Related Experiment Videos
Auxin binding proteins from maize coleoptiles: purification and molecular characterization
K Palme1, J Feldwisch, T Hesse
1Max-Planck Institut für Züchtungsforschung, Köln, FRG.
Symposia of the Society for Experimental Biology
|January 1, 1990
Summary
Researchers purified a key auxin binding protein from maize coleoptiles. This protein is crucial for understanding how auxins regulate plant growth and development.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Hormones like auxins are critical regulators of plant differentiation and development.
- Identifying specific hormone receptors is essential for elucidating these regulatory mechanisms.
Purpose of the Study:
- To isolate and characterize the major auxin binding protein from maize coleoptiles.
- To obtain the complementary DNA (cDNA) sequence encoding this protein for further study.
Main Methods:
- Purification of the auxin binding protein to homogeneity from maize coleoptiles.
- Biochemical characterization including molecular weight determination and binding affinity analysis (using 1-naphthylacetic acid).
- Protein sequence analysis to design oligonucleotide probes for cDNA isolation.
Main Results:
- The major auxin binding protein was purified with an apparent molecular weight of 22,000 Da.
- The protein demonstrated specific binding to 1-naphthylacetic acid with a dissociation constant (KD) of 2.4 x 10(-7) M.
- A cDNA was isolated, and its open reading frame predicted a protein of 201 amino acids and 21,990 Da, including signal sequences relevant to protein localization within the endoplasmic reticulum.
Conclusions:
- The purified protein is a significant auxin binding protein in maize coleoptiles.
- The identified cDNA provides the genetic basis for this protein, enabling further investigation into auxin signaling pathways.
- The predicted protein structure suggests a role in intracellular auxin perception and transport regulation.