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相关概念视频

Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Spreading of Chromatin Modifications02:25

Spreading of Chromatin Modifications

The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer is an enzyme that can...
Chromatin Structure Regulates pre-mRNA Processing02:41

Chromatin Structure Regulates pre-mRNA Processing

In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...
Structure of a Gene01:30

Structure of a Gene

A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
Histone Modification02:32

Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Bacterial Protein Maturation01:26

Bacterial Protein Maturation

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...

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相关实验视频

Updated: Jun 20, 2026

Preparation of Hydroxy-PAAm Hydrogels for Decoupling the Effects of Mechanotransduction Cues
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基因修改宏观生物的蛋白质矩阵,以控制它们的结构和风湿性质.

Esther M Jimenez1, Carlson Nguyen1, Ahmad Shakeel2

  • 1Department of BioSciences, Rice University, Houston, Texas 77005, United States.

ACS synthetic biology
|November 27, 2024
PubMed
概括

工程生物材料 (ELM) 可以通过改变蛋白质序列来调整. 这项研究揭示了Caulobacter crescentus ELMs中弹性样多 (ELP) 长度的变化如何影响其结构和质性质.

关键词:
类似弹性质的多 (ELP)工程生物材料是生物材料.微观结构的微观结构蛋白质矩阵是一个蛋白质矩阵.具有风湿学性质的物质.

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相关实验视频

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科学领域:

  • 生物材料工程 生物材料工程
  • 合成生物学 合成生物学
  • 类风病学 类风病学 类风病学

背景情况:

  • 工程生物材料 (ELM) 旨在创建具有可调节性质的基于细胞的材料.
  • 在ELM中理解序列结构和属性关系至关重要,但仍然在很大程度上未被探索.
  • 合成生物学已经使ELM风湿学的修改成为可能,但潜在的机制需要进一步研究.

研究的目的:

  • 调查不同长度的弹性样多 (ELP) 如何影响基于Caulobacter crescentus的ELM的微观结构和粘弹性行为.
  • 阐明工程生物材料中的序列结构属性范式.
  • 通过基因改造确定新的设计原则,以定制ELM的质性质.

主要方法:

  • 使用Caulobacter crescentus设计的厘米尺度ELM具有不同的ELP长度.
  • 使用显微镜技术分析了ELP长度对材料微观结构的影响.
  • 在不同的条件下 (包括流量) 描述了ELM的粘弹性行为,以确定其质性质.

主要成果:

  • 缩短的ELP长度导致纤维更厚,静止时材料更硬.
  • 中长ELP形成了复杂的结构,在流动下增加了产量压力.
  • 延长的ELP产生了较薄的细丝,具有与中长变体相似的质性质.

结论:

  • 遗传序列修改,特别是ELP长度,显著改变ELM微观结构和质性质.
  • 该研究揭示了ELM中复杂的序列结构属性关系,与其他生物复合材料模型不同.
  • 微调基因序列为设计和控制ELM行为提供了一个强大的策略.