Related Experiment Video
Updated: Aug 8, 2026
20:23
A Lectin HPLC Method to Enrich Selectively-glycosylated Peptides from Complex Biological Samples
Published on: October 1, 2009
Purification and Characterization of Griffonia simplicifolia Leaf Lectins
J E Lamb1, S Shibata, I J Goldstein
1Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109.
Plant Physiology
|April 1, 1983
Summary
Griffonia simplicifolia leaves contain seed lectins GS-I, GS-II, and GS-IV. Leaf lectin GS-II exhibits distinct subunit composition and isoelectric points compared to its seed counterpart.
Area of Science:
- Plant biochemistry
- Molecular biology
- Glycobiology
Background:
- Griffonia simplicifolia is known for its seed lectins (GS-I, GS-II, GS-III, GS-IV) with specific sugar-binding properties.
- Lectins are proteins that bind carbohydrates and play roles in various biological processes.
- Investigating lectin presence and characteristics in plant leaves can reveal novel functions and distributions.
Purpose of the Study:
- To identify and characterize lectins in mature Griffonia simplicifolia leaves.
- To compare leaf lectins with known seed lectins from the same species.
- To investigate the stability and changes in seed lectins (GS-I and GS-II) during plant aging and germination.
Main Methods:
- Extraction and purification of lectins from G. simplicifolia leaves and seeds.
- Analysis of lectin subunit composition using molecular weight determination (e.g., SDS-PAGE).
- Isoelectric focusing to determine isoelectric points.
- Hemagglutination assays and glycoconjugate precipitation to assess binding properties.
- Investigation of lectin fate in aging cotyledons through electrophoretic analysis.
Main Results:
- Three of the four known seed lectins (GS-I, GS-II, GS-IV) were detected in G. simplicifolia leaves.
- Leaf GS-I and GS-IV were similar to their seed counterparts.
- Leaf GS-II differed from seed GS-II in subunit composition (two subunits vs. one) and isoelectric points.
- All identified leaf and seed lectins demonstrated similar hemagglutination and precipitation activities.
- Subunits of all lectins contained covalently bound carbohydrates; leaf GS-IV was slightly under-glycosylated.
- GS-I isolectin subtypes disappeared during imbibition and germination.
- GS-II lectin retained its electrophoretic properties over time in aging cotyledons.
Conclusions:
- Griffonia simplicifolia leaves synthesize lectins homologous to seed lectins, suggesting conserved roles.
- Leaf GS-II represents a distinct molecular form compared to seed GS-II.
- Seed lectins GS-I and GS-II exhibit differential stability during plant development and germination, with GS-I undergoing significant changes.
