Perspective
|
Open Access
Featured
-
-
Article
| Open AccessStructural insights into the DNA topoisomerase II of the African swine fever virus
African swine fever virus is the sole mammalian-infecting virus encoding a type II topoisomerases (pP1192R). The authors present pP1192R structures in different states, illustrating the enzymatic mechanisms of viral type II topoisomerases.
- Jingyuan Cong
- , Yuhui Xin
- & Yutao Chen
-
Article
| Open AccessStructures of the mumps virus polymerase complex via cryo-electron microscopy
The viral polymerase complex is crucial for both genome replication and transcription in non-segmented negative-strand RNA viruses. Here, the authors link varying structures of polymerase complexes with their dual functions and propose a sliding model for them to advance along the RNA templates.
- Tianhao Li
- , Mingdong Liu
- & Qing-Tao Shen
-
Article
| Open AccessStructural basis for dimerization of a paramyxovirus polymerase complex
The structure and function of polymerase dimers of non-segmented, negative-strand RNA viruses are poorly understood. Here, this study presents the structural basis for dimerization of a paramyxovirus L–P polymerase and its role in genome replication.
- Jin Xie
- , Mohamed Ouizougun-Oubari
- & Shuai Chen
-
Article
| Open AccessStructure of the intact tail machine of Anabaena myophage A-1(L)
The Myoviridae cyanophage A-1(L) specifically infects the model cyanobacteria Anabaena sp. PCC 7120. Here, authors present the high-resolution cryo-EM structure of its intact tail machine, and identify multiple hydrolytic and binding modules.
- Rong-Cheng Yu
- , Feng Yang
- & Cong-Zhao Zhou
-
Article
| Open AccessStructure of orthoreovirus RNA chaperone σNS, a component of viral replication factories
Orthoreovirus σNS, essential for forming viral replication factories, has RNA chaperone activity that requires the association of σNS dimers into filamentous structures stabilized by domain-swapping interactions of the flexible N-terminal arms.
- Boyang Zhao
- , Liya Hu
- & B. V. Venkataram Prasad
-
Article
| Open AccessCryo-EM structures of Banna virus in multiple states reveal stepwise detachment of viral spikes
Here, Li et al. provide the cryo-EM structures of Banna virus (BAV) in four configurations. VP10 functions as a unique cementing protein to stabilize the capsid shells and spikes in the full particles and during cell entry. Structural transition from BAV virions to cores is a stepwise process of dissociation of receptor binding protein VP9 and membrane penetration protein VP4.
- Zhiqiang Li
- , Han Xia
- & Sheng Cao
-
Article
| Open AccessStructure of the N-RNA/P interface indicates mode of L/P recruitment to the nucleocapsid of human metapneumovirus
To read and transcribe the viral genome, the polymerase complex of human metapneumovirus (HMPV) needs to attach to the nucleocapsid. Here, the authors define the dynamic basis of how the polymerase cofactor P facilitates this attachment.
- Jack D. Whitehead
- , Hortense Decool
- & Max Renner
-
Article
| Open AccessArchitecture of the baculovirus nucleocapsid revealed by cryo-EM
Baculovirus Autographa californica multiple nucleopolyhedrovirus (AcMNPV) is used as a bioinsecticide and a protein expression vector. Here, the authors report structures of cylindrical body of the AcMNPV nucleocapsid, as well as of both the nucleocapsid head and base.
- Xudong Jia
- , Yuanzhu Gao
- & Qinfen Zhang
-
Article
| Open AccessCryo-EM structure of cyanophage P-SCSP1u offers insights into DNA gating and evolution of T7-like viruses
Here the authors unveil the assembly of a cyanophage in its native form, providing insights into DNA gating and infection process of tailed phages. They proposed structure-based analysis for virus evolution and classification.
- Lanlan Cai
- , Hang Liu
- & Shangyu Dang
-
Article
| Open AccessCryo-EM structure of severe fever with thrombocytopenia syndrome virus
The severe fever with thrombocytopenia syndrome virus (SFTSV, officially named Dabie bandavirus) is a tick-borne human-infecting bunyavirus. Here, the authors report the cryo-EM structure of SFTSV virion, and discuss the mechanisms of viral assembly, membrane fusion and antibody neutralization.
- Shouwen Du
- , Ruchao Peng
- & Chang Li
-
Article
| Open AccessOrganisation of the orthobunyavirus tripodal spike and the structural changes induced by low pH and K+ during entry
Enveloped viruses employ the maturing environment of endosomes to promote endosomal escape. Here, authors generate a pseudo-atomic model of the BUNV envelope using sub-tomogram averaging and AlphaFold, and identify ionic cues for fusion events.
