Molecule of the Month: Phytohormone Receptor DWARF14
Some phytohormones mobilize the cell’s protein degradation machinery to regulate plant growth and development.
D14 in Action
Rise from the Ashes
Exploring the Structure
Structure of D14
D14 uses a classic catalytic triad of serine-histidine-aspartate amino acids to perform its cleavage reaction, similar to the triad found in serine proteases. Structures have been determined for several steps in the process. Three structures are included in this interactive JSmol: PDB entry 3w04 (not shown in the illustration) is the enzyme alone, PDB entry 5dj5 has a phytohormone bound in the active site, and PDB entry 4iha captures the enzyme after cleavage with part of the phytohormone covalently connected to the serine. To explore these structures in more detail, click on the image for an interactive version.
Topics for Further Discussion
- You can get more information about strigolactone and karrikin on the RCSB ligand pages.
- You always need to be critical of structures in the archive. For example, the ligand in PDB entry 5dj5, shown in the interactive JSmol, has only weak electron density. The "Ligand Structure Quality Assessment" display on the RCSB Structure Summary pages can help you assess the quality of each structure.
- You can compare D14 and KAI2 structures using the Pairwise Structure Alignment Tool. For example, try the alignment of PDB ID 5dj5 and 4jym.
October 2022, David Goodselldoi:10.2210/rcsb_pdb/mom_2022_10