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The elusive ligand complexes of the DWARF14 strigolactone receptor
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics.ORCID iD: 0000-0002-7565-0177
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular biophysics.ORCID iD: 0000-0001-8710-327x
Univ Turin, Dept Agr Forestry & Food Sci, Largo Paolo Braccini 2, I-10095 Grugliasco 2, Italy.ORCID iD: 0000-0001-9892-9325
Univ Turin, Dept Chem, Via P Giuria 7, I-10125 Turin, Italy.ORCID iD: 0000-0001-9510-8783
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2018 (English)In: Journal of Experimental Botany, ISSN 0022-0957, E-ISSN 1460-2431, Vol. 69, no 9, p. 2345-2354Article in journal (Refereed) Published
Abstract [en]

Strigolactones, a group of terpenoid lactones, control many aspects of plant growth and development, but the active forms of these plant hormones and their mode of action at the molecular level are still unknown. The strigolactone protein receptor is unusual because it has been shown to cleave the hormone and supposedly forms a covalent bond with the cleaved hormone fragment. This interaction is suggested to induce a conformational change in the receptor that primes it for subsequent interaction with partners in the signalling pathway. Substantial efforts have been invested into describing the interaction of synthetic strigolactone analogues with the receptor, resulting in a number of crystal structures. This investigation combines a re-evaluation of models in the Protein Data Bank with a search for new conditions that may permit the capture of a receptor-ligand complex. While weak difference density is frequently observed in the binding cavity, possibly due to a low-occupancy compound, the models often contain features not supported by the X-ray data. Thus, at this stage, we do not believe that any detailed deductions about the nature, conformation, or binding mode of the ligand can be made with any confidence.

Place, publisher, year, edition, pages
2018. Vol. 69, no 9, p. 2345-2354
Keywords [en]
Crystal structure, DWARF14, ligand binding, Oryza sativa, strigolactone, strigolactone receptor
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:uu:diva-354969DOI: 10.1093/jxb/ery036ISI: 000430727000014PubMedID: 29394369OAI: oai:DiVA.org:uu-354969DiVA, id: diva2:1223233
Available from: 2018-06-25 Created: 2018-06-25 Last updated: 2018-06-25Bibliographically approved

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