Immunoglobulin binding protein (BiP) forms two types of dimers
Karina New1, Miguel I A Lagos-Espinoza1, Nathalie Casanova-Morales2
1Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile.
Immunoglobulin binding protein (BiP) forms distinct dimers affecting its chaperone activity. These dimers show concentration-dependent behavior, influenced by nucleotides and peptides, revealing new insights into protein regulation.
Area of Science:
- Molecular biology
- Biochemistry
- Protein dynamics
Background:
- Immunoglobulin binding protein (BiP) is a crucial chaperone protein.
- BiP facilitates protein folding and transport by binding unfolded proteins.
- BiP's activity is regulated by nucleotide binding and oligomerization.
Purpose of the Study:
- To analyze BiP monomer stability and oligomerization.
- To investigate the influence of nucleotides and peptides on BiP dimers.
- To understand the concentration-dependent behavior of BiP dimers.
Main Methods:
- Single-molecule approaches
- Mechanical activity assays
- Enzymatic activity assays
Main Results:
- BiP dimer formation exhibits biphasic concentration-dependent behavior.
- Low BiP concentrations: dimers disrupted by peptide substrate and ATP.
- High BiP concentrations: dimers unaffected by peptides, assembly inhibited by ATP and ATPγS.
Conclusions:
- Two distinct BiP dimers with unique properties are proposed.
- A high-affinity dimer involves the substrate binding domain (SBD).
- A low-affinity dimer involves interactions between the lid and nucleotide binding domain (NBD).
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