- Samantha Hover
- , Frank W. Charlton
- & Juan Fontana
-
Article
| Open AccessStructural landscape of the respiratory syncytial virus nucleocapsids
The authors explore the structural polymorphism of the Human Respiratory Syncytial Virus (HRSV) nucleocapsids, detect a non-canonical symmetry of the helical state resulting in variations in the genome accessibility, and reveal its molecular determinant.
- Lorène Gonnin
- , Ambroise Desfosses
- & Irina Gutsche
-
Article
| Open AccessMultidisciplinary studies with mutated HIV-1 capsid proteins reveal structural mechanisms of lattice stabilization
The effects of E45A or P38A capsid mutations on HIV core stability and infectivity are reversed by R132T or T216I. Here, authors used structural and biophysical methods to reveal short- and long-range rearrangements that explain stability changes.
- Anna T. Gres
- , Karen A. Kirby
- & Stefan G. Sarafianos
-
Article
| Open AccessStructure and proposed DNA delivery mechanism of a marine roseophage
Tailed bacteriophages account for the majority of all phages. Here, the authors employ cryo-EM and structure prediction techniques to investigate the atomic structure of the R4C phage capsid and the in- situ structure of its unique long rigid tail.
- Yang Huang
- , Hui Sun
- & Ningshao Xia
-
Article
| Open AccessStructure and antigenicity of divergent Henipavirus fusion glycoproteins
In 2022, the zoonotic Langya virus caused cases of severe pneumonia in humans. Here, the authors determine the structure of the fusion glycoprotein of Langya virus and demonstrate antigenic but not structural divergence from bat-borne henipaviruses, yielding insights for future vaccine designs.
- Ariel Isaacs
- , Yu Shang Low
- & Daniel Watterson
-
Article
| Open AccessBipartite genome and structural organization of the parvovirus Acheta domesticus segmented densovirus
Parvoviruses have been reported to carry a linear monopartite ssDNA genome. In this study, the authors isolated an insect-infecting parvovirus with a bipartite genome from house crickets and discovered a genome packaging strategy distinct from other parvoviruses.
- Judit J. Pénzes
- , Hanh T. Pham
- & Peter Tijssen
-
Article
| Open AccessDesign of bacteriophage T4-based artificial viral vectors for human genome remodeling
Safe delivery of genes is needed for gene therapy. Here the authors build “artificial viral vectors” (AVVs) by engineering the well-characterised structural components of bacteriophage T4: the large capacity, all-in-one, multiplex, programmable, and phage-based AVV nanomaterials have potential for gene therapy.
- Jingen Zhu
- , Himanshu Batra
- & Venigalla B. Rao
-
Article
| Open AccessNear-atomic architecture of Singapore grouper iridovirus and implications for giant virus assembly
High morbidity and mortality in aquatic have been caused by iridovirids worldwide. Here the authors present a near-atomic SGIV capsid structure. Functional assays further reveal the relationships between identified capsid proteins and viral assembly.
- Zhennan Zhao
- , Youhua Huang
- & George F. Gao
-
Article
| Open AccessCrystal structure of a highly conserved enteroviral 5′ cloverleaf RNA replication element
A cloverleaf-like RNA domain within the enterovirus genome is essential for replication. Here, the authors determine the 1.9 Å resolution crystal structure of such RNA from coxsackievirus B3 – a model enterovirus to study many other human viruses.
- Naba K. Das
- , Nele M. Hollmann
- & Deepak Koirala
-
Article
| Open AccessStructure of the Newcastle Disease Virus L protein in complex with tetrameric phosphoprotein
Newcastle disease virus (NDV) belongs to Paramyxoviridae and encodes a large protein (L) and phosphoprotein (P) for viral RNA synthesis. Here the authors present cryo-EM structures of the L-P complex, and propose a model of how RNA initiation/elongation alternates during viral RNA synthesis.
- Jingyuan Cong
- , Xiaoying Feng
- & Zihe Rao
-
Article
| Open AccessStructural basis of HIV-1 maturation inhibitor binding and activity
HIV maturation inhibitors such as bevirimat (BVM) interfering with Gag processing are emerging as alternative anti-retroviral drug candidates. Here, the authors report structures of assemblies of HIV-1 Gag fragments spanning the CA C-terminal domain and SP1 region bound to BVM.
