A lectin from elder (Sambucus nigra L.) bark.

Area of Science:

• Biochemistry
• Molecular Biology
• Phytochemistry

Background:

• Lectins are proteins with carbohydrate-binding specificity.
• Elder (Sambucus nigra) bark is a potential source of bioactive compounds.
• The Caprifoliaceae family is underrepresented in lectin research.

Purpose of the Study:

• To isolate and characterize a novel lectin from elder (Sambucus nigra) bark.
• To determine the molecular properties and subunit composition of the lectin.
• To establish the lectin's taxonomic significance within the Caprifoliaceae family.

Main Methods:

• Affinity chromatography using fetuin-agarose for lectin isolation.
• Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for subunit analysis.
• Molecular weight determination using established biochemical techniques.

Main Results:

• A tetrameric lectin with a total molecular weight of 140,000 Da was isolated.
• The lectin comprises two distinct subunits with molecular weights of 34,500 Da and 37,500 Da.
• The lectin is a glycoprotein rich in asparagine/aspartic acid, glutamine/glutamic acid, valine, and leucine.
• This represents the first reported lectin from the Caprifoliaceae family.

Conclusions:

• A novel lectin was successfully isolated and characterized from elder bark.
• The lectin's unique tetrameric structure and subunit composition were elucidated.
• This discovery expands the known repertoire of plant lectins and highlights the Caprifoliaceae family as a source for further investigation.