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相关概念视频

Single-Strand DNA Binding Proteins01:03

Single-Strand DNA Binding Proteins

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For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
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The DNA Helix01:16

The DNA Helix

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Overview
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The DNA Helix01:07

The DNA Helix

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Deoxyribonucleic acid, or DNA, is the genetic material responsible for passing traits from generation to generation in all organisms and most viruses. DNA is composed of two strands of nucleotides that wind around each other to form a spring-like structure called a double helix. However, the double helix is not perfectly symmetrical. Instead, there are regularly occurring grooves in the structure. The major groove occurs where the sugar-phosphate backbones are relatively far apart. This space...
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Nucleic Acid Structure01:25

Nucleic Acid Structure

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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
DNA...
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The DNA Replication Fork01:02

The DNA Replication Fork

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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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RNA Structure01:19

RNA Structure

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The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
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RNA Secondary Structure Prediction Using High-throughput SHAPE
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RNA Secondary Structure Prediction Using High-throughput SHAPE

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小单链DNA结构预测

Yutong Shi1, Yu Shi1, Jianing Li1

  • 1Borch Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907, United States.

Journal of chemical information and modeling
|December 22, 2025
PubMed
概括
此摘要是机器生成的。

AlphaFold 3 (AF3) 显示出预测小单链DNA (ssDNA) 结构的前景,其性能优于传统方法. 分子动力学 (MD) 模拟可以进一步改善AF3预测,帮助治疗开发.

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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 计算生物学 计算生物学

背景情况:

  • 小单链DNA (ssDNA) 是关键的治疗剂,但它们的3D结构对于发育至关重要.
  • 实验性结构确定是昂贵和耗时的,限制了可用的结构数据.
  • 需要精确的计算方法来有效地预测ssDNA结构.

研究的目的:

  • 评估AlphaFold 3 (AF3) 与ssDNA结构预测传统方法的性能.
  • 评估分子动力学 (MD) 模拟对AF3生成的ssDNA结构的影响.
  • 为使用AF3和MD用于ssDNA结构采样提供指导.

主要方法:

  • 传统的多步式ssDNA结构预测方法与AlphaFold 3 (AF3) 的比较.
  • 评估使用一个数据集的149 ssDNAs跨六个结构动机.
  • 以后的分子动力学 (MD) 模拟进行或不进行AF3性能评估.

主要成果:

  • AF3表现出比传统方法更高的效率和准确性,成功率为38% (GDT=1).
  • AF3面临着更长的序列和复杂的图案的挑战,如G四重复和连接.
  • MD模拟显著提高了AF3预测ssDNA结构的质量.

结论:

  • AF3是SSDNA结构预测的宝贵工具,尽管对于复杂的案例存在局限性.
  • 将AF3与MD模拟相结合,为准确的ssDNA结构确定提供了一个强大的策略.
  • 这些发现促进了使用计算方法来推进基于ssDNA的治疗方法.