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Energy-releasing Steps of Glycolysis01:28

Energy-releasing Steps of Glycolysis

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Glycolysis is divided into two phases based on whether energy is utilized or released. While the first phase consumes ATP, the second phase produces energy in the form of ATP and NADH. The energy is released over a sequence of reactions that turns G3P into pyruvate. The energy-releasing phase—steps 6-10 of glycolysis—occurs twice, once for each of the two 3-carbon sugars produced during steps 1-5 of the first phase.
The first energy-releasing step—the 6th step of glycolysis...
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Glycolysis: Preparatory Phase01:21

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In cellular metabolism (the complete breakdown of glucose to extract energy),  glycolysis is the first step. Glycolysis takes place in the cytoplasm of both prokaryotic and eukaryotic cells. Glucose enters heterotrophic cells in two ways. One method is through secondary active transport, where the transport takes place against the glucose concentration gradient. The other mechanism uses a group of integral proteins called GLUT proteins, also known as glucose transporter proteins. These...
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Other Glycolytic Pathways01:24

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The pentose phosphate pathway (PPP) operates in parallel with glycolysis, facilitating the metabolism of both pentoses and glucose. This pathway consists of two distinct phases: the oxidative and non-oxidative phases. While it does not directly generate ATP, the intermediates formed during the process can integrate into glycolysis, contributing to cellular energy metabolism when required.Oxidative Phase: NADPH ProductionThe oxidative phase of the pentose phosphate pathway is primarily...
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Energy-requiring Steps of Glycolysis01:20

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Glucose is the source of nearly all energy used by organisms. The first step of converting glucose into usable energy is called glycolysis. Glycolysis occurs in the cytosol of the cell over two phases: an energy-requiring phase and an energy-releasing phase. Over the first three steps, glucose is converted into different forms and attached to two phosphate groups donated by two ATP molecules, resulting in an unstable sugar. In the next two stages, the unstable sugar splits into two sugar...
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ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
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Glycolysis

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Glycolysis, the Embden-Meyerhof pathway, is a central metabolic pathway involved in glucose catabolism. It is highly conserved across most organisms, reflecting its fundamental role in cellular energy production. This process occurs in the cytoplasm and can function both in the presence and absence of oxygen, making it versatile for various organisms and environmental conditions.Stages of GlycolysisGlycolysis is a ten-step pathway that converts glucose into pyruvate, generating a net gain of...
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D-Glyceraldehyde-3-Phosphate Dehydrogenase Structure and Function.

Michael R White1, Elsa D Garcin2

  • 1Department of Structural Biology, St. Jude Children's Research Hospital, 262 Danny Thomas Place, Memphis, TN, 28105, USA. whitem2@umbc.edu.

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Summary

Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) has diverse cellular roles beyond glycolysis, regulated by its structure and interactions. Understanding GAPDH regulation offers therapeutic potential for various diseases.

Keywords:
GAPDHGlyceraldehyde-3-phosphate dehydrogenaseInterfacesLocalizationMultifunctionalNAD+OligomerizationPost-translational modificationsStructural

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Area of Science:

  • Biochemistry and Molecular Biology
  • Cellular Biology

Background:

  • Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is primarily known for its role in glycolysis.
  • GAPDH exhibits numerous additional cellular functions critical for cell physiology.
  • These diverse functions are modulated by protein structure, interactions, and localization.

Purpose of the Study:

  • To explore the multifaceted roles of GAPDH beyond its glycolytic function.
  • To elucidate the regulatory mechanisms governing GAPDH's diverse functions.
  • To investigate the link between GAPDH function, regulation, and disease.

Main Methods:

  • Analysis of protein structure-function relationships.
  • Investigation of post-translational modifications and subcellular localization.
  • Review of biomolecular interactions and oligomerization states.

Main Results:

  • GAPDH possesses a wide array of functions regulated by its structural determinants.
  • Protein oligomerization, interactions, post-translational modifications, and localization are key regulatory mechanisms.
  • GAPDH's functions are interconnected with intermediary metabolism.
  • GAPDH is implicated in a spectrum of diseases, including pathogenic, cardiovascular, degenerative, diabetic, and tumorigenic conditions.

Conclusions:

  • GAPDH's diverse functions are intricately regulated by its structural and molecular properties.
  • Understanding GAPDH's regulatory network is crucial for deciphering its role in health and disease.
  • Targeting GAPDH regulatory mechanisms may offer novel therapeutic strategies for various pathologies.