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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
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Desarrollo de elementos de control endocíclicos para los macrociclos de péptidos

Solomon D Appavoo1, Takuya Kaji1, John R Frost1

  • 1Davenport Research Laboratories, Department of Chemistry , University of Toronto , 80 St. George Street , Toronto , Ontario M5S 3H6 , Canada.

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Los investigadores desarrollaron un nuevo método para estabilizar las conformaciones de péptidos cíclicos utilizando un motivo reducido de enlace de amida / heterociclo (RAH). Este enfoque condujo al descubrimiento de una nueva molécula que apunta a la integrina α4β7.

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Área de la Ciencia:

  • Química medicinal
  • Síntesis orgánica
  • Biología estructural

Sus antecedentes:

  • El control de la conformación del macrociclo es crucial para el descubrimiento de moléculas bioactivas.
  • La incorporación de heterociclos en péptidos cíclicos puede estabilizar sus conformaciones.
  • El desarrollo de métodos para el control de conformación aborda los desafíos en el diseño molecular.

Objetivo del estudio:

  • Para sintetizar macrociclos de péptidos con un anillo de oxadiazol y una amina endocíclica utilizando N- ((isocianimino) trifenilfosforano (Pinc).
  • Investigar los efectos conformacionales del nuevo motivo de enlace amídico reducido/heterociclo (RAH) en péptidos cíclicos.
  • Explorar la utilidad del motivo RAH en la imitación de estructuras biológicas y el descubrimiento de nuevos fármacos candidatos.

Principales métodos:

  • Síntesis de macrociclos de péptidos que incorporan un anillo de oxadiazol.
  • Análisis por resonancia magnética nuclear (RMN) de temperatura variable.
  • Simulaciones de dinámica molecular basadas en el Efecto Nuclear Overhauser (NOE).
  • Análisis conformacional tanto en soluciones acuosas como en DMSO.

Principales resultados:

  • El motivo de enlace de amida reducido/heterociclo (RAH) se instaló con éxito en los macrociclos de péptidos.
  • El motivo RAH demostró la capacidad de estabilizar las conformaciones del macrociclo tanto en agua como en DMSO.
  • Las estructuras de solución confirmaron el efecto estabilizador conformacional del motivo RAH.
  • El efecto conformacional de la RAH fue aprovechado para imitar la estructura secundaria de MAdCAM-1.

Conclusiones:

  • El motivo RAH proporciona una estrategia valiosa para estabilizar las conformaciones del macrociclo en solución.
  • Esta estabilización aborda un desafío clave en el diseño molecular de moléculas bioactivas.
  • El estudio dio como resultado el descubrimiento de un nuevo antagonista de la integrina α4β7 mediante la imitación de una estructura secundaria biológicamente relevante.