What question did this study set out to answer?

To determine whether partially purified APOBEC1 possesses direct cytosine-to-uracil deamination activity on DNA in vitro.

In Vitro Deamination of Cytosine to Uracil in Single-stranded DNA by Apolipoprotein B Editing Complex Catalytic Subunit 1 (APOBEC1)

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Population

In vitro model using partially purified APOBEC1 from extracts of transformed Escherichia coli

Design

Preclinical

Authors

Does not alter clinical practice; extends APOBEC1 substrate range and leaves open in vivo DNA editing roles.

To determine whether partially purified APOBEC1 possesses direct cytosine-to-uracil deamination activity on DNA in vitro.
Purified APOBEC1 enzyme extracts from transformed Escherichia coli.
Performed in vitro biochemical deamination assays on DNA substrates to assess strand specificity and local sequence context requirements.
APOBEC1 deaminated cytosine to uracil in DNA in vitro, establishing that its catalytic activity extends to both RNA and DNA substrates.
Catalytic activity on DNA was strictly restricted to single-stranded DNA and demonstrated sequence-context dependence.

Population

In vitro model using partially purified APOBEC1 from extracts of transformed Escherichia coli

Intervention

APOBEC1 enzyme

Outcome

Deamination of cytosine to uracil in DNAsurrogate

This study provides biochemical evidence that APOBEC1 can deaminate cytosine to uracil in single-stranded DNA in vitro.

Petersen‐Mahrt et al. (2003) studied this question.

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