What question did this study set out to answer?

To determine the substrate specificity and inhibition mechanisms of the RecQ family helicases human BLM and Saccharomyces cerevisiae Sgs1p.

September 15, 2002Nucleic Acids ResearchOpen Access

G4 DNA unwinding by BLM and Sgs1p: substrate specificity and substrate-specific inhibition

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Authors

MHMichael D. HuberUniversity of Washington

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Implication

Biochemical analysis reveals preferential G4 DNA unwinding by RecQ helicases, suggesting proactive clearance of DNA obstacles during replication fork progression.

Key Points

To determine the substrate specificity and inhibition mechanisms of the RecQ family helicases human BLM and Saccharomyces cerevisiae Sgs1p.
Evaluated the binding affinity and unwinding activity of BLM and Sgs1p on G4 DNA versus Holliday junction substrates.
Tested the inhibitory effects of N-methyl mesoporphyrin IX (NMM) on G4 DNA unwinding and helicase ATPase activity.
BLM and Sgs1p preferentially bound and unwound G4 DNA over Holliday junctions, with specificity mapping to the conserved central helicase domain.
NMM selectively inhibited G4 unwinding by trapping helicases on NMM-G4 DNA complexes, causing continuous ATP consumption without DNA unwinding or dissociation.

Cite This Study

Michael D. Huber (2002) studied this question.

synapsesocial.com/papers/69d8919c33ca018b39ae3b0d https://doi.org/10.1093/nar/gkf530

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Implication

Biochemical analysis reveals preferential G4 DNA unwinding by RecQ helicases, suggesting proactive clearance of DNA obstacles during replication fork progression.

G4 DNA unwinding by BLM and Sgs1p: substrate specificity and substrate-specific inhibition

Discussion

Member takes

Implication

Key Points

Cite This Study

G4 DNA unwinding by BLM and Sgs1p: substrate specificity and substrate-specific inhibition

Discussion

Member takes

Implication

Key Points

Cite This Study

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