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A putative consensus sequence for the nucleotide-binding site of annexin A6
Joanna Bandorowicz-Pikula1, Aneta Kirilenko, Ruud van Deursen
1Department of Cellular Biochemistry, Nencki Institute of Experimental Biology, 02-093 Warsaw, Poland. bandor@nencki.gov.pl
Biochemistry
|July 30, 2003
Summary
Human annexin A6 (ANXA6) interacts with nucleotides primarily through its phosphate groups. This binding involves specific amino acid residues and a conserved motif, influencing ANXA6 structure and function.
Area of Science:
- Biochemistry
- Molecular Biology
- Spectroscopy
Background:
- Human annexin A6 (ANXA6) is a protein involved in various cellular processes.
- Understanding ANXA6's interaction with nucleotides is crucial for elucidating its biological functions.
Purpose of the Study:
- To investigate the nature of interactions between human annexin A6 and nucleotides.
- To identify the specific binding sites and mechanisms involved in ANXA6-nucleotide interactions.
Main Methods:
- Reaction-induced infrared difference spectroscopy (RIDS) was employed to study ANXA6-nucleotide binding.
- Fluorescence spectroscopy using a GTP analogue (TNP-GTP) was used to determine binding stoichiometry and affinity.
- Simulated molecular modeling was performed to visualize the nucleotide-binding site.
Main Results:
- ANXA6 interactions with nucleotides are dominated by phosphate groups, causing minor structural changes.
- A binding stoichiometry of 1:1 (ANXA6:nucleotide) was observed with a K(D) of 2.8 µM for TNP-GTP.
- Molecular modeling identified a nucleotide-binding site distributed across two domains, involving specific residues and a conserved F-X-X-K-Y-D/E-K-S-L motif.
Conclusions:
- The phosphate groups of nucleotides are key to ANXA6 binding.
- ANXA6 possesses a conserved motif responsible for nucleotide recognition and binding.
- These findings provide insights into the molecular mechanisms of ANXA6 function.