[5]

Structure

Biological Assembly Image for 1TE6 Enolase 2 ^[6]

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Mechanism

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Medicine

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References

1. ↑ ^{1.0 1.1 1.2} http://en.wikipedia.org/wiki/Enolase
2. ↑ http://en.wikipedia.org/wiki/Metalloenzyme#Metalloenzymes
3. ↑ X-RAY STRUCTURE AND CATALYTIC MECHANISM OF LOBSTER ENOLASE: http://www.rcsb.org/pdb/explore/explore.do?structureId=1PDY
4. ↑ Stopped-flow studies of the reaction of d-tartronate semialdehyde-2-phosphate with human neuronal enolase and yeast enolase 1: http://www.sciencedirect.com.prox.lib.ncsu.edu/science/article/pii/S0014579310000657
5. ↑ Neuron Specific Enolase: http://www.scrippslabs.com/cancer-markers-neuron-specific-enolase-nse/
6. ↑ Crystal Structure of Human Neuron Specific Enolase at 1.8 angstrom: http://www.rcsb.org/pdb/explore/explore.do?structureId=1te6