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Related Concept Videos

Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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Related Experiment Video

Updated: May 7, 2026

Identification and Classification of Position-specific GABAA Receptor Subunit Missense Variants for Their Role In Hippocampal Pyramidal Neurons
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Structural and functional implication of RAP80 ΔGlu81 mutation.

Vikrant1, Rajan Kumar, Lumbini R Yadav

  • 1Advanced Centre for Treatment, Research and Education in Cancer, Kharghar, Navi Mumbai, Maharashtra, India.

Plos One
|September 17, 2013
PubMed
Summary

Receptor Associated Protein 80 (RAP80) is crucial for DNA repair by recruiting the BRCA1 complex to damage sites. A specific mutation (ΔE81) impairs this function, leading to repair defects and chromosomal aberrations.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Receptor Associated Protein 80 (RAP80) facilitates DNA damage repair by recruiting the BRCA1 complex.
  • RAP80 contains UIM motifs that bind to ubiquitinated H2AX, assembling the RAP80-BRCA1 complex at DNA damage sites.
  • The precise role of RAP80 in maintaining the structural integrity of the BRCA1 complex remains unclear.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying RAP80's function in DNA repair.
  • To explore the consequences of RAP80 mutations on BRCA1 complex recruitment and DNA repair.
  • To understand how RAP80 loss-of-function mutations lead to chromosomal aberrations.

Main Methods:

  • Comparative analysis of wild-type RAP80 and the RAP80 ΔE81 mutant.
  • Assessment of binding affinity to polyubiquitin chains.
  • Evaluation of RAP80 and BRCA1 complex recruitment to DNA damage sites.

Main Results:

  • The RAP80 ΔE81 mutation significantly disrupts structural characteristics.
  • Impaired binding affinity of RAP80 ΔE81 to polyubiquitin chains was observed.
  • Defective recruitment of both RAP80 and the BRCA1 complex to DNA damage sites results from the ΔE81 mutation.

Conclusions:

  • The RAP80 ΔE81 mutation compromises the structural integrity and DNA damage site recruitment of the RAP80-BRCA1 complex.
  • This defect leads to impaired homologous recombination repair and chromosomal aberrations.
  • Understanding these mechanisms could inform therapeutic strategies to counteract the effects of RAP80 mutations.