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Cloning and characterization of root-specific barley lectin
1MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824-1312.
Plant Physiology
|September 1, 1989
Summary
Barley lectin gene expression is localized to root tips in both embryonic and adult plants. This study isolated a barley lectin clone (BLc3) and confirmed its role in root tip lectin synthesis.
Area of Science:
- Plant Molecular Biology
- Biochemistry
- Genetics
Background:
- Cereal lectins are biochemically and antigenically related proteins found in plant embryos and adults.
- Tissue-specific localization of lectin expression is crucial for understanding plant development.
Purpose of the Study:
- To investigate the specificity of barley lectin gene expression.
- To isolate and characterize a clone encoding barley lectin.
Main Methods:
- Construction of a barley embryo cDNA library and isolation of the BLc3 clone.
- Sequence analysis of the BLc3 clone and comparison with wheat germ agglutinin.
- In situ hybridization and Northern blot analysis to determine gene expression patterns and mRNA size.
Main Results:
- The BLc3 clone, 972 nucleotides long, encodes a 212-amino acid polypeptide with high sequence identity to wheat germ agglutinin isolectin-B.
- Barley lectin gene expression is restricted to the outermost cell layers of embryonic and adult root tips.
- A 1.0 kilobyte mRNA transcript for barley lectin was detected in both embryos and root tips.
Conclusions:
- The BLc3 clone successfully encodes barley lectin, confirming its identity.
- Barley lectin expression is developmentally regulated and specifically localized to root tips.
- Barley lectin is likely synthesized as a glycosylated precursor and post-translationally modified.
