関連する実験動画
Updated: Aug 12, 2026

11:40
Preparation of the Mgm101 Recombination Protein by MBP-based Tagging Strategy
Published on: June 25, 2013
まとめ
ウサギの抗体は,様々な哺乳類の細胞からのDNAポリメラーゼが共通の抗原決定因子を共有していることを明らかにし,関係性を示唆しました. しかし,ターミナルデオキシヌクレオチチジルトランスファーゼは,抗原的にDNAポリメラーゼと異なる.
科学分野:
- 分子生物学は分子生物学である.
- 免疫学 免疫学とは
- バイオケミストリー バイオケミストリー
背景:
- DNAポリメラーゼは,DNA複製と修復のための重要な酵素である.
- 哺乳類の細胞には,分子量と細胞の位置によって異なる複数の形態のDNAポリメラーゼが含まれています.
- 末端デオキシヌクレオチジルトランスファーゼ (terminal deoxynucleotidyl transferase) は,独特の生化学的特性を有するDNAポリメラーゼである.
研究 の 目的:
- 哺乳類のDNAポリメラーゼの異なる形態の間の抗原的関係を調査する.
- 末端デオキシヌクレオチチジルトランスファーゼがDNAポリメラーゼと抗原決定素を共有しているかどうかを判断する.
- 抗体ベースの方法を使用して,様々な哺乳類のDNAポリメラーゼの分子関連性を調査する.
主な方法:
- 高分子量DNAポリメラーゼを,小牛の胸腺から浄化する.
- 精製された小牛のチムスのDNAポリメラーゼに対するウサギのポリクローン抗体の準備.
- 様々な哺乳類からのDNAポリメラーゼと末端デオキシヌクレオチチチルトランスファーゼに対する抗体を用いた免疫抑制アッセイ.
主要な成果:
- 準備された抗体は,様々な哺乳類の組織 (例えば,マウスのL細胞,ヒトリンパ球,ネズミの肝臓) の低分子量および高分子量DNAポリメラーゼの両方を抑制しました.
- 抗体は,小牛の胸筋から分離された末端デオキシヌクレオチチチルトランスファーゼを阻害しませんでした.
- すべての試験された哺乳類のソースからのDNAポリメラーゼに共通する抗原的決定因子が特定されました.
結論:
- 哺乳類のDNAポリメラーゼは,サイズと位置の違いにもかかわらず,共通の抗原性エピトープを共有し,分子的関連性を示しています.
- 末端デオキシヌクレオチジルトランスファーゼは免疫学的に細胞DNAポリメラーゼと異なる.
- この発見は,哺乳類の細胞における複数の形態のDNAポリメラーゼが,共通のポリペプチド配列またはサブユニットを共有していることを示唆している.
さらに関連する動画
07:38DNA Polymerase Activity Assay Using Near-infrared Fluorescent Labeled DNA Visualized by Acrylamide Gel Electrophoresis
Published on: October 6, 2017
08:53Strand-Specific Analysis of Proteins at Replicating DNA Strands by Enrichment and Sequencing of Protein-Associated Nascent DNA Method
Published on: May 2, 2025
関連する概念動画
Replication in Eukaryotes
Overview
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...
Translesion DNA Polymerases
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
Homologous Recombination
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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
Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...