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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
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Eukaryotic RNA Polymerases00:58

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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Translesion DNA Polymerases02:10

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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.
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Bacterial Transcription01:53

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RNA polymerase (RNAP) carries out DNA-dependent RNA synthesis in both bacteria and eukaryotes. Bacteria do not have a membrane-bound nucleus. So, transcription and translation occur simultaneously, on the same DNA template.
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Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
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The evolving tale of Pol2 function.

Matthew Gallitto1, Zhiguo Zhang2

  • 1Institute for Cancer Genetics, Department of Pediatrics, Department of Genetics and Development, Irving Cancer Research Center, Columbia University, New York, New York 10032, USA.

Genes & Development
|February 22, 2023
PubMed
Summary
This summary is machine-generated.

DNA polymerase ε mutations in the exonuclease (EXO) domain unexpectedly rescue growth defects caused by mutations in the POPS subdomain. This reveals a novel interplay critical for DNA replication and cancer insights.

Keywords:
EXO domainPol2replication elongationsister fork asymmetry

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • DNA replication errors are linked to human diseases, including cancer.
  • DNA polymerase ε (polε) is crucial for DNA replication, featuring a POLE subunit with DNA polymerase and 3'-5' exonuclease (EXO) domains.
  • Missense mutations in POLE, including the EXO domain and POPS subdomain, are found in human cancers.

Purpose of the Study:

  • To investigate the functional significance of mutations in the EXO domain and POPS subdomain of DNA polymerase ε.
  • To elucidate the interplay between the EXO domain and POPS subdomain in DNA synthesis.
  • To understand the impact of cancer-associated mutations on DNA replication and tumorigenesis.

Main Methods:

  • Analysis of cancer genome databases.
  • Identification of missense mutations in POLE, specifically in the POPS subdomain.
  • Experimental investigation of yeast Pol2 mutations (pol2-REL) and EXO domain mutations.
  • Assessment of DNA synthesis and cell growth defects.

Main Results:

  • Mutations in the EXO domain unexpectedly rescued growth defects associated with pol2-REL mutations.
  • EXO domain-mediated polymerase backtracking was identified as a mechanism impeding enzyme movement when POPS is defective.
  • A novel interplay between the EXO domain and POPS subdomain of Pol2 was uncovered, essential for efficient DNA synthesis.

Conclusions:

  • The EXO domain and POPS subdomain of Pol2 have a critical interplay for efficient DNA synthesis.
  • Understanding this interplay provides molecular insight into the role of cancer-associated mutations in tumorigenesis.
  • This research may inform future therapeutic strategies targeting cancer-associated DNA polymerase mutations.