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Solution structures of RseA and its complex with RseB
Kyeong Sik Jin1, Dong Young Kim, Yecheol Rho
1Department of Chemistry, National Research Laboratory for Polymer Synthesis and Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, Pohang 790-784, Republic of Korea.
The bacterial envelope stress response is modulated by RseB binding to RseA. This interaction causes structural changes, impacting RseA cleavage and stress response regulation.
Area of Science:
- Bacterial Physiology
- Molecular Biology
- Structural Biology
Background:
- The bacterial envelope stress response regulates gene expression in response to external stimuli.
- This response involves sigma(E)-dependent transcription, modulated by the interaction between RseA and RseB proteins.
Purpose of the Study:
- To investigate the structural basis of RseA and RseB interaction.
- To elucidate how RseB binding to RseA affects their structures and modulates the stress response.
Main Methods:
- Circular dichroism spectroscopy
- Small-angle X-ray scattering
- Structural analysis of RseA and its complex with RseB
Main Results:
- The periplasmic domain of RseA is unstructured without RseB.
- RseB binding induces conformational changes in both RseA and RseB, stabilizing RseA.
- Additional regions of RseA, beyond amino acids 169-186, are involved in RseB binding.
Conclusions:
- The structural changes upon RseB-RseA complex formation are crucial for regulating the bacterial envelope stress response.
- These conformational alterations are likely involved in the proteolytic cleavage of RseA, fine-tuning the stress response pathway.
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