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Structure of vaccinia complement protein in complex with heparin and potential implications for complement regulation
Vannakambadi K Ganesh1, Scott A Smith, Girish J Kotwal
1Center for Biophysical Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294-4400, USA.
Summary
Vaccinia virus complement protein (VCP) binds heparin, revealing structural changes crucial for complement regulation. This finding may illuminate mechanisms of human complement regulators and related diseases.
Area of Science:
- Structural biology
- Immunology
- Virology
Background:
- Vaccinia virus complement control protein (VCP) regulates complement activation, similar to human Factor H and C4b-binding protein.
- VCP possesses heparin-binding activity essential for host interactions, mirroring functions of human complement regulators.
Purpose of the Study:
- To elucidate the structural basis of VCP's interaction with heparin.
- To understand how VCP-heparin binding influences complement regulation.
Main Methods:
- X-ray crystallography was used to determine the structure of VCP in complex with a heparin decasaccharide.
Main Results:
- The study revealed conformational changes in VCP upon heparin binding.
- These structural alterations are potentially significant for VCP's role in complement regulation.
Conclusions:
- VCP-heparin interactions offer insights into the functional mechanisms of fluid-phase complement regulators.
- Understanding these interactions could shed light on the structural basis of familial hemolytic uremic syndrome.