5IYX
Crystal structure of the Arabidopsis receptor kinase HAESA in complex with the peptide hormone IDA and the co-receptor SERK1
Summary for 5IYX
| Entry DOI | 10.2210/pdb5iyx/pdb |
| Descriptor | Receptor-like protein kinase 5, Protein IDA, Somatic embryogenesis receptor kinase 1, ... (7 entities in total) |
| Functional Keywords | membrane receptor kinase, peptide hormone receptor, signaling complex, plant development, organ shedding, signaling protein |
| Biological source | Arabidopsis thaliana (Mouse-ear cress) More |
| Cellular location | Cell membrane ; Single-pass type I membrane protein : P47735 Q94AG2 Secreted, extracellular space : Q8LAD7 |
| Total number of polymer chains | 3 |
| Total formula weight | 97715.76 |
| Authors | Santiago, J.,Hothorn, M. (deposition date: 2016-03-24, release date: 2016-04-20, Last modification date: 2024-01-10) |
| Primary citation | Santiago, J.,Brandt, B.,Wildhagen, M.,Hohmann, U.,Hothorn, L.A.,Butenko, M.A.,Hothorn, M. Mechanistic insight into a peptide hormone signaling complex mediating floral organ abscission. Elife, 5:-, 2016 Cited by PubMed Abstract: Plants constantly renew during their life cycle and thus require to shed senescent and damaged organs. Floral abscission is controlled by the leucine-rich repeat receptor kinase (LRR-RK) HAESA and the peptide hormone IDA. It is unknown how expression of IDA in the abscission zone leads to HAESA activation. Here we show that IDA is sensed directly by the HAESA ectodomain. Crystal structures of HAESA in complex with IDA reveal a hormone binding pocket that accommodates an active dodecamer peptide. A central hydroxyproline residue anchors IDA to the receptor. The HAESA co-receptor SERK1, a positive regulator of the floral abscission pathway, allows for high-affinity sensing of the peptide hormone by binding to an Arg-His-Asn motif in IDA. This sequence pattern is conserved among diverse plant peptides, suggesting that plant peptide hormone receptors may share a common ligand binding mode and activation mechanism. PubMed: 27058169DOI: 10.7554/eLife.15075 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.43 Å) |
Structure validation
Download full validation report
