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BioAssay: AID 651606

Summary of the probe development efforts to identify inhibitors of RecBCD

The RecBCD enzyme (Exonuclease V) of Escherichia coli is a helicase-nuclease that initiates the repair of double-stranded DNA breaks by homologous recombination. The RecBCD class of enzymes is widely distributed among bacteria (1) but is apparently not present in eukaryotes. The major pathway of double-strand DNA break repair in bacteria involves the coordinated action of nuclease and helicase more ..
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AID: 651606
Data Source: The Scripps Research Institute Molecular Screening Center (RECBCD_INH_SUMMARY)
BioAssay Type: Summary, Candidate Probes/Leads with Supporting Evidence
Depositor Category: NIH Molecular Libraries Probe Production Network
BioAssay Version:
Deposit Date: 2012-09-28
Modify Date: 2013-03-22
Targets
Related Experiments
AIDNameTypeComment
651602Absorbance-based primary bacterial cell-based high throughput screening assay to identify inhibitors of RecBCD (with phage)Screeningdepositor-specified cross reference: Primary screen (RecBCD inhibitors in singlicate)
651982Absorbance-based bacterial cell-based high throughput confirmation assay to identify inhibitors of RecBCDScreeningdepositor-specified cross reference: Confirmation screen (RecBCD inhibitors in triplicate)
651983Counterscreen for inhibitors of RecBCD: Absorbance-based cell-based high throughput assay to identify inhibitors of bacterial viabilityScreeningdepositor-specified cross reference: Counterscreen (bacterial viability inhibitors in triplicate)
651984Counterscreen for RECBCD inhibitors: absorbance-based high throughput cell-based assay to identify inhibitors of AddAB recombination protein complexScreeningdepositor-specified cross reference: Counterscreen (AddAB inhibitors in triplicate)
652150Counterscreen for inhibitors of RecBCD: Absorbance-based cell-based high throughput dose response assay to identify inhibitors of bacterial viabilityConfirmatorydepositor-specified cross reference: Counterscreen dose response (cytotoxicity in triplicate)
652151Absorbance-based bacterial cell-based high throughput dose response assay to identify inhibitors of RecBCDConfirmatorydepositor-specified cross reference: Dose response (RecBCD inhibitors in triplicate)
Description:
Source (MLPCN Center Name): The Scripps Research Institute Molecular Screening Center (SRIMSC)
Affiliation: The Scripps Research Institute, TSRI
Assay Provider: Gerald R. Smith, Fred Hutchinson Cancer Research Center
Network: Molecular Library Probe Production Centers Network (MLPCN)
Grant Proposal Number: 1 R03 AI083736
Grant Proposal PI: Gerald R. Smith
External Assay ID: RECBCD_INH_SUMMARY

Name: Summary of the probe development efforts to identify inhibitors of RecBCD.

Description:

The RecBCD enzyme (Exonuclease V) of Escherichia coli is a helicase-nuclease that initiates the repair of double-stranded DNA breaks by homologous recombination. The RecBCD class of enzymes is widely distributed among bacteria (1) but is apparently not present in eukaryotes. The major pathway of double-strand DNA break repair in bacteria involves the coordinated action of nuclease and helicase activities provided by the three-subunit enzyme RecBCD, which is critical for DNA repair(2); recBCD null mutants have reduced cell viability, are hyper-sensitive to DNA damaging agents, and are deficient in homologous recombination involving linear DNA (3-5). Inhibitors of RecBCD would allow us to study the mechanism of this complex helicase-nuclease enzyme. Since this enzyme is crucial for bacterial survival during infection, we anticipate that some of these compounds will, in future work, lead to new, critically needed antibacterial drugs with few off-target effects for human use (6).

Summary of Probe Development Effort:

This probe development effort is focused on the identification of inhibitors of RecBCD. All AIDs that contain results associated with this project can be found in the "Related Bioassays" section of this Summary AID.

References:

1. Cromie, G. A. (2009) Phylogenetic ubiquity and shuffling of the bacterial RecBCD and AddAB recombination complexes, J Bacteriol 191, 5076-5084.
2. Smith, G. (2012) How RecBCD enzyme and Chi promote DNA break repair and recombination - A molecular biologist's view. Microbiol Mol Biol Rev, in press.
3. Howard-Flanders, P., and Theriot, L. (1966) Mutants of Escherichia coli K-12 defective in DNA repair and in genetic recombination, Genetics 53, 1137-1150.
4. Willetts, N. S., and Clark, A. J. (1969) Characteristics of some multiply recombination-deficient strains of Escherichia coli, J Bacteriol 100, 231-239.
5. Willetts, N. S., Clark, A. J., and Low, B. (1969) Genetic location of certain mutations conferring recombination deficiency in Escherichia coli, J Bacteriol 97, 244-249.
6. Amundsen, S. K., Spicer, T., Karabulut, A. C., Londono, L. M., Eberhardt, C., Fernandez Vega, V., Bannister, T. D., Hodder, P., and Smith, G. R. (2012) Small-Molecule Inhibitors of Bacterial AddAB and RecBCD Helicase-Nuclease DNA Repair Enzymes, ACS Chem Biol, 2012 May 18;7(5):879-91. Epub 2012 Mar 23.

Keywords:

Summary, Summary AID, exonuclease V, helicase, nuclease, RecBCD, RECBCD, RECBCDV66, RecBCD complex, recB, recC, recD, beta subunit, gamma chain, alpha chain, Escherichia coli, E. coli, bacteria, phage, T4, infection, DNA, dsDNA, DNA damage, DNA repair, DNA binding, ATP-binding, homologous recombination, recombination, Chi, inhibit, inhibition, inhibitor, optical density, OD, absorbance, HTS, high throughput screen, singlicate, primary, 1536, Scripps Florida, The Scripps Research Institute Molecular Screening Center, SRIMSC, Molecular Libraries Probe Production Centers Network, MLPCN.
Additional Information
Grant Number: 1 R03 AI083736

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