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  1. Article ; Online: Modeling diffuse scattering with simple, physically interpretable models.

    Peck, Ariana / Lane, Thomas J / Poitevin, Frédéric

    Methods in enzymology

    2023  Volume 688, Page(s) 169–194

    Abstract: Diffuse scattering has long been proposed to probe protein dynamics relevant for biological function, and more recently, as a tool to aid structure determination. Despite recent advances in measuring and modeling this signal, the field has not been able ... ...

    Abstract Diffuse scattering has long been proposed to probe protein dynamics relevant for biological function, and more recently, as a tool to aid structure determination. Despite recent advances in measuring and modeling this signal, the field has not been able to routinely use experimental diffuse scattering for either application. A persistent challenge has been to devise models that are sophisticated enough to robustly reproduce experimental diffuse features but remain readily interpretable from the standpoint of structural biology. This chapter presents eryx, a suite of computational tools to evaluate the primary models of disorder that have been used to analyze protein diffuse scattering. By facilitating comparative modeling, eryx aims to provide insights into the physical origins of this signal and help identify the sources of disorder that are critical for reproducing experimental features. This framework also lays the groundwork for the development of more advanced models that integrate different types of disorder without loss of interpretability.
    Language English
    Publishing date 2023-08-01
    Publishing country United States
    Document type Journal Article
    ISSN 1557-7988
    ISSN (online) 1557-7988
    DOI 10.1016/bs.mie.2023.06.022
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Montage electron tomography of vitrified specimens.

    Peck, Ariana / Carter, Stephen D / Mai, Huanghao / Chen, Songye / Burt, Alister / Jensen, Grant J

    Journal of structural biology

    2022  Volume 214, Issue 2, Page(s) 107860

    Abstract: Cryo-electron tomography provides detailed views of macromolecules in situ. However, imaging a large field of view to provide more cellular context requires reducing magnification during data collection, which in turn restricts the resolution. To ... ...

    Abstract Cryo-electron tomography provides detailed views of macromolecules in situ. However, imaging a large field of view to provide more cellular context requires reducing magnification during data collection, which in turn restricts the resolution. To circumvent this trade-off between field of view and resolution, we have developed a montage data collection scheme that uniformly distributes the dose throughout the specimen. In this approach, sets of slightly overlapping circular tiles are collected at high magnification and stitched to form a composite projection image at each tilt angle. These montage tilt-series are then reconstructed into massive tomograms with a small pixel size but a large field of view. For proof-of-principle, we applied this method to the thin edge of HeLa cells. Thon rings to better than 10 Å were detected in the montaged tilt-series, and diverse cellular features were observed in the resulting tomograms. These results indicate that the additional dose required by this technique is not prohibitive to performing structural analysis to intermediate resolution across a large field of view. We anticipate that montage tomography will prove particularly useful for lamellae, increase the likelihood of imaging rare cellular events, and facilitate visual proteomics.
    MeSH term(s) Cryoelectron Microscopy/methods ; Electron Microscope Tomography/methods ; HeLa Cells ; Humans ; Image Processing, Computer-Assisted/methods ; Macromolecular Substances
    Chemical Substances Macromolecular Substances
    Language English
    Publishing date 2022-04-26
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1032718-6
    ISSN 1095-8657 ; 1047-8477
    ISSN (online) 1095-8657
    ISSN 1047-8477
    DOI 10.1016/j.jsb.2022.107860
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Structural basis for functional properties of cytochrome

    Ishigami, Izumi / Sierra, Raymond G / Su, Zhen / Peck, Ariana / Wang, Cong / Poitevin, Frederic / Lisova, Stella / Hayes, Brandon / Moss, Frank R / Boutet, Sébastien / Sublett, Robert E / Yoon, Chun Hong / Yeh, Syun-Ru / Rousseau, Denis L

    bioRxiv : the preprint server for biology

    2023  

    Abstract: ... ...

    Abstract Cytochrome
    Language English
    Publishing date 2023-03-22
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.03.20.530986
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Book ; Online: CryoChains

    Koo, Bongjin / Martel, Julien / Peck, Ariana / Levy, Axel / Poitevin, Frédéric / Miolane, Nina

    Heterogeneous Reconstruction of Molecular Assembly of Semi-flexible Chains from Cryo-EM Images

    2023  

    Abstract: Cryogenic electron microscopy (cryo-EM) has transformed structural biology by allowing to reconstruct 3D biomolecular structures up to near-atomic resolution. However, the 3D reconstruction process remains challenging, as the 3D structures may exhibit ... ...

