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Identification and characterization of a phloem-specific beta-amylase
Q Wang1, J Monroe, R D Sjölund
1Department of Biological Sciences, University of Iowa, Iowa City 52242, USA.
Plant Physiology
|November 1, 1995
Summary
Researchers developed a monoclonal antibody, RS 5, to identify a phloem-specific beta-amylase in Streptanthus tortuosus. This enzyme is also found in Arabidopsis thaliana, suggesting a conserved role in phloem function across species.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Phloem transport is crucial for plant development.
- Identifying specific proteins within phloem tissue aids in understanding its function.
- Beta-amylase is an enzyme involved in carbohydrate metabolism.
Purpose of the Study:
- To develop a specific antibody for identifying phloem proteins.
- To characterize a 57-kD protein from Streptanthus tortuosus phloem.
- To investigate the role of beta-amylase in plant phloem.
Main Methods:
- Generation of a monoclonal antibody (RS 5) against sieve elements.
- Immunofluorescence microscopy and immunoblotting techniques.
- Protein purification and partial peptide sequencing.
- Cross-reactivity studies with Arabidopsis thaliana beta-amylase.
Main Results:
- The RS 5 antibody specifically labels phloem tissue and a 57-kD protein.
- The 57-kD protein from S. tortuosus is a phloem-specific beta-amylase.
- This protein shares high sequence identity (96%) with a major beta-amylase in Arabidopsis thaliana.
- The RS 5 antibody cross-reacts with Arabidopsis thaliana beta-amylase and labels its sieve elements.
Conclusions:
- The major form of Arabidopsis thaliana beta-amylase is likely phloem-specific.
- This suggests a conserved function of beta-amylase in phloem tissue across different plant species.
- The RS 5 antibody is a valuable tool for studying phloem-specific proteins.