- Sucharita Sarkar
- , Kaneil K. Zadrozny
- & Tatyana Polenova
-
Article
| Open AccessStructures of honeybee-infecting Lake Sinai virus reveal domain functions and capsid assembly with dynamic motions
Viruses can cause Colony Collapse Disorder, leading to large losses of honeybee hives globally. In this study, the authors solve capsid structures of honeybee-infecting Lake Sinai viruses and identify distinct features, which advances understanding of viral dynamics, assembly and infection mechanisms.
- Nai-Chi Chen
- , Chun-Hsiung Wang
- & Chun-Jung Chen
-
Article
| Open AccessCryoEM structures of the multimeric secreted NS1, a major factor for dengue hemorrhagic fever
The extracellular secreted NS1 (sNS1) is a major factor contributing to dengue hemorrhagic fever. Here, Shu et al. report sNS1 exists in multiple oligomeric states and presents a tetrameric structure.
- Bo Shu
- , Justin S. G. Ooi
- & Shee-Mei Lok
-
Article
| Open AccessNear-atomic, non-icosahedrally averaged structure of giant virus Paramecium bursaria chlorella virus 1
Giant viruses are large DNA viruses with capsid diameters up to 500 nm. Given technical challenges only few high-resolution structures of viral capsids exist. Here, Shao et al. provide a nearatomic structure of giant virus PBCV-1 capsid and resolve the previously unknown asymmetric capsid components. The local capsid microenvironments created by these components provide insights into the mechanism of capsid assembly of giant viruses.
- Qianqian Shao
- , Irina V. Agarkova
- & Qianglin Fang
-
Article
| Open AccessPolerovirus N-terminal readthrough domain structures reveal molecular strategies for mitigating virus transmission by aphids
The authors present structures of plant polerovirus NRTD proteins that protrude from the viral capsid and show that the purified NRTD can inhibit insect transmission and act as a bioinsecticide, providing a blueprint for control of related viruses.
- Carl J. Schiltz
- , Jennifer R. Wilson
- & Joshua S. Chappie
-
Article
| Open AccessHIV-1 CD4-binding site germline antibody–Env structures inform vaccine design
VRC01-class bNAbs against the CD4 binding site of HIV-1 Env are targets of vaccine design. Here, the authors structurally characterized germline versions of the VRC01-class bNAb, BG24, bound to Env. They reveal mechanisms of germline binding, informing the design of VRC01-class targeting immunogens.
- Kim-Marie A. Dam
- , Christopher O. Barnes
- & Pamela J. Bjorkman
-
Article
| Open AccessAtomic model of vesicular stomatitis virus and mechanism of assembly
Zhou and Si et al. used cryogenic electron microscopy and tomography to delineate the molecular interactions among genomic RNA, nucleocapsid protein, matrix protein and glycoprotein in vesicular stomatitis virus and suggest a model of assembly.
- Kang Zhou
- , Zhu Si
- & Z. Hong Zhou
-
Article
| Open AccessMembrane-assisted assembly and selective secretory autophagy of enteroviruses
Enteroviruses are non-enveloped positive-sense RNA viruses that modulate cytoplasmic membranes for replication. To enlighten how enteroviruses assemble around nascent RNA genomes and get package into autophagosomes for release, Dahmane et al. perform cryo-electron tomography of poliovirus-infected cells. They find assembly intermediates that are only present on the cytosolic side of the replication compartment and provide evidence that host factor VPS34 is involved in progression of assembly intermediates.
- Selma Dahmane
- , Adeline Kerviel
- & Lars-Anders Carlson
-
Article
| Open AccessAssembly mechanism of the pleomorphic immature poxvirus scaffold
Immature poxviruses are characterized by nonicosahedral semiordered protein scaffolds critical for morphogenesis. Here, the authors use cryo-EM structures of Vaccinia virus D13 scaffold intermediates to explain their assembly mechanism.
- Jaekyung Hyun
- , Hideyuki Matsunami
- & Matthias Wolf
-
Article
| Open AccessStructural snapshots of La Crosse virus polymerase reveal the mechanisms underlying Peribunyaviridae replication and transcription
La Crosse is a human life threatening virus belonging to the Bunyavirales order. The structure of its polymerase solved in seven key active states by cryo-electron microscopy reveals the molecular mechanisms of viral RNA replication and transcription.
- Benoît Arragain
- , Quentin Durieux Trouilleton
- & Hélène Malet
-
Article
| Open AccessMultiple conformations of trimeric spikes visualized on a non-enveloped virus
Zhang and Cui et al. present in situ cryoEM structures of the trimeric spike of cytoplasmic polyhedrosis virus in both open and close conformations, and demonstrate that spike detachment from the capsid is triggered by the presence of SAM and ATP.
