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Structural characterization of As-MIF and hJAB1 during the inhibition of cell-cycle regulation
Young-Hoon Park1, Mi Suk Jeong1, Ki-Tae Ha2
1Department of Molecular Biology, College of Natural Sciences, Pusan National University, Busan 46241, Korea.
Abstract:
The biological activities of macrophage migration inhibitory factor (MIF) might be mediated through a classical receptormediated or non-classical endocytic pathway. JAB1 (C-Jun activation domain-binding protein-1) promotes the degradation of the tumor suppressor, p53, and the cyclin-dependent kinase inhibitor, p27. When MIF and JAB1 are bound to each other in various intracellular sites, MIF inhibits the positive regulatory effects of JAB1 on the activity of AP-1. The intestinal parasite, Anisakis simplex, has an immunomodulatory effect. The molecular mechanism of action of As-MIF and human JAB1 are poorly understood. In this study, As-MIF and hJAB1 were expressed and purified with high solubility. The structure of As-MIF and hJAB1 interaction was modeled by homology modeling based on the structure of Ace-MIF. This study provides evidence indicating that the MIF domain of As-MIF interacts directly with the MPN domain of hJAB1, and four structure-based mutants of As-MIF and hJAB1 disrupt the As-MIF-hJAB1 interaction. [BMB Reports 2017; 50(5): 269-274].
Insights
Macrophage migration inhibitory factor (MIF) from the parasite Anisakis simplex interacts with human JAB1. This interaction, involving specific protein domains, impacts immune regulation and protein activity.
Area of Science:
- Molecular biology
- Parasitology
- Immunology
Background:
- Macrophage migration inhibitory factor (MIF) has diverse biological activities.
- JAB1 (C-Jun activation domain-binding protein-1) regulates tumor suppressor p53 and p27 degradation.
- MIF binding to JAB1 inhibits JAB1's positive regulatory effects on AP-1 activity.
- Anisakis simplex MIF (As-MIF) has immunomodulatory effects, but its mechanism with human JAB1 (hJAB1) is unclear.
Purpose of the Study:
- To investigate the molecular mechanism of interaction between Anisakis simplex MIF (As-MIF) and human JAB1 (hJAB1).
- To elucidate the structural basis of the As-MIF and hJAB1 interaction.
Main Methods:
- Expression and purification of soluble As-MIF and hJAB1 proteins.
- Homology modeling of the As-MIF and hJAB1 complex structure.
- Structure-based mutagenesis to identify key interaction sites.
Main Results:
- As-MIF and hJAB1 were successfully expressed and purified.
- Homology modeling predicted the interaction interface between As-MIF and hJAB1.
- The MIF domain of As-MIF directly interacts with the MPN domain of hJAB1.
- Mutagenesis studies confirmed the structural basis of the As-MIF-hJAB1 interaction.
Conclusions:
- The study reveals a direct interaction between the MIF domain of As-MIF and the MPN domain of hJAB1.
- Specific structural elements are crucial for mediating the As-MIF-hJAB1 interaction.
- Understanding this interaction provides insights into the immunomodulatory mechanisms of parasitic MIF.