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Amino Acid Biosynthetic Pathways01:29

Amino Acid Biosynthetic Pathways

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Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
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Overview of Protein Metabolism01:21

Overview of Protein Metabolism

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Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
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Proteins: From Genes to Degradation02:11

Proteins: From Genes to Degradation

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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA...
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Biosynthesis in Bacteria01:24

Biosynthesis in Bacteria

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Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
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Insulin: Biosynthesis, Chemistry, and Preparation01:25

Insulin: Biosynthesis, Chemistry, and Preparation

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The endoplasmic reticulum (ER) of pancreatic β-cells synthesizes preproinsulin, which consists of a signal peptide, A and B chains, and a C-peptide. Preproinsulin is then cleaved and folded into proinsulin, which translocates to the Golgi apparatus for sorting and packaging into secretory granules. In these granules, enzymatic clipping generates insulin and C-peptide.
Damage or functional impairment of β-cells inhibits insulin production, leading to diabetes. Diabetes treatment...
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Amino Acid Catabolism01:18

Amino Acid Catabolism

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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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β-アミノ酸を含むタンパク質のバイオシンセシス

Clarissa Melo Czekster1, Wesley E Robertson1, Allison S Walker1

  • 1Department of Chemistry, ‡Department of Molecular, Cellular, and Developmental Biology, and §Department of Molecular Biophysics and Biochemistry, Yale University , New Haven, Connecticut 06520-8107, United States.

Journal of the American Chemical Society
|April 19, 2016
PubMed
まとめ
この要約は機械生成です。

エシェリキア大腸 (E. coli) のリボソームは,非自然なベータアミノ酸をインビヴォでタンパク質に組み込むことができる. この発見は E. coli

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Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System
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科学分野:

  • 生物化学
  • 分子生物学
  • 合成生物学

背景:

  • エリトロマイシン耐性菌株のリボソームは,ベータアミノ酸をインビトロでタンパク質に組み込むことができます.
  • このプロセスは,化学的に誤ってアシレートされたtRNAとS30抽出物を必要とします.

研究 の 目的:

  • ベータアミノ酸の類型をE. coliを用いてタンパク質にインビボ組み込むことを調査する.
  • ベータアミノ酸の背骨に対するE. coliの翻訳機構の耐性を評価する.

主な方法:

  • 野生型のE. coli延長因子Tu (EF-Tu) とフェニララニル-tRNA合成酵素を使用した.
  • 変異したリボソームとこれらの成分がE. coliで共発している.
  • ベータ (((3) -フェニララニンの類型を全長ジヒドロフォラート還元酵素 (DHFR) に組み込みました.

主要な成果:

  • 変異したE. coliのリボソームを用いて,β- 3フェニララニンの同類物をDHFRに組み込むことが実証された.
  • 活性の高い変異性リボソームを持つ大腸菌株は,野生型と比較してわずか14%の倍増時間しかなく,強固な成長を示した.
  • ベータ (3) アミノ酸の耐性確認

結論:

  • E. コライとその翻訳機構は,ベータアミノ酸の骨組みをタンパク質に組み込むことを許容します.
  • この発見は,様々なベータアミノ酸を組み込むことができる直角的翻訳機構の in vivo 選択を支持する.
  • 変異したE. coliのリボソームは,様々な非自然なアミノ酸をタンパク質や他の配列プログラムされた材料に組み込む可能性を示しています.