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Pentaprobe: a comprehensive sequence for the one-step detection of DNA-binding activities
Ann H Y Kwan1, Robert Czolij, Joel P Mackay
1School of Molecular and Microbial Biosciences, G08, University of Sydney, NSW 2006, Australia.
Nucleic Acids Research
|October 8, 2003
Summary
Researchers developed pentaprobe, a 516 bp DNA sequence, to efficiently screen novel proteins for DNA-binding activity. This method aids in assigning function to newly identified proteins from genome projects.
Area of Science:
- Molecular Biology
- Genomics
- Protein Function Analysis
Background:
- Genome projects are rapidly identifying novel proteins.
- Efficient methods are needed to assign function to these proteins.
- Sequence-specific DNA-binding activity is a common protein function.
Purpose of the Study:
- To develop a strategy for determining sequence-specific DNA-binding activity in novel proteins.
- To create a minimal DNA sequence probe for assessing DNA-binding proteins.
Main Methods:
- A computational algorithm was used to generate a minimal 516 base pair DNA sequence (pentaprobe) covering all possible 5 bp recognition sites, utilizing overlaps and both DNA strands.
- Pentaprobe was synthesized as six overlapping double-stranded oligonucleotides.
- Gel retardation assays were employed to test DNA binding by known and putative DNA-binding proteins.
Main Results:
- Confirmed DNA binding by known proteins: zinc finger proteins (BKLF, Eos, Pegasus), Ets domain protein (PU.1), and GATA-1 fingers.
- Demonstrated that the N-terminal zinc finger domain of FOG-1 does not exhibit typical DNA-binding behavior.
- Pentaprobe successfully assessed DNA-binding activity across various protein families.
Conclusions:
- Pentaprobe is an effective tool for probing DNA-binding activity of novel proteins.
- This strategy aids in functional assignment for proteins identified in genome projects.
- Related sequences like hexaprobe may also serve as useful tools for protein function studies.