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相关概念视频

ATP Synthase: Structure01:18

ATP Synthase: Structure

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ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
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ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Enzymes02:34

Enzymes

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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
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Induced-fit Model01:13

Induced-fit Model

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Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...
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Allosteric Proteins-ATCase01:19

Allosteric Proteins-ATCase

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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.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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Modeling an Enzyme Active Site using Molecular Visualization Freeware
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构造NTPDase-基质复合物的结构建模,以保持催化实验特征.

João Victor B de Moraes1,2, Marcelo D Polêto3, Raissa B de Castro4

  • 1General Biology Department, Universidade Federal de Viçosa, Viçosa, Minas Gerais 36570 900, Brazil.

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|October 6, 2025
PubMed
概括

乙核核酸三酸二酸酶 (E-NTPDases) 是细胞信号传递的关键,具有治疗潜力. 一种新的计算方法模拟了E-NTPDase-基质复合体,有助于药物开发的酶优化.

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科学领域:

  • 生物化学 生物化学
  • 分子生物学分子生物学
  • 酶学 是一种酶学.

背景情况:

  • 乙核核酸三酸二酸酶 (E-NTPDase) 酶通过化核酸酸盐来调节纯能和金能信号传递.
  • E-NTPDases具有显著的治疗潜力,但对其基质复合物的有限结构洞察力阻碍了酶优化.
  • 现有的分子对接方法往往无法准确地代表实验观察到的基质构造.

研究的目的:

  • 开发一种用于建模E-NTPDase-基底复合物的计算策略,该策略保留了经过实验验证的基底特征.
  • 为了利用E-NTPDase家族中保存的活性站点特征进行准确的建模.
  • 为了生成与各种核酸基质复合的人类E-NTPDases (HsNTPDases) 的可靠结构模型.

主要方法:

  • 开发了一种计算策略,将保存的活性站点特征与实验观察到的基质构造结合起来.
  • 确定了在E-NTPDase结构中常见的正规线性基质构造,包括酸盐尾部和核基.
  • 应用该方法对Homo sapiens NTPDases (HsNTPDase1-8) 用ATP,ADP,GTP,GDP,UTP和UDP进行建模.

主要成果:

  • 计算策略成功建模了与多个核酸基质复杂的HsNTPDases.
  • 模型准确地将必不可少的金属离子辅因子和催化水分子放置在活性部位内.
  • 已确定的正规基质构造为准确的酶基质相互作用研究提供了保留的特征.

结论:

  • 开发的计算方法为研究E-NTPDase-基质相互作用提供了可靠的框架.
  • 这些准确的模型为治疗应用提供了合理的酶工程.
  • 这些发现为推进E-NTPDases的治疗探索铺平了道路.