- Yinong Zhang
- , Yanxiang Cui
- & Z. Hong Zhou
-
Article
| Open AccessCorrelative multi-scale cryo-imaging unveils SARS-CoV-2 assembly and egress
In this study, Peijun Zhang and colleagues use cryoFIB/SEM volume imaging and soft x-ray cryo-tomography with cryo-electron tomography (cryoET) of cellular periphery, lamellae, and subtomogram averaging to place critical structural events in the SARS-CoV-2 infection cycle in the context of whole-cell images.
- Luiza Mendonça
- , Andrew Howe
- & Peijun Zhang
-
Article
| Open AccessAsymmetric reconstruction of mammalian reovirus reveals interactions among RNA, transcriptional factor µ2 and capsid proteins
Mammalian reovirus (MRV) is a double-stranded RNA (dsRNA) virus that affects the gastrointestinal and respiratory tracts. Here, the authors present the 3.3 Å cryo-EM asymmetric reconstruction of transcribing MRV that reveals the organization of the dsRNA genome, RNA interaction with the polymerase complex, and how the polymerase interacts extensively with its co-factor, µ2, to form a transcription enzyme complex, which engages and regulates RNA transcription.
- Muchen Pan
- , Ana L. Alvarez-Cabrera
- & Z. Hong Zhou
-
Article
| Open AccessThe architecture of the SARS-CoV-2 RNA genome inside virion
Secondary structures and long-range RNA interactions of the SARS-CoV-2 genome have been investigated by various sequencing methods. Here the authors use an RNA-RNA hybrid sequencing method to predict the secondary and tertiary structure of the SRAS-CoV-2 RNA genome in the virion.
- Changchang Cao
- , Zhaokui Cai
- & Yuanchao Xue
-
Article
| Open AccessStructural basis for SARS-CoV-2 envelope protein recognition of human cell junction protein PALS1
SARS-CoV-2 viruses are known to hijack human proteins in order to facilitate their own virulence and replication. In this study, Liu and colleagues present structural analysis of how this phenomenon occurs between SARS-CoV-2 viral envelope protein and human PALS1. The findings provide insights in to viral-host recognition.
- Jin Chai
- , Yuanheng Cai
- & Qun Liu
-
Article
| Open AccessA unified route for flavivirus structures uncovers essential pocket factors conserved across pathogenic viruses
Understanding virus assembly could identify potential drug targets. Here the authors use a safe and efficient method to solve pathogenic flavivirus structures, revealing two lipid-like ligands within highly conserved pockets of the stem region of envelope protein that are important for virus maturation.
- Joshua M. Hardy
- , Natalee D. Newton
- & Daniel Watterson
-
Article
| Open AccessStructure of the mature Rous sarcoma virus lattice reveals a role for IP6 in the formation of the capsid hexamer
Inositol hexakisphosphate (IP6) is a known assembly cofactor for HIV-1. Here, the authors show the role of IP6 in the assembly of the Rous sarcoma virus (RSV). Reported cryo-ET structures of mature capsid-like particles (CLPs) suggest that IP6 modulates the formation of capsid polyhedrons of variable shape.
- Martin Obr
- , Clifton L. Ricana
- & Robert A. Dick
-
Article
| Open AccessAsymmetrizing an icosahedral virus capsid by hierarchical assembly of subunits with designed asymmetry
Viruses have been re-engineered for many applications but the ability to build asymmetric capsids in vitro has been lacking. Here, the authors report the design of asymmetric subunits with different growth rates leading to capsids with discrete patches and potential for distinct surface chemistries.
- Zhongchao Zhao
- , Joseph Che-Yen Wang
- & Adam Zlotnick
-
Article
| Open AccessCryo-EM analysis of the HCoV-229E spike glycoprotein reveals dynamic prefusion conformational changes
The spike protein of coronaviruses (S-protein) is an envelope-anchored trimeric type I transmembrane glycoprotein that mediates receptor binding and the fusion of the viral and host cell membranes. Here the authors report the conformational states of HCoV-229E S trimer and observe the conformational changes in S1 subunit from closed state to activated state for receptor binding.
- Xiyong Song
- , Yuejun Shi
- & Guiqing Peng
-
Article
| Open AccessIdentification of a pocket factor that is critical to Zika virus assembly
Here, the authors provide a 3.4 Å resolution structure of mature Zika virus (ZIKV) and identify two lipid moieties, coordinated by hydrophobic residues of the M and E transmembrane helices and between two helices of E protein, that play an essential role in the ZIKV assembly pathway.
