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Structure of a phage 434 Cro/DNA complex.

C Wolberger¹, Y C Dong, M Ptashne

¹Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts.

|October 27, 1988

Summary

The phage 434 Cro protein and repressor DNA-binding domain induce distinct DNA conformations. Protein binding dictates the specific DNA structure in each complex, revealing insights into gene regulation.

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Area of Science:

Structural biology
Molecular biology
Genetics

Background:

The phage 434 repressor and Cro proteins regulate viral gene expression by binding to specific DNA operator sequences.
Understanding the structural basis of this DNA-protein interaction is crucial for deciphering gene regulation mechanisms.

Purpose of the Study:

To compare the DNA conformations induced by the phage 434 Cro protein and the 434 repressor DNA-binding domain when bound to the same synthetic DNA operator.
To elucidate how protein binding influences DNA structure at a molecular level.

Main Methods:

X-ray crystallography was used to determine the high-resolution crystal structures of two complexes: phage 434 Cro protein with a synthetic DNA operator, and the 434 repressor DNA-binding domain with the same operator.

Main Results:

Significant differences in DNA conformation were observed between the two complex structures.
The binding of each protein (Cro and repressor) precisely dictates a unique conformation of the DNA operator.

Conclusions:

The phage 434 Cro protein and repressor DNA-binding domain adopt distinct structural interactions with the DNA operator.
These findings highlight the role of protein structure in shaping DNA conformation and regulating gene expression in bacteriophage 434.

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