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Interlobe communication in 13C-methionine-labeled human transferrin
E J Beatty1, M C Cox, T A Frenkiel
1Department of Chemistry, Birkbeck College, University of London, U.K.
Biochemistry
|June 18, 1996
Summary
NMR studies reveal how gallium (Ga3+) binding alters transferrin structure, affecting protein interactions. These findings illuminate transferrin
Area of Science:
- Biochemistry
- Structural Biology
- Nuclear Magnetic Resonance (NMR) Spectroscopy
Background:
- Transferrin (80 kDa) is a crucial blood serum protein involved in iron transport.
- Protein conformational changes are vital for cellular receptor recognition.
- Understanding these changes requires advanced molecular probes.
Purpose of the Study:
- To investigate metal-induced conformational changes in human transferrin using NMR.
- To assign methionine (Met) resonances for structural analysis.
- To elucidate the mechanism of gallium binding and interlobe communication.
Main Methods:
- Utilized [1H, 13C] NMR spectroscopy for detailed investigations.
- Employed selective 13C labeling and NOESY-relayed [1H, 13C] HMQC.
- Studied recombinant N-lobe and deglycosylated human transferrin.
Main Results:
- Achieved complete methionine 13CH3 resonance assignments for transferrin.
- Demonstrated preferential Ga3+ binding to the C-lobe, followed by the N-lobe.
- Observed Ga3+-induced side-chain movements and interlobe communication.
Conclusions:
- Selective 13C labeling effectively probes structure and dynamics in large proteins.
- Gallium binding induces conformational changes impacting transferrin function.
- Interlobe communication is a key feature in transferrin-receptor interactions.