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Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
Published on: March 10, 2021
Solution structures of human and porcine beta-microseminoprotein
Houman Ghasriani1, Kaare Teilum, Ylva Johnsson
1Department of Biophysical Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden.
Journal of Molecular Biology
|August 26, 2006
Summary
Beta-microseminoprotein (MSP) exhibits conserved 3D structures across species, despite sequence variability. Its two-domain structure, revealed by NMR, differs from previous models, highlighting evolutionary conservation of protein fold.
Area of Science:
- Structural biology
- Biochemistry
- Evolutionary biology
Background:
- Beta-microseminoprotein (MSP) is a cysteine-rich protein found in seminal plasma and other organisms.
- Its function remains largely unknown, though it binds to CRISP-3 in neutrophils.
- Sequence variability across species raises questions about the evolutionary conservation of its 3D structure.
Purpose of the Study:
- To determine the 3D solution structures of human and porcine MSP using NMR.
- To investigate the evolutionary conservation of MSP's structure.
- To clarify the structural differences compared to previously published models.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy was used to determine the solution structures of human and porcine MSP.
- Comparative analysis of the determined structures and amino acid sequences.
Main Results:
- Both human and porcine MSP share highly similar 3D structures, with conserved secondary structure elements.
- MSP features a beta-sheet-rich, two-domain architecture: an N-terminal Greek key motif domain and a C-terminal domain with unique beta-sheet arrangements.
- The overall fold is extended, with domains connected by backbone, a disulfide bond, and terminus interactions.
- A previously published porcine MSP structure showed a different domain orientation, likely due to misinterpretation of NOE data.
Conclusions:
- The 3D structure of MSP is evolutionarily conserved between humans and pigs, despite 51% sequence identity.
- The determined structure provides a more accurate representation of MSP's fold, correcting previous interpretations.
- Understanding MSP's structure is crucial for elucidating its function and interactions.
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