    Abstract Cryogenic electron microscopy (cryo-EM) has transformed structural biology by allowing to reconstruct 3D biomolecular structures up to near-atomic resolution. However, the 3D reconstruction process remains challenging, as the 3D structures may exhibit substantial shape variations, while the 2D image acquisition suffers from a low signal-to-noise ratio, requiring to acquire very large datasets that are time-consuming to process. Current reconstruction methods are precise but computationally expensive, or faster but lack a physically-plausible model of large molecular shape variations. To fill this gap, we propose CryoChains that encodes large deformations of biomolecules via rigid body transformation of their chains, while representing their finer shape variations with the normal mode analysis framework of biophysics. Our synthetic data experiments on the human GABA\textsubscript{B} and heat shock protein show that CryoChains gives a biophysically-grounded quantification of the heterogeneous conformations of biomolecules, while reconstructing their 3D molecular structures at an improved resolution compared to the current fastest, interpretable deep learning method.
    Keywords Computer Science - Computer Vision and Pattern Recognition ; Quantitative Biology - Biomolecules
    Subject code 612 ; 004
    Publishing date 2023-06-12
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article: Skopi

    Peck, Ariana / Chang, Hsing-Yin / Dujardin, Antoine / Ramalingam, Deeban / Uervirojnangkoorn, Monarin / Wang, Zhaoyou / Mancuso, Adrian / Poitevin, Frédéric / Yoon, Chun Hong

    Journal of applied crystallography

    2022  Volume 55, Issue Pt 4, Page(s) 1002–1010

    Abstract: X-ray free-electron lasers (XFELs) have the ability to produce ultra-bright femtosecond X-ray pulses for coherent diffraction imaging of biomolecules. While the development of methods and algorithms for macromolecular crystallography is now mature, XFEL ... ...

    Abstract X-ray free-electron lasers (XFELs) have the ability to produce ultra-bright femtosecond X-ray pulses for coherent diffraction imaging of biomolecules. While the development of methods and algorithms for macromolecular crystallography is now mature, XFEL experiments involving aerosolized or solvated biomolecular samples offer new challenges in terms of both experimental design and data processing.
    Language English
    Publishing date 2022-07-15
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2020879-0
    ISSN 1600-5767 ; 0021-8898
    ISSN (online) 1600-5767
    ISSN 0021-8898
    DOI 10.1107/S1600576722005994
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: CryoAI: Amortized Inference of Poses for Ab Initio Reconstruction of 3D Molecular Volumes from Real Cryo-EM Images.

    Levy, Axel / Poitevin, Frédéric / Martel, Julien / Nashed, Youssef / Peck, Ariana / Miolane, Nina / Ratner, Daniel / Dunne, Mike / Wetzstein, Gordon

    Computer vision - ECCV ... : ... European Conference on Computer Vision : proceedings. European Conference on Computer Vision

    2022  Volume 13681, Page(s) 540–557

    Abstract: Cryo-electron microscopy (cryo-EM) has become a tool of fundamental importance in structural biology, helping us understand the basic building blocks of life. The algorithmic challenge of cryo-EM is to jointly estimate the unknown 3D poses and the 3D ... ...

    Abstract Cryo-electron microscopy (cryo-EM) has become a tool of fundamental importance in structural biology, helping us understand the basic building blocks of life. The algorithmic challenge of cryo-EM is to jointly estimate the unknown 3D poses and the 3D electron scattering potential of a biomolecule from millions of extremely noisy 2D images. Existing reconstruction algorithms, however, cannot easily keep pace with the rapidly growing size of cryo-EM datasets due to their high computational and memory cost. We introduce cryoAI, an
    Language English
    Publishing date 2022-10-23
    Publishing country Germany
    Document type Journal Article
    DOI 10.1007/978-3-031-19803-8_32
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Structural insights into functional properties of the oxidized form of cytochrome c oxidase.

    Ishigami, Izumi / Sierra, Raymond G / Su, Zhen / Peck, Ariana / Wang, Cong / Poitevin, Frederic / Lisova, Stella / Hayes, Brandon / Moss, Frank R / Boutet, Sébastien / Sublett, Robert E / Yoon, Chun Hong / Yeh, Syun-Ru / Rousseau, Denis L

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 5752

    Abstract: Cytochrome c oxidase (CcO) is an essential enzyme in mitochondrial and bacterial respiration. It catalyzes the four-electron reduction of molecular oxygen to water and harnesses the chemical energy to translocate four protons across biological membranes. ...

