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Crystal structure of yellow lupin LLPR-10.2B protein in complex with melatonin and trans-zeatin.
Structural highlights
FunctionP102B_LUPLU Class II ribonuclease (RNase) (By similarity). Binds to several cytokinins including natural adenine-type (e.g. trans-zeatin and kinetin) and artificial urea-type (e.g. N,N'-diphenylurea and N-phenyl-N'-(2-chloro-4-pyridyl)urea) hormones (PubMed:18406424, PubMed:19220853, PubMed:29630775). Interacts with melatonin (PubMed:29630775).[UniProtKB:P52779][1] [2] [3] Publication Abstract from PubMedLlPR-10.2B, a Pathogenesis-Related class 10 (PR-10) protein from yellow lupine (Lupinus luteus) was crystallized in complex with melatonin, an emerging important plant regulator and antioxidant. The structure reveals two molecules of melatonin bound in the internal cavity of the protein, plus a very well defined electron density near the cavity entrance, corresponding to an unknown ligand molecule comprised of two flat rings, which is most likely a product of melatonin transformation. In a separate LlPR-10.2B co-crystallization experiment with an equimolar mixture of melatonin and trans-zeatin, which is a cytokinin phytohormone well recognized as a PR-10 binding partner, a quaternary 1:1:1:1 complex was formed, in which one of the melatonin binding sites has been substituted with trans-zeatin, whereas the binding of melatonin at the second binding site and binding of the unknown ligand are undisturbed. This unusual complex, when compared with the previously described PR-10/trans-zeatin complexes and with the emerging structural information about melatonin binding by PR-10 proteins, provides intriguing insights into the role of PR-10 proteins in phytohormone regulation in plants, especially with the involvement of melatonin, and implicates the PR-10 proteins as low-affinity melatonin binders under the conditions of elevated melatonin concentration. This article is protected by copyright. All rights reserved. PR-10 proteins as potential mediators of melatonin-cytokinin cross-talk in plants: crystallographic studies of LlPR-10.2B isoform from yellow lupine.,Sliwiak J, Sikorski M, Jaskolski M FEBS J. 2018 Apr 6. doi: 10.1111/febs.14455. PMID:29630775[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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