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Cofactors and Coenzymes01:27

Cofactors and Coenzymes

Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.
Cofactors and Coenzymes01:27

Cofactors and Coenzymes

Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.
Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...
Cofactors and Coenzymes01:24

Cofactors and Coenzymes

Enzymes are proteins made of amino acids. The functional group of each constituent amino acid catalyzes a wide variety of chemical reactions via ionic interactions or acid-base reactions. However, amino acids cannot catalyze oxidation-reduction and group transfer reactions and need to be aided by non-protein components called cofactors. Cofactors are also referred to as the chemical teeth of an enzyme.
Cofactors can be metallic ions or organic molecules called coenzymes. These types of helper...
cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
Amino Acid Biosynthetic Pathways01:29

Amino Acid Biosynthetic Pathways

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 provide...

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Updated: Jul 9, 2026

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
20:28

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

Published on: October 2, 2012

モジュール型および芳香型ポリケチド合成酵素に共通する鎖開始因子.

C Bisang1, P F Long, J Cortés

  • 1School of Chemistry, University of Bristol, UK.

Nature
|October 16, 1999
PubMed
まとめ

科学者たちは,抗生物質を産生する細菌のポリケチド合成に不可欠な新しい開始因子,KSQを発見しました. この因子は,鎖長因子に類似して,デカルボキシラーゼ活性を有し,芳香性PKSメカニズムに関する重要な洞察を明らかにします.

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Functional Complementation Analysis (FCA): A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
09:27

Functional Complementation Analysis (FCA): A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways

Published on: June 24, 2016

Co-expression of Multiple Chimeric Fluorescent Fusion Proteins in an Efficient Way in Plants
09:45

Co-expression of Multiple Chimeric Fluorescent Fusion Proteins in an Efficient Way in Plants

Published on: July 1, 2018

関連する実験動画

Last Updated: Jul 9, 2026

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments
20:28

A Toolkit to Enable Hydrocarbon Conversion in Aqueous Environments

Published on: October 2, 2012

Functional Complementation Analysis (FCA): A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways
09:27

Functional Complementation Analysis (FCA): A Laboratory Exercise Designed and Implemented to Supplement the Teaching of Biochemical Pathways

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Co-expression of Multiple Chimeric Fluorescent Fusion Proteins in an Efficient Way in Plants
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科学分野:

  • バイオケミストリー バイオケミストリー
  • 分子生物学は分子生物学である.
  • 微生物学 微生物学とは

背景:

  • ポリケチド合成酵素 (PKSs) は,Streptomycesおよび関連する細菌の重要な酵素であり,抗生物質および抗がん化合物を含む多様な生物活性代謝産物を生成します.
  • アロマティックPKSにおけるスターターユニットの選択を制御する正確なメカニズムは,ほとんど解明されていないままです.
  • PKSの発症を理解することは,代謝工学と薬剤発見に不可欠です.

研究 の 目的:

  • アロマティックポリケチド合成酵素におけるスタートユニット選択の分子基礎を解明する.
  • ポリケチド鎖の開始に関与する新しい要因を特定し,特徴づけること.
  • これらの誘発因子の酵素活性と構造的特徴を調査する.

主な方法:

  • 精製されたタンパク質成分のデカルボキシラーゼ活性を決定する生化学的分析.
  • サイト・ディレクテッド・ミュータゲネシス (Site-directed mutagenesis) は,特定のアミノ酸残基,特にグルタミン (Glutamine) の役割を調べるためのものです.
  • 誘発因子とケトシンタゼドメインの比較構造分析.

主要な成果:

  • アロマティックPKSにおける重要な初期因子として,以前は特徴づけられなかったドメイン,KSQ (ケトシンタゼのようなQ) を特定した.
  • KSQと"鎖長因子"が,マロニルアシルキャリアタンパク質 (ACP) にデカルボキシラーゼ活性を示すことが実証されました.
  • ケトシンタゼドメインの活性部位システインを代用する保存されたグルタミン残基は,デカルボキシラーゼ活性とポリケチド合成の両方にとって不可欠であることを発見しました.

結論:

  • KSQドメインと鎖長因子は,鎖の長さの決定だけでなく,ポリケチド鎖の開始に不可欠です.
  • 保存されたグルタミン残基は,ポリケチド生物合成を開始するために必要なデカルボキシラーゼ活性において重要な役割を果たします.
  • この発見は,芳香性PKSの発起の新たなメカニズム的理解を提供し,合成生物学のためのターゲットを提供します.