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Solution structure of fatty acid-binding protein from human brain
Martin Rademacher1, Aukje W Zimmerman, Heinz Rüterjans
1Institut für Biophysikalische Chemie, Johann Wolfgang Goethe-Universität, Frankfurt a. M., Germany.
Molecular and Cellular Biochemistry
|December 14, 2002
Summary
This study determined the 3D structure of human brain-type fatty acid-binding protein (B-FABP) in solution using NMR. The findings reveal its typical FABP structure and close similarity to heart-type FABP.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Biophysics
Background:
- Human brain-type fatty acid-binding protein (B-FABP) plays a role in cellular fatty acid transport and metabolism.
- Understanding the solution structure of B-FABP is crucial for elucidating its function and interactions.
Purpose of the Study:
- To determine the high-resolution solution structure of human B-FABP using NMR spectroscopy.
- To compare the solution structure with existing crystal structures and related FABP family members.
Main Methods:
- Recombinant expression of unlabeled and 15N-enriched human B-FABP in E. coli.
- High-resolution multidimensional homo- and heteronuclear NMR experiments for resonance assignment.
- Calculation of the solution structure ensemble using distance constraints.
Main Results:
- Sequential assignments of 1H and 15N resonances were successfully achieved.
- An ensemble of 20 energy-minimized structures was calculated, revealing the typical FABP fold with antiparallel beta-strands and a helix-turn-helix motif.
- Minor structural differences were observed compared to the crystal structure, and a close relationship with heart-type FABP was indicated.
Conclusions:
- The solution structure of human B-FABP is consistent with the characteristic FABP fold.
- Human B-FABP shares significant structural similarities with heart-type FABP, particularly in the fatty acid binding cavity.
- These findings provide insights into the structural basis of fatty acid binding and transport by B-FABP.