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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
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Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
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In aerobic organisms, the citric acid cycle is the second stage of cellular respiration wherein molecules derived from the breakdown of carbohydrates, proteins, and fats are oxidized into carbon dioxide and energy. This process is also known as the tricarboxylic acid (TCA) cycle as the first product of the cycle, citric acid, contains three carboxyl groups in its structure. Alternatively, this cycle is also referred to as the Krebs cycle, in honor of its discoverer Sir Hans Krebs.
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Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins
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"Pyruvate Carboxylase, Structure and Function".

Mikel Valle1

  • 1Structural Biology Unit, Center for Cooperative Research in Biosciences, CIC bioGUNE, 48160, Derio, Spain. mvalle@cicbiogune.es.

Sub-Cellular Biochemistry
|March 9, 2017
PubMed
Summary
This summary is machine-generated.

Pyruvate carboxylase, crucial for metabolism and gluconeogenesis, undergoes significant domain movements during its catalytic cycle. Structural studies reveal dynamic changes in its tetrameric organization, offering new insights into enzyme function.

Keywords:
Acetyl-CoAAllosteric regulationBiotin-dependent carboxylaseMultifunctional enzymePyruvate carboxylase

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Area of Science:

  • Biochemistry
  • Enzymology
  • Structural Biology

Background:

  • Pyruvate carboxylase is a key metabolic enzyme involved in the tricarboxylic acid cycle and gluconeogenesis.
  • It catalyzes the carboxylation of pyruvate to oxaloacetate, a crucial step in both pathways.
  • The enzyme is a large, multifunctional tetramer with biotin as a cofactor and acetyl-CoA as an allosteric regulator.

Purpose of the Study:

  • To present recent findings on pyruvate carboxylase functioning.
  • To focus on structural studies of the full-length enzyme.
  • To elucidate the dynamic nature of pyruvate carboxylase during catalysis.

Main Methods:

  • Structural studies of the full-length pyruvate carboxylase enzyme.
  • Analysis of enzyme oligomerization and domain movements.
  • Investigation of catalytic mechanisms and allosteric regulation.

Main Results:

  • Recent structural studies reveal large-scale domain movements within pyruvate carboxylase.
  • These movements alter the quaternary organization of the enzyme's tetrameric structure during catalysis.
  • The findings provide a dynamic view of the enzyme's functional mechanism.

Conclusions:

  • Pyruvate carboxylase exhibits significant conformational flexibility during its catalytic cycle.
  • Understanding these dynamic structural changes is key to comprehending its metabolic roles.
  • Further research into enzyme dynamics can inform therapeutic strategies targeting metabolic pathways.