Related Experiment Videos
Human milk lactoferrin binds ATP and dissociates into monomers
D V Semenov1, T G Kanyshkova, V N Buneva
1Novosibirsk Institute of Bioorganic Chemistry, Siberian Division of Russian Academy of Sciences.
Biochemistry and Molecular Biology International
|April 17, 1999
Summary
Lactoferrin (LF) binds ATP, a newly discovered function influencing its interactions. This ATP binding affects LF
Area of Science:
- Biochemistry
- Molecular Biology
- Protein Function
Background:
- The physiological role of lactoferrin (LF) remains incompletely understood.
- LF is implicated in primary defense against microbial infections.
- Known functions include DNA/RNA binding and nuclear transport for transcription activation.
Purpose of the Study:
- To investigate novel functions of lactoferrin.
- To characterize the interaction of lactoferrin with ATP.
- To determine the impact of ATP binding on LF structure and interactions.
Main Methods:
- Biochemical assays to detect and quantify ATP binding.
- Site-directed mutagenesis or domain analysis to localize the ATP-binding site.
- Analytical techniques to assess changes in protein oligomerization and interactions with other molecules (polysaccharides, DNA, proteins) upon ATP binding.
Main Results:
- Lactoferrin (LF) binds ATP with a 1:1 stoichiometry and a dissociation constant (Kd) of 0.3 mM.
- The ATP-binding site is located in the C-terminal domain of LF.
- ATP binding induces dissociation of LF oligomers and alters its interactions with polysaccharides, DNA, and proteins.
Conclusions:
- ATP binding represents a newly identified function of lactoferrin.
- This interaction modulates LF's oligomeric state and its binding affinities for various substrates.
- Understanding ATP binding to LF provides new insights into its diverse physiological roles.