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Chapter 20: Problem 3

In the oxidative deamination of glutamate, is the hydride ion transferred to the Re face or the \(S\) face of \(\mathrm{NAD}^{+} ?\) (Review Section \(5.11 .\) )

Short Answer

Expert verified
The hydride ion is transferred to the Si face of 狈础顿鈦�.

Step by step solution

01

Understanding Oxidative Deamination

Oxidative deamination involves the removal of an amino group from a molecule, releasing ammonia and replacing it with a ketone. In this specific reaction, the conversion of glutamate to 伪-ketoglutarate is coupled with the reduction of the coenzyme 狈础顿鈦� to NADH.
02

Structure of 狈础顿鈦� and Nomenclature

In the structure of 狈础顿鈦�, the nicotinamide ring is planar, and the two faces are termed Re and Si. These terms are used to describe the stereochemistry of reactions involving such molecules. Determining if the hydride ion is transferred to the Re or Si face involves examining the orientation of the molecule and the chemical reaction path.
03

Hydride Transfer Analysis

In this reaction, a hydride ion (H鈦�) is transferred from the substrate, glutamate, to the nicotinamide ring of 狈础顿鈦�. The conformation and three-dimensional orientation of 狈础顿鈦� during the reaction complex will determine which face the hydride ion is added. According to the stereochemistry involved in this enzyme-catalyzed process, the hydride ion transfer occurs to the Si face of 狈础顿鈦� in the reaction with glutamate.
04

Conclusion

The transfer of the hydride ion to the Si face of 狈础顿鈦� is consistent with the enzyme-specific activity of glutamate dehydrogenase catalyzing this chemical reaction. This specific stereochemical preference contributes to the formation of a defined product, ensuring that the reaction produces only one of the two possible stereoisomeric forms of NADH.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Glutamate
Glutamate is an important amino acid that plays a critical role in various metabolic processes. It is prominently found in the central nervous system as a key neurotransmitter. One of its significant biochemical reactions is oxidative deamination, where it is converted into 伪-ketoglutarate.
  • This conversion helps in the release of ammonia鈥攁 vital process for nitrogen metabolism.
  • In this reaction, glutamate serves as a substrate, undergoing changes that contribute to cellular energy production and biosynthesis.
Understanding glutamate's role gives insights into cellular energy metabolism and its crucial function in supporting neurotransmission.
狈础顿鈦�
狈础顿鈦�, or Nicotinamide Adenine Dinucleotide, is a coenzyme found in all living cells. It acts as a pivotal electron carrier in various biochemical reactions, including oxidative deamination.
  • 狈础顿鈦� facilitates the transfer of electrons and hydride ions, hence switching between oxidized (狈础顿鈦�) and reduced (NADH) forms.
  • This redox property is essential in metabolic pathways like glycolysis, the citric acid cycle, and oxidative phosphorylation.
In the process involving glutamate, 狈础顿鈦� accepts electrons and a hydride ion, thus being reduced to NADH. This transformation is critical for maintaining a balance in cellular redox states.
Hydride Transfer
Hydride transfer is a fundamental chemical reaction where a hydride ion ( H鈦� ) is moved from one molecule to another. In oxidative deamination, this process is crucial for the conversion of glutamate to 伪-ketoglutarate.
  • During this reaction, glutamate transfers a hydride ion to 狈础顿鈦�, facilitating its reduction to NADH.
  • This step is enzyme-mediated, ensuring that the transfer process is efficient and follows the correct stereochemistry.
Understanding hydride transfer helps explain how electrons and protons are managed in cells, driving energy and metabolic pathways.
Stereochemistry
Stereochemistry refers to the spatial arrangement of atoms in molecules, influencing the outcome of biochemical reactions. In the example of oxidative deamination, stereochemistry determines how 狈础顿鈦� is reduced.
  • The nicotinamide ring in 狈础顿鈦� has two sides鈥擱e and Si鈥攌ey to understanding the transfer process.
  • The enzyme glutamate dehydrogenase facilitates the correct positioning, ensuring the hydride adds to the Si face of 狈础顿鈦�.
The specificity provided by stereochemistry is vital for creating the correct NADH form, avoiding unwanted byproducts and ensuring metabolic efficiency.

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The final step in lysine biosynthesis is decarboxylation of meso2,6-diaminopimelate. The reaction requires PLP as cofactor and occurs through the usual PLP-amino acid imine. Propose a mechanism.

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