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Products of the Citric Acid Cycle00:53

Products of the Citric Acid Cycle

The cells of most organisms—including plants and animals—obtain usable energy through aerobic respiration, the oxygen-requiring version of cellular respiration. Aerobic respiration consists of four major stages: glycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation. The third major stage, the citric acid cycle, is also known as the Krebs cycle or tricarboxylic acid (TCA) cycle.
Nucleic Acids02:43

Nucleic Acids

Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
DNA and RNA
The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). DNA is the genetic material in all living organisms, ranging from single-celled bacteria to multicellular mammals. It is in the nucleus of eukaryotes and in the organelles, chloroplasts, and mitochondria. In prokaryotes, the...
Nucleic Acid Structure01:25

Nucleic Acid Structure

The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
DNA Structure
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Amino Acid Catabolism01:18

Amino Acid Catabolism

Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Amino Acid Biosynthetic Pathways

Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which provide...
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Biosynthesis of Nucleic Acids

Nucleic acid biosynthesis is a fundamental biochemical process that produces the purine and pyrimidine nucleotides essential for DNA and RNA synthesis. This pathway maintains a balanced nucleotide pool, preventing imbalances that could jeopardize genetic integrity and cellular function. Given the crucial role of nucleotides, their synthesis is tightly regulated to ensure proper cellular homeostasis.Purine BiosynthesisThe biosynthesis of purine nucleotides begins with ribose-5-phosphate, a...

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Los péptidos de pentaalanina cíclica N-metilada como estructuras modelo.

Jayanta Chatterjee1, Dale Mierke, Horst Kessler

  • 1Department Chemie, Lehrstuhl II für Organische Chemie, Technische Universität München, Lichtenbergstrasse 4, Garching D-85747, Germany.

Journal of the American Chemical Society
|November 23, 2006
PubMed
Resumen

La N-metilación de péptidos cíclicos mejora la biodisponibilidad y permite el control conformacional. Este estudio sintetizó y analizó péptidos N-metilados, identificando siete con conformaciones únicas estables para el diseño de fármacos.

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Área de la Ciencia:

  • Química Medicinal La Química Medicinal es el campo de la Química Medicinal.
  • Química del péptido Química del péptido
  • Biología Estructural Biología estructural.

Sus antecedentes:

  • La N-metilación de los péptidos modula la actividad, la selectividad y la biodisponibilidad (perfil de ADMET) al alterar la flexibilidad y la lipofilia.
  • Los péptidos cíclicos conformacionalmente restringidos son valiosos para el diseño de fármacos y la comprensión de los sistemas biológicos.

Objetivo del estudio:

  • Para sintetizar y caracterizar una biblioteca de péptidos cíclicos N-metilados para identificar estructuras conformacionalmente estables.
  • Establecer plantillas para el diseño racional de fármacos y el cribado espacial de sistemas de péptidos médicamente importantes.

Principales métodos:

  • Síntesis de una biblioteca de 30 péptidos cíclicos N-metilados con la secuencia cyclo(-D-Ala-L-Ala4-).
  • Análisis de Resonancia Magnética Nuclear (RMN) para determinar la estabilidad conformacional.
  • Simulaciones de geometría de distancia y dinámica molecular en DMSO explícito para el refinamiento estructural.

Principales resultados:

  • Siete de los 30 péptidos N-metilados sintetizados exhibieron conformaciones únicas y estables (>98% de la población).
  • Se aclararon las características estructurales detalladas de estos péptidos conformacionalmente restringidos.
  • El estudio proporciona una base para la comprensión de las relaciones estructura-actividad en péptidos cíclicos N-metilados.

Conclusiones:

  • La N-metilación es una estrategia eficaz para lograr la restricción conformacional en péptidos cíclicos.
  • Las conformaciones de péptidos estables identificadas pueden servir como plantillas para diseñar nuevas terapias.
  • Este trabajo facilita el cribado espacial de conformaciones bioactivas para medicamentos basados en péptidos.