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Structure, specificity, and mode of interaction for bacterial albumin-binding modules
Maria U Johansson1, Inga-Maria Frick, Hanna Nilsson
1Department of Biophysical Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden. maria.johansson@bpc.lu.se
The Journal of Biological Chemistry
|December 26, 2001
Summary
We determined the structure of protein G's albumin binding domain, revealing a three-helix bundle similar to protein PAB. This finding highlights bacterial adaptation and has implications for antibiotic use.
Area of Science:
- Microbiology
- Structural Biology
- Biochemistry
Background:
- Streptococci bacteria utilize surface proteins like protein G to bind host albumin.
- Understanding these interactions is crucial for bacterial pathogenesis and host specificity.
Purpose of the Study:
- To determine the solution structure of the albumin binding domain of protein G.
- To compare its structure and binding properties with homologous domains, such as protein PAB.
- To elucidate the albumin binding site within the GA module.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy for solution structure determination.
- Sequence identity analysis.
- Albumin binding assays using different species' albumin.
Main Results:
- Protein G's albumin binding domain folds into a left-handed three-helix bundle.
- It shares 59% sequence identity with protein PAB's albumin binding domain.
- The determined albumin binding site involves specific residues within the GA module.
- Differential binding affinities to albumin from various species were observed, correlating with bacterial host specificity.
Conclusions:
- The GA module represents a conserved structural motif with adaptable binding properties.
- Bacterial adaptation through such modules influences host specificity and pathogen ecology.
- These insights may inform strategies related to antibiotic resistance and treatment.