8VCU

Crystal structure of the oligomeric rMcL-1 in complex with lactulose

8VCU の概要

• エントリーDOI: 10.2210/pdb8vcu/pdb
• 関連するBIRD辞書のPRD_ID: PRD_900038
• 分子名称: Galactose-binding lectin, beta-D-galactopyranose-(1-4)-beta-D-fructofuranose, GLYCEROL, ... (7 entities in total)
• 機能のキーワード: galactose binding lectin, rmcl-1, sugar binding protein
• 由来する生物種: Mytilus californianus (California mussel)
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 74813.61

構造登録者

Hernandez-Santoyo, A.,Loera-Rubalcava, J. (登録日: 2023-12-14, 公開日: 2024-12-18, 最終更新日: 2025-05-21)

主引用文献

Loera-Rubalcava, J.,Garcia-Maldonado, E.,Rodriguez-Romero, A.,Quintero-Martinez, A.,Macias-Rubalcava, M.L.,Cano-Sanchez, P.,Ramirez-Rodriguez, M.A.,Espinosa-Perez, G.,Hernandez-Santoyo, A.
A mytilectin from Mytilus californianus: Study of its unique galactoside interactions, oligomerization patterns, and antifungal activity.
Int.J.Biol.Macromol., 308:142338-142338, 2025

PubMed Abstract: In marine invertebrate such as bivalve mollusks, lectins play a critical rol in the immune system, defending against pathogens. A novel family of lectins, named mytilectins, has been discovered in these organisms. They are noted for their antifungal, antibacterial, and anticancer properties, suggesting substantial potential for biomedical and biotechnological applications. In this study, we describe rMcL-1, a mytilectin from the mussel Mytilus californianus. We explored the binding mechanisms using crystallographic data with five different galactosides, highlighting rMcL-1's preference for α-galactosides. By analyzing amino acid variations in its three carbohydrate-binding sites, we assessed their impact on binding affinity and specificity. Interestingly, rMcL-1 is capable of binding non-galactosides, and ligands with lower affinity, such as lactose, induce significant conformational changes in specific binding sites. A novel binding site at the dimer interface was identified in the presence of lactulose. Co-crystallization experiments demonstrated that ligand binding promotes oligomerization, with the resulting quaternary structure varying depending on the sugar involved. An analysis of the puckering parameters and transglycosidic dihedral angles of the glycan moieties associated with oligomeric rMcL-1 revealed consistent conformational preferences in lactulose moieties, while raffinose and lactose exhibited greater variability. Additionally, rMcL-1 exhibited antifungal activity against several phytopathogenic fungi, including Alternaria alternata, Fusarium oxysporum, Phytophthora capsici, and Pythium aphanidermatum. Overall, this study enhances our understanding of the molecular mechanisms underlying the diverse activities of mytilectins and may aid in the design of artificial lectins with specific and improved binding properties.

PubMed: 40147653
DOI: 10.1016/j.ijbiomac.2025.142338

実験手法

X-RAY DIFFRACTION (1.77 Å)