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Structural and functional properties of the CO-sensing transcriptional activator CooA

โœ Scribed by Shigetoshi Aono

Book ID
117550232
Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
85 KB
Volume
1233
Category
Article
ISSN
0531-5131

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Structure-based hypothesis on the activa
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The CooA family of proteins are prokaryotic CO-sensing transcription factors that regulate the expression of genes involved in the utilization of CO as an energy source. They are homodimeric proteins that contain two hemes. Each monomer contains an N-terminal heme-binding domain and a C-terminal DNA

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CooA is a transcriptional activator containing a b-type heme as a prosthetic group. The heme in CooA is in the six-coordinate form in the ferric and ferrous state. Although the ferrous heme is coordinated by two axial ligands, it can react easily with CO to form the CO-bound heme under physiological