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A dynamic model of the meningococcal transferrin receptor
I C Boulton1, A R Gorringe, J K Shergill
1Centre for Applied Microbiology and Research, Salisbury, SP4 0JG, UK. icboulto@hsc.vcu.edu
Journal of Theoretical Biology
|June 22, 1999
Summary
This study proposes a dynamic model for how Neisseria meningitidis uses its transferrin receptor to capture iron. The model explains how outer membrane proteins TbpA and TbpB work together to bind and acquire iron from human transferrin.
Area of Science:
- Microbiology
- Structural Biology
- Biochemistry
Background:
- Iron is essential for bacterial growth, and pathogens must acquire it from hosts.
- Human serum limits free iron using transferrin, a key iron-binding protein.
- Neisseria species, including N. meningitidis, utilize transferrin-iron for pathogenicity.
Purpose of the Study:
- To propose a dynamic model for the Neisseria meningitidis transferrin receptor complex.
- To explain the mechanism of iron acquisition from human transferrin by N. meningitidis.
- To investigate the roles of TbpA and TbpB in transferrin binding and iron uptake.
Main Methods:
- Literature review and data synthesis.
- Development of a dynamic molecular model based on existing data.
- Analysis of protein structure and function interactions.
Main Results:
- A model where TbpB initially binds transferrin, facilitating interaction with the TbpA dimer.
- The proposed mechanism involves conformational changes in transferrin, promoting iron release.
- The model accounts for iron uptake from either lobe of transferrin.
Conclusions:
- The dynamic model explains the cooperative function of TbpA and TbpB in iron acquisition.
- The proposed mechanism is consistent with in vivo and in vitro data.
- The transferrin-binding mechanism may be conserved across Gram-negative pathogens.