PreprintCited by 199DNA Repair MechanismsCRISPR and Genetic EngineeringGenomics and Chromatin Dynamics

Mutations of acidic residues in RAG1 define the active site of the V(D)J recombinase

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Kim, D. R., Dai, Y., Mundy, C. L., Yang, W., Oettinger, M. A.·1999·Genes & Development

Abstract

The RAG1 and RAG2 proteins collaborate to initiate V(D)J recombination by binding recombination signal sequences (RSSs) and making a double-strand break between the RSS and adjacent coding DNA. Like the reactions of their biochemical cousins, the bacterial transposases and retroviral integrases, cleavage by the RAG proteins requires a divalent metal ion but does not involve a covalent protein/DNA intermediate. In the transposase/integrase family, a triplet of acidic residues, commonly called a DDE motif, is often found to coordinate the metal ion used for catalysis. We show here that mutations in each of three acidic residues in RAG1 result in mutant derivatives that can bind the RSS but whose ability to catalyze either of the two chemical steps of V(D)J cleavage (nicking and hairpin formation) is severely impaired. Because both chemical steps are affected by the same mutations, a single active site appears responsible for both reactions. Two independent lines of evidence demonstrate that at least two of these acidic residues are directly involved in coordinating a divalent metal ion: The substitution of Cys for Asp allows rescue of some catalytic function, whereas an alanine substitution is no longer subject to iron-induced hydroxyl radical cleavage. Our results support a model in which the RAG1 protein contains the active site of the V(D)J recombinase and are interpreted in light of predictions about the structure of RAG1.

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  • All three core residues from the catalytic DDE triad in RAG1 proteins (residues 603, 711, and 965) necessary for V(D)J recombination are conserved in Transib TPases.

    “All three core residues from the catalytic DDE triad in the RAG1 proteins (residues 603, 711, and 965) that are necessary for V(D)J recombination [21,22] are conserved in the Transib TPases (Figures 3 and Figure S3).”

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  1. Roberts, R.J. and S.E. Halford 1993. Recognition sequences and cleavage properties. In Nucleases (ed. S.M. Linn, R.S. LLoyd, and R.J. Roberts), pp. 35-88. Cold Spring Harbor Laboratory Press, Cold Spring Harbor, NY.

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Authors
Kim, D. R., Dai, Y., Mundy, C. L., Yang, W., & Oettinger, M. A.
Affiliations
National Institutes of Health (US)
Venue
Genes & Development
Published
1999-12-01
Volume
13
Issue
23
Pages
3070-3080
ISSN
0890-9369 (ISSN-L)
OpenAlex
W1984676925
Cited by
199
References
52
Citations by year
2024: 4 · 2023: 5 · 2022: 3 · 2021: 1 · 2020: 3 · 2019: 4 · 2018: 3 · 2017: 2 · 2016: 3 · 2015: 16 · 2014: 8 · 2013: 6 · 2012: 6
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Cancer Research Institute
  • National Institutes of Health
  • National Institute of General Medical Sciences (GM58026)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › CRISPR and Genetic Engineering
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
RAG1, RAG2, V(D)J recombination, recombination signal sequences, acidic residues, active site, nicking, hairpin formation, immunoglobulin gene rearrangement
MeSH terms
Amino Acid Sequence, Animals, Aspartic Acid, Binding Sites, DNA Nucleotidyltransferases, DNA-Binding Proteins, HeLa Cells, Humans, Iron, Manganese, Molecular Sequence Data, Nuclear Proteins, Phenotype, Protein Binding, Recombinant Fusion Proteins, Structure-Activity Relationship, Gene Rearrangement, Mutagenesis, Site-Directed, Protein Structure, Secondary, Protein Structure, Tertiary, Hydroxyl Radical, Homeodomain Proteins, Amino Acid Substitution, Catalytic Domain, VDJ Recombinases, Mice

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