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Structure, function and regulation of the hsp90 machinery
Heat shock protein 90 (Hsp90) is an ATP-dependent molecular chaperone which is essential in eukaryotes. It is required for the activation and stabilization of a wide variety of client proteins and many of them are involved in important cellular pathways. Since Hsp90 affects numerous physiological processes such as signal transduction, intracellular transport, and protein degradation, it became an interesting target for cancer therapy. Structurally, Hsp90 is a flexible dimeric protein composed of three different domains which adopt structurally distinct conformations. ATP binding triggers directionality in these conformational changes and leads to a more compact state. To achieve its function, Hsp90 works together with a large group of cofactors, termed co-chaperones. Co-chaperones form defined binary or ternary complexes with Hsp90, which facilitate the maturation of client proteins. In addition, posttranslational modifications of Hsp90, such as phosphorylation and acetylation, provide another level of regulation. They influence the conformational cycle, co-chaperone interaction, and inter-domain communications. In this review, we discuss the recent progress made in understanding the Hsp90 machinery.
Journal Article
Toxic Town
p strongShows the risks of high-tech pollution through a study of an IBM plant's effects on a New York town/strong In 1924, IBM built its first plant in Endicott, New York. Now, Endicott is a contested toxic waste site. With its landscape thoroughly contaminated by carcinogens, Endicott is the subject of one of the nation's largest corporate-state mitigation efforts. Yet despite the efforts of IBM and the U.S. government, Endicott residents remain skeptical that the mitigation systems employed were designed with their best interests at heart. In emToxic Town/em, Peter C. Little tracks and critically diagnoses the experiences of Endicott residents as they learn to live with high-tech pollution, community transformation, scientific expertise, corporate-state power, and risk mitigation technologies. By weaving together the insights of anthropology, political ecology, disaster studies, and science and technology studies, the book explores questions of theoretical and practical import for understanding the politics of risk and the ironies of technological disaster response in a time when IBM's stated mission is to build a \"Smarter Planet.\" Little critically reflects on IBM's new corporate tagline, arguing for a political ecology of corporate social and environmental responsibility and accountability that places the social and environmental politics of risk mitigation front and center. Ultimately, Little argues that we will need much more than hollow corporate taglines, claims of corporate responsibility, and attempts to mitigate high-tech disasters to truly build a smarter planet./p
eBook
Salt production and social hierarchy in ancient China : an archaeological investigation of specialization in China's Three Gorges
\"This book examines the organization of specialized salt production at Zhongba, one of the most important prehistoric sites in the Three Gorges of China's Yangzi River valley\"-- Provided by publisher.
Book
Lahav IV: The Figurines of Tell Halif
This volume appears as the fourth in a series of reports on the investigations of the Lahav Research Project (LRP) at Tell Halif, located near Kibbutz Lahav in southern Israel. The book and CD, also titled The Figurines of Tell Halif, contain the publication of the terra-cotta and stone figurine assemblage discovered in the Phase III excavations by LRP. The book presents the text of the report, including relevant archaeological contexts, while the CD is the primary source for detailed information about the figurines. It presents color photographs of each artifact, as well as artist's drawings and QuickTime movies, along with descriptions and a working typology of the mixed Iron II, Persian, and Hellenistic period terra-cottas. Together, book and CD offer the entire corpus of 794 figurine and statue fragments and provide an invaluable addition to the corpus of Levantine figurines.
eBook
Tikal : paleoecology of an ancient Maya city
\"This book focuses on how the ancient Maya in the northern Petâen Basin were able to sustain large populations during the Late Classic period.\"-- Provided by publisher.
Book
Ligandability Assessment of Human Glutathione Transferase M1-1 Using Pesticides as Chemical Probes
Glutathione transferases (GSTs; EC 2.5.1.18) form a group of multifunctional enzymes that are involved in phase II of the cellular detoxification mechanism and are associated with increased susceptibility to cancer development and resistance to anticancer drugs. The present study aims to evaluate the ligandability of the human GSTM1-1 isoenzyme (hGSTM1-1) using a broad range of structurally diverse pesticides as probes. The results revealed that hGSTM1-1, compared to other classes of GSTs, displays limited ligandability and ligand-binding promiscuity, as revealed by kinetic inhibition studies. Among all tested pesticides, the carbamate insecticide pirimicarb was identified as the strongest inhibitor towards hGSTM1-1. Kinetic inhibition analysis showed that pirimicarb behaved as a mixed-type inhibitor toward glutathione (GSH) and 1-chloro-2,4-dinitrobenzene (CDNB). To shine a light on the restricted hGSTM1-1 ligand-binding promiscuity, the ligand-free crystal structure of hGSTM1-1 was determined by X-ray crystallography at 1.59 Å-resolution. Comparative analysis of ligand-free structure with the available ligand-bound structures allowed for the study of the enzyme’s plasticity and the induced-fit mechanism operated by hGSTM1-1. The results revealed important structural features of the H-site that contribute to xenobiotic-ligand binding and specificity. It was concluded that hGSTM1-1 interacts preferentially with one-ring aromatic compounds that bind at a discrete site which partially overlaps with the xenobiotic substrate binding site (H-site). The results of the study form a basis for the rational design of new drugs targeting hGSTM1-1.
Journal Article
Activation pathway of a G protein-coupled receptor uncovers conformational intermediates as targets for allosteric drug design
G protein-coupled receptors (GPCRs) are the most common proteins targeted by approved drugs. A complete mechanistic elucidation of large-scale conformational transitions underlying the activation mechanisms of GPCRs is of critical importance for therapeutic drug development. Here, we apply a combined computational and experimental framework integrating extensive molecular dynamics simulations, Markov state models, site-directed mutagenesis, and conformational biosensors to investigate the conformational landscape of the angiotensin II (AngII) type 1 receptor (AT
1
receptor) — a prototypical class A GPCR—activation. Our findings suggest a synergistic transition mechanism for AT
1
receptor activation. A key intermediate state is identified in the activation pathway, which possesses a cryptic binding site within the intracellular region of the receptor. Mutation of this cryptic site prevents activation of the downstream G protein signaling and β-arrestin-mediated pathways by the endogenous AngII octapeptide agonist, suggesting an allosteric regulatory mechanism. Together, these findings provide a deeper understanding of AT
1
receptor activation at an atomic level and suggest avenues for the design of allosteric AT
1
receptor modulators with a broad range of applications in GPCR biology, biophysics, and medicinal chemistry.
G protein-coupled receptors (GPCRs) are a critical target in modern drug development across a wide range of indications. Here the authors provide a comprehensive characterization of a typical GPCR, the angiotensin II (AngII) type 1 receptor (AT1R), and provide insight into its activation mechanism that suggest avenues for the design of allosteric GPCR modulators.
Journal Article