What question did this study set out to answer?

To characterize novel DNA-processing capabilities of the Bloom's syndrome helicase (BLM) beyond its recognized unwinding and junction-migration activities.

July 1, 2005Nucleic Acids ResearchOpen Access

The Bloom's syndrome helicase promotes the annealing of complementary single-stranded DNA

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Authors

CCChit Fang CheokAgency for Science, Technology and Research

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Implication

Biochemical analysis reveals single-stranded DNA annealing by Bloom's syndrome helicase, indicating a mechanistic role in repairing damaged replication forks.

Key Points

To characterize novel DNA-processing capabilities of the Bloom's syndrome helicase (BLM) beyond its recognized unwinding and junction-migration activities.
Assayed the strand annealing activity of purified BLM on complementary single-stranded DNA under varying cofactor conditions, including presence or absence of magnesium, ATP, and single-stranded DNA-binding proteins.
Constructed and tested series of BLM truncation mutants to isolate the specific structural domains responsible for single-stranded DNA binding and strand annealing.
Demonstrated that BLM actively promotes complementary single-stranded DNA annealing independently of magnesium ions, a process inhibited by ATP and single-stranded DNA-binding proteins.
Identified that the C-terminal domain is required for strand annealing, pinpointing a 60-amino-acid region essential for both single-stranded DNA binding and annealing activity.

Cite This Study

Chit Fang Cheok (2005) studied this question.

synapsesocial.com/papers/6a89b6bbf8670bac6e335476 https://doi.org/10.1093/nar/gki712

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Implication

Biochemical analysis reveals single-stranded DNA annealing by Bloom's syndrome helicase, indicating a mechanistic role in repairing damaged replication forks.

The Bloom's syndrome helicase promotes the annealing of complementary single-stranded DNA

Discussion

Member takes

Implication

Key Points

Cite This Study

The Bloom's syndrome helicase promotes the annealing of complementary single-stranded DNA

Discussion

Member takes

Implication

Key Points

Cite This Study

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