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Macrophage migration inhibitory factor: identification of the 30-kDa MIF-related protein in bovine brain
1A. N. Bakh Institute of Biochemistry, Russian Academy of Sciences, Moscow, Russia.
Abstract:
Macrophage migration inhibitory factor (MIF) is a ubiquitous protein playing various immunologic, enzymatic, and hormonal roles. MIF was originally identified for its capacity to inhibit the random movement of macrophages in vitro. MIF is widely expressed in many tissues with particularly high levels in the nervous system. Using the reversed-phase HPLC, N-terminal microsequence analysis, and database searching, we have identified in bovine brain several MIF-like proteins. According to mass spectral analysis, the molecular masses for three of them were determined as 12,369.2, 12,299.7, and 9,496.2 Da. In addition, we have identified another MIF-related protein (29,568.9 Da) by Western blotting using anti-MIF antibody raised to MIF (having an apparent molecular weight of 12 kDa) isolated to homogeneity from bovine brain cytosol. The modified purification procedure was mainly based on exclusion- and ion-exchange chromatography. Using p-hydroxyphenylpyruvic acid as a substrate, we have demonstrated tautomerase activity of the isolated MIF. The N-terminal sequences for all MIF-like proteins were found to be identical. Several other higher molecular weight putative MIF-related proteins were also revealed in the bovine brain cytosol extract. A multifunctional nature of MIF is suggested to be a result of its occurrence in different oligomerization states in a wide variety of tissues and cells.
Insights
Researchers identified several Macrophage Migration Inhibitory Factor (MIF)-like proteins in bovine brain. These proteins share identical N-terminal sequences and exhibit tautomerase activity, suggesting diverse functions.
Area of Science:
- Biochemistry
- Immunology
- Neuroscience
Background:
- Macrophage Migration Inhibitory Factor (MIF) is a crucial protein with diverse roles in immunity, enzymatic functions, and hormonal regulation.
- MIF is widely distributed across tissues, with notable abundance in the nervous system.
- Its original identification stemmed from its ability to inhibit macrophage migration in vitro.
Purpose of the Study:
- To identify and characterize MIF-like proteins within the bovine brain.
- To investigate the enzymatic activity and structural properties of these identified proteins.
Main Methods:
- Purification techniques including reversed-phase HPLC, exclusion chromatography, and ion-exchange chromatography.
- Molecular characterization using mass spectral analysis and N-terminal microsequence analysis.
- Western blotting with anti-MIF antibodies.
Main Results:
- Identification of multiple MIF-like proteins in bovine brain with distinct molecular masses (e.g., 12,369.2, 12,299.7, 9,496.2 Da).
- Detection of a higher molecular weight MIF-related protein (29,568.9 Da) via Western blotting.
- Demonstration of tautomerase activity in isolated MIF using p-hydroxyphenylpyruvic acid.
- All identified MIF-like proteins exhibited identical N-terminal sequences.
Conclusions:
- The bovine brain harbors several MIF-like proteins, indicating a complex role for MIF in the nervous system.
- Identical N-terminal sequences suggest a common origin or precursor.
- The observed tautomerase activity and potential for different oligomerization states support MIF's multifunctional nature.
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