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Book
Viral Interactions with the Nucleus
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Year: 2017 Publisher: Frontiers Media SA

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Abstract

Viruses cause numerous medically important diseases, affecting developing, developed, rich and poor alike. The diseases vary in severity, including chickenpox, smallpox, influenza, shingles, herpes, rabies, polio, Ebola, hanta fever, AIDS and the common cold, amongst others. Regardless of the type of tissue or organ affected, all viruses follow the same basic steps to infect host cells. Once in contact with host cells viruses release their genetic material into the cell followed by genome replication, production of viral proteins, assembly of the virus particle and egress from the infected cell. Viruses disrupt normal host cell processes in order to facilitate their own replication/assembly by re-directing cellular machinery for viral transcription, translation, assembly, release and by inhibiting antiviral responses. Regulated nuclear transport of macromolecules through the nuclear pore complex, the only means of transport across the nuclear membrane, is essential for normal cell function and an effective antiviral response. Many viruses disrupt or exploit the nucleocytoplasmic trafficking pathways in host cells. Cytoplasmic viruses exploit the host cell nucleocytoplasmic trafficking machinery to access nuclear functions and/or disrupt nuclear transport, while several DNA viruses use the trafficking pathways to enable export of their components into the cytoplasm; yet others complete their assembly within the nucleus and use nuclear export pathways to access the cytoplasm. Indeed, the many and varied interactions of viruses and viral proteins with nucleocytoplasmic trafficking components have been invaluable in pathway discovery. Importantly, mounting evidence suggests that these interactions play essential roles in virus replication/assembly and hence may be key to understanding pathophysiology of viral diseases. This Frontiers Research Topic is dedicated to the importance of nucleocytoplasmic trafficking to viral pathogenesis.


Book
Functionally Relevant Macromolecular Interactions of Disordered Proteins
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Year: 2020 Publisher: Basel, Switzerland MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Disordered proteins are relatively recent newcomers in protein science. They were first described in detail by Wright and Dyson, in their J. Mol. Biol. paper in 1999. First, it was generally thought for more than a decade that disordered proteins or disordered parts of proteins have different amino acid compositions than folded proteins, and various prediction methods were developed based on this principle. These methods were suitable for distinguishing between the disordered (unstructured) and structured proteins known at that time. In addition, they could predict the site where a folded protein binds to the disordered part of a protein, shaping the latter into a well-defined 3D structure. Recently, however, evidence has emerged for a new type of disordered protein family whose members can undergo coupled folding and binding without the involvement of any folded proteins. Instead, they interact with each other, stabilizing their structure via “mutual synergistic folding” and, surprisingly, they exhibit the same residue composition as the folded protein. Increasingly more examples have been found where disordered proteins interact with non-protein macromolecules, adding to the already large variety of protein–protein interactions. There is also a very new phenomenon when proteins are involved in phase separation, which can represent a weak but functionally important macromolecular interaction. These phenomena are presented and discussed in the chapters of this book.

Keywords

Research & information: general --- Biology, life sciences --- intrinsically disordered proteins --- epiproteome --- disordered protein platform --- molecular recognition feature --- post-translational modifications --- physiological homeostasis --- stress response --- RIN4 --- p53 --- molecular machines --- intrinsically disordered protein --- membrane-less organelle --- neurodegenerative disease --- p300 HAT acetylation --- post-translational modification --- protein aggregation --- Tau fibrillation --- intrinsically disorder proteins --- disorder-to-order regions --- protein–RNA interactions --- unstructured proteins --- conformational plasticity --- disordered protein --- folding --- ribosomal protein --- spectroscopy --- protein stability --- temperature response --- protein thermostability --- salt bridges --- meta strategy --- dual threshold --- significance voting --- decision tree based artificial neural network --- protein intrinsic disorder --- intrinsic disorder --- intrinsic disorder prediction --- intrinsically disordered region --- protein conformation --- transcriptome --- RNA sequencing --- Microarray --- differentially regulated genes --- gene ontology analysis --- functional analysis --- intrinsically disordered --- structural disorder --- correlated mutations --- co-evolution --- evolutionary couplings --- residue co-variation --- interaction surface --- residue contact network --- dehydron --- homodimer --- hydrogen bond --- inter-subunit interaction --- ion pair --- mutual synergistic folding --- solvent-accessible surface area --- stabilization center --- MLL proteins --- MLL4 --- lncRNA --- HOTAIR --- MEG3 --- leukemia --- histone lysine methyltransferase --- RNA binding --- protein --- hydration --- wide-line 1H NMR --- secretion --- immune --- extracellular --- protein-protein interaction --- structural domain --- evolution --- transcription factors --- DNA-protein interactions --- Sox2 sequential DNA loading --- smFRET --- DNA conformational landscape --- sequential DNA bending --- transcription factor dosage --- oligomer --- N-terminal prion protein --- copper binding --- prion disease mutations --- Nuclear pore complex --- FG-Nups --- phosphorylation --- coarse-grained --- CABS model --- MC simulations --- statistical force fields --- protein structure --- intrinsically disordered proteins (IDPs) --- neurodegenerative diseases --- aggregation --- drugs --- drug discovery --- plant virus --- eIF4E --- VPg --- potyvirus --- molten globule --- fluorescence anisotropy --- protein hydrodynamics

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