    Abstract Cytochrome c oxidase (CcO) is an essential enzyme in mitochondrial and bacterial respiration. It catalyzes the four-electron reduction of molecular oxygen to water and harnesses the chemical energy to translocate four protons across biological membranes. The turnover of the CcO reaction involves an oxidative phase, in which the reduced enzyme (R) is oxidized to the metastable O
    MeSH term(s) Electron Transport Complex IV ; Protons ; Cell Membrane ; Crystallography, X-Ray ; Oxygen
    Chemical Substances Electron Transport Complex IV (EC 1.9.3.1) ; Protons ; Oxygen (S88TT14065)
    Language English
    Publishing date 2023-09-16
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-41533-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Corrigendum: Conformational heterogeneity of the calmodulin binding interface.

    Shukla, Diwakar / Peck, Ariana / Pande, Vijay S

    Nature communications

    2016  Volume 7, Page(s) 12318

    Keywords covid19
    Language English
    Publishing date 2016--10
    Publishing country England
    Document type Journal Article ; Published Erratum
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms12318
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Intermolecular correlations are necessary to explain diffuse scattering from protein crystals.

    Peck, Ariana / Poitevin, Frédéric / Lane, Thomas J

    IUCrJ

    2018  Volume 5, Issue Pt 2, Page(s) 211–222

    Abstract: Conformational changes drive protein function, including catalysis, allostery and signaling. X-ray diffuse scattering from protein crystals has frequently been cited as a probe of these correlated motions, with significant potential to advance our ... ...

    Abstract Conformational changes drive protein function, including catalysis, allostery and signaling. X-ray diffuse scattering from protein crystals has frequently been cited as a probe of these correlated motions, with significant potential to advance our understanding of biological dynamics. However, recent work has challenged this prevailing view, suggesting instead that diffuse scattering primarily originates from rigid-body motions and could therefore be applied to improve structure determination. To investigate the nature of the disorder giving rise to diffuse scattering, and thus the potential applications of this signal, a diverse repertoire of disorder models was assessed for its ability to reproduce the diffuse signal reconstructed from three protein crystals. This comparison revealed that multiple models of intramolecular conformational dynamics, including ensemble models inferred from the Bragg data, could not explain the signal. Models of rigid-body or short-range liquid-like motions, in which dynamics are confined to the biological unit, showed modest agreement with the diffuse maps, but were unable to reproduce experimental features indicative of long-range correlations. Extending a model of liquid-like motions to include disorder across neighboring proteins in the crystal significantly improved agreement with all three systems and highlighted the contribution of intermolecular correlations to the observed signal. These findings anticipate a need to account for intermolecular disorder in order to advance the interpretation of diffuse scattering to either extract biological motions or aid structural inference.
    Language English
    Publishing date 2018-02-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 2754953-7
    ISSN 2052-2525
    ISSN 2052-2525
    DOI 10.1107/S2052252518001124
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Intermolecular correlations are necessary to explain diffuse scattering from protein crystals

    Ariana Peck / Frédéric Poitevin / Thomas J. Lane

    IUCrJ, Vol 5, Iss 2, Pp 211-

    2018  Volume 222

    Abstract: Conformational changes drive protein function, including catalysis, allostery and signaling. X-ray diffuse scattering from protein crystals has frequently been cited as a probe of these correlated motions, with significant potential to advance our ... ...

    Abstract Conformational changes drive protein function, including catalysis, allostery and signaling. X-ray diffuse scattering from protein crystals has frequently been cited as a probe of these correlated motions, with significant potential to advance our understanding of biological dynamics. However, recent work has challenged this prevailing view, suggesting instead that diffuse scattering primarily originates from rigid-body motions and could therefore be applied to improve structure determination. To investigate the nature of the disorder giving rise to diffuse scattering, and thus the potential applications of this signal, a diverse repertoire of disorder models was assessed for its ability to reproduce the diffuse signal reconstructed from three protein crystals. This comparison revealed that multiple models of intramolecular conformational dynamics, including ensemble models inferred from the Bragg data, could not explain the signal. Models of rigid-body or short-range liquid-like motions, in which dynamics are confined to the biological unit, showed modest agreement with the diffuse maps, but were unable to reproduce experimental features indicative of long-range correlations. Extending a model of liquid-like motions to include disorder across neighboring proteins in the crystal significantly improved agreement with all three systems and highlighted the contribution of intermolecular correlations to the observed signal. These findings anticipate a need to account for intermolecular disorder in order to advance the interpretation of diffuse scattering to either extract biological motions or aid structural inference.
    Keywords diffuse scattering ; intermolecular correlations ; Science ; Q
    Subject code 612
    Language English
    Publishing date 2018-03-01T00:00:00Z
    Publisher International Union of Crystallography
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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