相关实验视频
Updated: Jun 28, 2026

12:02
Molecular Evolution of the Tre Recombinase
Published on: May 29, 2008
概括
一个纠正澄清了过氧化物依赖氧化产生更多的抗[a]二醇环氧化物 (BPDE) 而不是细胞染色体P-450依赖的环氧化. 这一发现对于理解多环芳的致癌性至关重要.
科学领域:
- 生物化学 生物化学
- 毒理学 毒理学 毒理学
- 有机化学 有机化学
背景情况:
- 多环芳 (PAH) 是与癌症有关的环境污染物.
- 酸的新陈代谢,特别是酸,产生反应性中间体.
- 二醇环氧化物 (BPDE) 是一种关键的代谢物,涉及PAH诱导的DNA损伤和致癌.
研究的目的:
- 纠正有关抗BPDE的相对产量的陈述.
- 为了澄清参与BPDE形成的代谢途径.
- 为了完善对PAH致癌机制的理解.
主要方法:
- 对以前发表的句子进行了纠正.
- 代谢途径的比较:依赖过氧化物的氧化与依赖细胞P-450的环氧化.
- 对BPDE立体异构体生产比率的分析.
主要成果:
- 通过过氧化物依赖氧化产生更高比例的抗BPDE.
- 循环P-450依赖的环氧化产生较低比例的抗BPDE.
- 校正影响了在PAH代谢过程中BPDE立体异构体形成的理解.
结论:
- 修订后的声明准确地反映了来自不同代谢途径的抗BPDE的比较产量.
- 准确了解BPDE形成途径对于评估PAH致癌风险至关重要.
- 这一澄清有助于对多环碳化合物致癌的准确理解.
相关概念视频
Proofreading
Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
Proofreading
Synthesis of new DNA molecules starts when DNA polymerase links nucleotides together in a sequence that is complementary to the template DNA strand. DNA polymerase has a higher affinity for the correct base to ensure fidelity in DNA replication. The DNA polymerase furthermore proofreads during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.Errors during Replication Are Corrected by the DNA Polymerase EnzymeGenomic DNA is synthesized in...
Termination of Translation
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Termination of Translation
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Proofreading
Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Errors During Replication are Corrected by the DNA Polymerase Enzyme
Variance
The deviations show how spread out the data are about the mean. A positive deviation occurs when the data value exceeds the mean, whereas a negative deviation occurs when the data value is less than the mean. If the deviations are added, the sum is always zero. So one cannot simply add the deviations to get the data spread. By squaring the deviations, the numbers are made positive; thus, their sum will also be positive.The standard deviation measures the spread in the same units as the data.