- Nadia M. DiNunno
- , Daniel J. Goetschius
- & Joyce Jose
-
Article
| Open AccessCryo-EM structure of the varicella-zoster virus A-capsid
Varicella-zoster virus (VZV) is the causative agent of chickenpox and herpes zoster (shingles). Cryo-EM structure of VZV capsid provides insights into the capsid assembly and reveals a pocket that could potentially be targeted by antiviral drugs.
- Junqing Sun
- , Congcong Liu
- & Peiyi Wang
-
Article
| Open AccessCryo-EM structure of coronavirus-HKU1 haemagglutinin esterase reveals architectural changes arising from prolonged circulation in humans
Human coronavirus-HKU1 contains two surface projections called spike and haemagglutinin-esterase (HE), with the latter acting as a receptor-destroying enzyme. Here, the authors use cryo-EM and mass spectrometry to characterise the small, heavily glycosylated HKU1 HE, revealing a vestigial lectin domain covered with a putative glycan shield; and they discuss these features in the context of host adaptation.
- Daniel L. Hurdiss
- , Ieva Drulyte
- & Raoul J. de Groot
-
Article
| Open AccessThe architecture and stabilisation of flagellotropic tailed bacteriophages
Flagellotropic phages spin down flagella to reach the bacterial surface and must withstand remarkable drag forces. Here authors show how two nested sets of chainmail stabilise the viral head and a beta-hairpin regulates the formation of the robust yet pliable tail, characteristic of siphoviruses.
- Joshua M. Hardy
- , Rhys A. Dunstan
- & Fasséli Coulibaly
-
Article
| Open AccessNSs amyloid formation is associated with the virulence of Rift Valley fever virus in mice
Rift Valley fever virus (RVFV) can cause severe diseases in humans, including encephalitis. Here the authors show that NSs, the major virulence factor of RVFV, is an amyloidogenic protein forming fibrils in infected mouse brains and causing increased mortality in mice.
- Psylvia Léger
- , Eliana Nachman
- & Pierre-Yves Lozach
-
Article
| Open AccessCryo-EM structures of HKU2 and SADS-CoV spike glycoproteins provide insights into coronavirus evolution
Several coronaviruses infecting humans and animals have emerged in recent years. Here, the authors provide structures of the spike proteins of the porcine coronavirus SADS-CoV and closely related bat coronavirus HKU2, providing insights into evolution of coronavirus spike proteins.
- Jinfang Yu
- , Shuyuan Qiao
- & Xinquan Wang
-
Article
| Open AccessStructure and mechanism of DNA delivery of a gene transfer agent
Gene transfer agents (GTAs) are phage-like particles that mediate lateral gene exchange. Here, the authors provide the structure of the GTA of Rhodobacter capsulatus (RcGTA), which resembles a tailed phage, and describe the conformational changes required for DNA ejection.
- Pavol Bárdy
- , Tibor Füzik
- & Pavel Plevka
-
Article
| Open AccessStructural morphing in a symmetry-mismatched viral vertex
In icosahedral viruses, a symmetry-mismatched portal vertex is assembled by inserting a 12-fold-symmetric portal complex into a 5-fold-symmetric capsid environment. Here, the authors report a near-atomic-resolution in situ cryo-electron microscopy structure of this symmetrically mismatched viral vertex from bacteriophage T4.
- Qianglin Fang
- , Wei-Chun Tang
- & Venigalla B. Rao
-
Article
| Open AccessDisruption of the HIV-1 Envelope allosteric network blocks CD4-induced rearrangements
Here, using cryo-EM and smFRET, Henderson et al. show how tryptophan 571 in the HIV-1 Env acts as a conformational switch during receptor-mediated viral entry and design HIV-1 Env proteins that cannot undergo conformational changes. This has important implications for HIV-1 vaccine design.
- Rory Henderson
- , Maolin Lu
- & S. Munir Alam
-
Article
| Open AccessCryo-EM structure of the respiratory syncytial virus RNA polymerase
Respiratory syncytial virus (RSV) is a pathogenic non-segmented negative-sense RNA virus and active RSV polymerase is composed of a 250 kDa large (L) protein and tetrameric phosphoprotein (P). Here, the authors present the 3.67 Å cryo-EM structure of the RSV polymerase (L:P) complex.
- Dongdong Cao
- , Yunrong Gao
- & Bo Liang