Abstract
The three-dimensional structure of Dioclea reflexa seed lectin (DrfL)
was studied in detail by a combination of X-ray crystallography,
molecular docking and molecular dynamics. DrfL was purified by affinity
chromatography using Sephadex G-50 matrix. Its primary structure was
obtained by mass spectrometry, and crystals belonging to orthorhombic
space group P2(1)2(1)2(1) were grown by the vapor diffusion method at
293 K. The crystal structure was solved at 1.765 A and was very similar
to that of other lectins from the same subtribe. The structure presented
R-factor and R-free of 21.69% and 24.89%, respectively, with no
residues in nonallowed regions of Ramachandran plot. Similar to other
Diocleinae lectins, DrfL was capable of relaxing aortic rings via NO
induction, with CRD participation, albeit with low intensity (32%). In
silica analysis results demonstrated that DrfL could strongly interact
with complex N-glycans, components of blood vessel glycoconjugates.
Despite the high similarity among Diocleinae lectins, it was also
reported that each lectin has unique CRD properties that influence
carbohydrate binding, resulting in different biological effects
presented by these molecules. (C) 2017 Elsevier B.V. All rights
reserved.
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