6,6-dihydroxythiobinupharidine (Dtbn) purified from nuphar lutea leaves is an inhibitor of protein kinase c catalytic activity

Kamran Waidha, Nikhil Ponnoor Anto, Divya Ram Jayaram, Avi Golan-Goldhirsh, Saravanakumar Rajendran, Etta Livneh, Jacob Gopas

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Water lily (Nuphar) bioactive extracts have been widely used in traditional medicine owing to their multiple applications against human ailments. Phyto-active Nuphar extracts and their purified and synthetic derivatives have attracted the attention of ethnobotanists and biochemists. Here, we report that 6,6-dihydroxythiobinupharidine (DTBN), purified from extracts of Nuphar lutea (L.) Sm. leaves, is an effective inhibitor of the kinase activity of members of the protein kinase C (PKC) family using in vitro and in silico approaches. We demonstrate that members of the conventional subfamily of PKCs, PKCα and PKCγ, were more sensitive to DTBN inhibition as compared to novel or atypical PKCs. Molecular docking analysis demonstrated the interaction of DTBN, with the kinase domain of PKCs depicting the best affinity towards conventional PKCs, in accordance with our in vitro kinase activity data. The current study reveals novel targets for DTBN activity, functioning as an inhibitor for PKCs kinase activity. Thus, this and other data indicate that DTBN modulates key cellular signal transduction pathways relevant to disease biology, including cancer.

Original languageEnglish
Article number2785
Issue number9
StatePublished - 1 Jan 2021


  • 6,6-dihydroxythiobinupharidine (DTBN)
  • Homology docking modeling
  • Kinase inhibitor
  • Nuphar lutea
  • Protein kinase C (PKC)
  • Ramachandran plot

ASJC Scopus subject areas

  • Analytical Chemistry
  • Chemistry (miscellaneous)
  • Molecular Medicine
  • Pharmaceutical Science
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry


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