cysteine

简明释义

英[ˈsɪstɪˌiːn]美[ˈsɪstəˌin;ˈsɪstəˌɪn;ˈsɪstiˌi

n. （生化）半胱氨酸

英英释义

单词用法

同义词

反义词

例句

1.Cysteine, in its hydrochloride form, softens gluten due to a SHSS interchange with gluten proteins, as outlined for GSH above.

半胱氨酸(以氯化物形式存在的)会由于面筋蛋白中的SHSS交替转化而使面筋软化。

2.It is a member of a large family of proteins characterized by two conserved domains and a set of 16 conserved cysteine residues.

它是一个庞大的蛋白家族的一员，这个蛋白家族有两个保守区域和16个保守的半胱氨酸残基。

3.The process diagnosis for synthesizing reaction of N-acetyl-L-cysteine (NAC) was established by thin layer chromatography (TLC) and TLC-scanning.

建立了用薄层层析和薄层扫描法对N-乙酰-L-半胱氨酸合成进行流程诊断的方法。

4.Objective To research and to locate the gene expression of the cysteine protease in Pagumogonimus skrjabini.

目的—从基因水平研究半胱氨酸蛋白酶基因在斯氏肺吸虫童虫的表达，并进行虫体定位。

5.The results indicated that the modification of cysteine and histidine residues had no effect on the activity.

结果表明，组氨酸和半胱氨酸的修饰对活性没有影响。

6.Objective: to study the effect of Ganyanping on plasma glutathione and cysteine of rabbit model of schistosomal liver fibrosis.

目的：探讨肝炎平抗家兔血吸虫性肝纤维化的作用及对血浆谷胱甘肽及半胱氨酸水平的影响。

7.In bacteria, SAM is bound by the SAM riboswitch, which regulates genes involved in methionine or cysteine biosynthesis.

在细菌中，SAM是受了SAM核糖开关绑定的，该开关与蛋氨酸或半胱氨酸合成的基因相关。

8.Research shows that cysteine can support detoxification processes.

研究表明，半胱氨酸可以支持排毒过程。

9.Supplementing with cysteine can help improve skin health.

补充半胱氨酸有助于改善皮肤健康。

10.Foods rich in cysteine include eggs and poultry.

富含半胱氨酸的食物包括鸡蛋和禽肉。

11.The amino acid cysteine is important for protein structure.

氨基酸半胱氨酸对蛋白质结构很重要。

12.Cysteine plays a key role in the synthesis of glutathione.

半胱氨酸在谷胱甘肽的合成中发挥关键作用。

作文

Cysteine is a naturally occurring amino acid that plays a crucial role in the synthesis of proteins. It is classified as a non-essential amino acid, which means that our bodies can produce it even if we do not obtain it directly from our diet. The chemical structure of cysteine contains a thiol group, which is responsible for its unique properties and functions in biological systems. This sulfur-containing amino acid is particularly important for the formation of disulfide bonds, which help stabilize the three-dimensional structure of proteins. Disulfide bonds are critical for the proper functioning of many enzymes and structural proteins, making cysteine an essential player in maintaining cellular integrity.In addition to its role in protein structure, cysteine is also involved in various metabolic processes. It serves as a precursor for the synthesis of glutathione, one of the body's most important antioxidants. Glutathione protects cells from oxidative stress by neutralizing free radicals, which can cause cellular damage and contribute to aging and diseases such as cancer. Therefore, adequate levels of cysteine are vital for maintaining overall health and preventing oxidative damage.Dietary sources of cysteine include high-protein foods such as poultry, eggs, dairy products, and some nuts and seeds. Vegetarians and vegans can obtain cysteine from plant-based sources like legumes, whole grains, and certain vegetables, including garlic and onions. Although cysteine is generally produced by the body, certain conditions may increase the need for this amino acid, such as stress, illness, or intense physical activity. In such cases, supplementation may be beneficial, but it is always advisable to consult with a healthcare professional before starting any new supplement regimen.Research has shown that cysteine may have additional health benefits beyond its role in protein synthesis and antioxidant defense. Some studies suggest that it may help improve insulin sensitivity and support metabolic health, which could be particularly beneficial for individuals with diabetes or those at risk of developing metabolic disorders. Furthermore, cysteine has been investigated for its potential neuroprotective effects, indicating that it may play a role in brain health and cognitive function.In conclusion, cysteine is a vital amino acid that contributes significantly to protein structure, antioxidant defense, and overall health. Its ability to form disulfide bonds and serve as a precursor for glutathione highlights its importance in cellular function and protection against oxidative stress. Ensuring adequate intake of cysteine through diet or supplementation can be beneficial for maintaining optimal health, especially in individuals facing increased physiological demands. As research continues to uncover the multifaceted roles of cysteine, it is clear that this amino acid is not just a building block of proteins but also a key player in promoting well-being and longevity.

半胱氨酸是一种天然存在的氨基酸，在蛋白质合成中发挥着至关重要的作用。它被归类为非必需氨基酸，这意味着我们的身体可以自行合成它，即使我们没有从饮食中直接摄取。半胱氨酸的化学结构包含一个硫醇基团，这使其在生物系统中具有独特的性质和功能。这个含硫氨基酸对于二硫键的形成尤为重要，二硫键有助于稳定蛋白质的三维结构。二硫键对于许多酶和结构蛋白的正常功能至关重要，使得半胱氨酸成为维持细胞完整性的关键角色。除了在蛋白质结构中的作用外，半胱氨酸还参与各种代谢过程。它作为谷胱甘肽合成的前体，谷胱甘肽是身体中最重要的抗氧化剂之一。谷胱甘肽通过中和自由基来保护细胞免受氧化压力的影响，自由基可能导致细胞损伤并促进癌症等疾病的发展。因此，充足的半胱氨酸水平对于维持整体健康和防止氧化损伤至关重要。半胱氨酸的膳食来源包括高蛋白食物，如家禽、鸡蛋、乳制品以及某些坚果和种子。素食者和严格素食者可以通过豆类、全谷物以及一些蔬菜（如大蒜和洋葱）获得半胱氨酸。虽然人体通常可以合成半胱氨酸，但某些情况可能增加对这种氨基酸的需求，例如压力、疾病或剧烈的身体活动。在这种情况下，补充可能是有益的，但在开始任何新的补充方案之前，始终建议咨询医疗专业人士。研究表明，半胱氨酸可能具有超越蛋白质合成和抗氧化防御的额外健康益处。一些研究表明，它可能有助于改善胰岛素敏感性并支持代谢健康，这对糖尿病患者或面临代谢紊乱风险的人尤其有益。此外，半胱氨酸还被研究其潜在的神经保护作用，表明它可能在大脑健康和认知功能中发挥作用。总之，半胱氨酸是一种重要的氨基酸，对蛋白质结构、抗氧化防御和整体健康贡献显著。它形成二硫键和作为谷胱甘肽前体的能力突显了其在细胞功能和保护氧化压力方面的重要性。通过饮食或补充确保充足的半胱氨酸摄入对维持最佳健康是有益的，特别是在面临更高生理需求的个体中。随着研究不断揭示半胱氨酸的多方面角色，显然这种氨基酸不仅是蛋白质的构建块，也是促进健康和长寿的关键角色。