New X-ray crystallography and cryo-electron microscopy (cryo-EM) approaches yield vast amounts of structural data from dynamic proteins and their complexes. Modeling the full conformational ensemble can provide important biological insights, but identifying and modeling an internally consistent set of alternate conformations remains a formidable challenge. qFit efficiently automates this process by generating a parsimonious multiconformer model. We refactored qFit from a distributed application into software that runs efficiently on a small server, desktop, or laptop. We describe the new qFit 3 software and provide some examples. qFit 3 is open-source under the MIT license, and is available at https://github.com/ExcitedStates/qfit-3.0.
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http://dx.doi.org/10.1002/pro.4001 | DOI Listing |
bioRxiv
September 2024
Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA.
Small molecule ligands exhibit a diverse range of conformations in solution. Upon binding to a target protein, this conformational diversity is generally reduced. However, ligands can retain some degree of conformational flexibility even when bound to a receptor.
View Article and Find Full Text PDFScott Med J
August 2024
Department of Colorectal Disease, Victoria Hospital Kirkcaldy, Kirkcaldy, UK.
Objectives: Pressured healthcare resources make risk stratification and patient prioritisation fundamental issues for the investigation of colorectal cancer (CRC) in symptomatic patients. The present study uses machine learning algorithms and decision strategies to improve the appropriate use of colonoscopy.
Design: All symptomatic patients in a single health board (2018-2021) proceeding to colonoscopy to investigate for CRC were included.
Elife
June 2024
Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, United States.
In their folded state, biomolecules exchange between multiple conformational states that are crucial for their function. Traditional structural biology methods, such as X-ray crystallography and cryogenic electron microscopy (cryo-EM), produce density maps that are ensemble averages, reflecting molecules in various conformations. Yet, most models derived from these maps explicitly represent only a single conformation, overlooking the complexity of biomolecular structures.
View Article and Find Full Text PDFPharmaceuticals (Basel)
November 2023
Laboratory of Molecular Modeling, Department of Health, State University of Feira de Santana, Feira de Santana 44036-900, BA, Brazil.
Alzheimer's disease (AD) is a neurodegenerative disease characterized by progressive loss of cognitive functions, and it is the most prevalent type of dementia worldwide, accounting for 60 to 70% of cases. The pathogenesis of AD seems to involve three main factors: deficiency in cholinergic transmission, formation of extracellular deposits of β-amyloid peptide, and accumulation of deposits of a phosphorylated form of the TAU protein. The currently available drugs are prescribed for symptomatic treatment and present adverse effects such as hepatotoxicity, hypertension, and weight loss.
View Article and Find Full Text PDFBJGP Open
December 2023
Dunluce Health Centre, Belfast, Northern Ireland, UK.
Background: The incidence of early-onset colorectal cancer (EOCRC) in adults aged <50 years has increased in several Western nations. National surveys have highlighted significant barriers to accessing timely care for patients with EOCRC, which may be contributing to a late stage of presentation in this population group.
Aim: To explore awareness of the increasing incidence of EOCRC, and to understand the potential barriers or facilitators faced by GPs when referring younger adults to secondary care with features indicative of EOCRC.
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