Three Dimensional Structure Prediction of Fatty Acid Binding Site on Human Transmembrane Receptor CD36
Zineb Tarhda1, Oussama Semlali1, Anas Kettani2
1Medical Biotechnology lab, Pharmacology and Toxicology Lab, Faculty of Medicine and Pharmacy, University Mohammed V Souissi, Rabat, Morocco.
Insights
Researchers predicted the 3D structure of the CD36 receptor's fatty acid binding site. This structural insight into CD36 is crucial for understanding lipid metabolism and heart disease.
Area of Science:
- Biochemistry
- Structural Biology
- Molecular Medicine
Background:
- CD36 is an integral membrane protein involved in lipid metabolism and implicated in heart diseases.
- Its interaction with ligands like oxidized low-density lipoprotein and long-chain fatty acids necessitates understanding its structure.
- Determining the 3D structure of the CD36 lipid-binding site is critical for therapeutic and diagnostic advancements.
Purpose of the Study:
- To predict the 3D structure of the fatty acid (FA) binding site within the CD36 receptor.
- To identify key amino acid residues and functional sites involved in ligand-protein interactions.
Main Methods:
- Homology modeling using the X-ray structure of Human Muscle Fatty Acid Binding Protein (PDB code: 1HMT).
- Secondary structure prediction for the CD36 target sequence [127-279 aa].
- Comparative analysis of secondary structures between 1HMT and CD36 [127-279 aa].
Main Results:
- A reliable and stable 3D model of the CD36 FA binding site [127-279 aa] was generated, with over 97.8% of residues in favored regions.
- Amino acid sequence consensus was determined through secondary structure comparisons.
- Key functional sites and residues potentially crucial for ligand binding were identified.
Conclusions:
- The predicted 3D structure provides valuable insights into CD36's role in lipid binding.
- This structural information can advance the understanding of CD36-related lipid metabolism and heart diseases.
- Identified residues offer potential targets for future drug development and therapeutic strategies.
Abstract:
CD36 is an integral membrane protein which is thought to have a hairpin-like structure with alpha-helices at the C and N terminals projecting through the membrane as well as a larger extracellular loop. This receptor interacts with a number of ligands including oxidized low density lipoprotein and long chain fatty acids (LCFAs). It is also implicated in lipid metabolism and heart diseases. It is therefore important to determine the 3D structure of the CD36 site involved in lipid binding. In this study, we predict the 3D structure of the fatty acid (FA) binding site [127-279 aa] of the CD36 receptor based on homology modeling with X-ray structure of Human Muscle Fatty Acid Binding Protein (PDB code: 1HMT). Qualitative and quantitative analysis of the resulting model suggests that this model was reliable and stable, taking in consideration over 97.8% of the residues in the most favored regions as well as the significant overall quality factor. Protein analysis, which relied on the secondary structure prediction of the target sequence and the comparison of 1HMT and CD36 [127-279 aa] secondary structures, led to the determination of the amino acid sequence consensus. These results also led to the identification of the functional sites on CD36 and revealed the presence of residues which may play a major role during ligand-protein interactions.
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