Artocarpus altilis CG-901 alters critical nodes in the JH1-kinase domain of Janus kinase 2 affecting upstream JAK/STAT3 signaling

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Title
Artocarpus altilis CG-901 alters critical nodes in the JH1-kinase domain of Janus kinase 2 affecting upstream JAK/STAT3 signaling
Author(s)
O Nash; O Omotuyi; J Lee; Byoung-Mog Kwon; L Ogbadu
Bibliographic Citation
Journal of Molecular Modeling, vol. 21, no. 11, pp. 280-280
Publication Year
2015
Abstract
As a key step in achieving low-cost, easily accessible anti-cancer therapy for low- and middle-income countries, we recently established the scientific basis for the folkloric use of Artocarpus altilis for the treatment of cancer by investigating the geranyl dihydrochalcone (CG-901) content and its interference with signal transducer and activator of transcription 3 (STAT3) phosphorylation and blockage of further downstream signaling. In the current study, the CG-901 upstream target was queried by chemical fingerprinting similarity assessment, semi-empirical (PM6ESCF) QMMM and molecular dynamics (MD) simulation. Moderate (∼0.4) to high (∼0.7) Tanimoto scores were found when the CG-901 scaffold was compared to ligands co-crystallized with Janus kinases (JAK) 1?3. High negative energy values were obtained when the CG-901 was treated semi-empirically (PM6ESCF) within the classical field of JAK (1?3). Multiple nanosecond MD simulations showed that CG-901 did not cause any large structural perturbations in the nucleotide-binding, activation and catalytic loops within the kinase (JH1) domain of JAK (1?3); however, it reduced the energy required to attain metastability along the path to energy minima conformation. In comparison to JAK1 and Apo-state JAK2, JAK2-bound CG-901 exhibited a highly re-organized key intra-domain protein network; indicating atomic level interference with inter-residue communication. In conclusion, CG-901 isolated from A. altilis represents a broad-spectrum JAK inhibitor, which may underlie the mechanism of STAT3 phosphorylation blockage. [Figure not available: see fulltext.]
Keyword
AnticancerArtocarpus altilisCritical nodesGeranyl dihydrochalconeJanus kinaseSTAT3
ISSN
1610-2940
Publisher
Springer
DOI
http://dx.doi.org/10.1007/s00894-015-2821-z
Type
Article
Appears in Collections:
Division of Biomedical Research > Genome Editing Research Center > 1. Journal Articles
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