The role of NSP6 in the biogenesis of the SARS-CoV-2 replication organelleby Simona Ricciardi et al.
SARS-CoV-2, like other coronaviruses, builds a membrane-bound replication organelle (RO) to enable RNA replication1. The SARS-CoV-2 RO is composed of double membrane vesicles (DMVs) tethered to the endoplasmic reticulum (ER) by thin membrane connectors2, but the viral proteins and the host factors involved are currently unknown. Here we identify the viral non-structural proteins (NSPs) that generate the SARS-CoV-2 RO. NSP3 and NSP4 generate the DMVs while NSP6, through oligomerization and an amphipathic helix, zippers ER membranes and establishes the connectors. The NSP6ΔSGF mutant, which arose independently in the α, β, γ, η, ι, and λ variants of SARS-CoV-2, behaves as a gain-of-function mutant with a higher ER-zippering activity. We identified three main roles for NSP6: to act as a filter in RO-ER communication allowing lipid flow but restricting access of ER luminal proteins to the DMVs, to position and organize DMV clusters, and to mediate contact with lipid droplets (LDs) via the LD-tethering complex DFCP1-Rab18. NSP6 thus acts as an organizer of DMV clusters and can provide a selective track to refurbish them with LD-derived lipids. Importantly, both properly formed NSP6 connectors and LDs are required for SARS-CoV-2 replication. Our findings, uncovering the biological activity of NSP6 of SARS-CoV-2 and of other coronaviruses, have the potential to fuel the search for broad antiviral agents.
COVID-19 en América Latina y Caribe: Determinación de prioridades en investigación y llamado a la acciónby Nicole Feune de Colombi et al.
The Global Health Network (www.tghn.org) established in January 2020 a community of practice to address research on COVID-19 in low/middle-income countries.
Epidemiological and clinical characteristics of the first 557 successive patients with COVID-19 in Pernambuco state, Northeast Brazilby Jurandy Júnior Ferraz deMagalhães et al.
PRE-PRINT: Non-permissive SARS-CoV-2 infection of neural cells in the developing human brain and neurospheresby Carolina da S. G. Pedrosa et al.
Coronavirus disease 2019 (COVID-19) was initially described as a viral infection of the respiratory tract. It is now known, however, that many other biological systems are affected, including the central nervous system (CNS). Neurological manifestations such as stroke, encephalitis, and psychiatric conditions have been reported in COVID-19 patients, but its neurotropic potential is still debated. Here, we investigate the presence of SARS-CoV-2 in the brain from an infant patient deceased from COVID-19. FULL TEXT
Psycho-Neuroendocrine-Immune Interactions in COVID-19: Potential Impacts on Mental Healthby Ícaro Raony, Camila Saggioro de Figueiredo, Pablo Pandolfo, Elizabeth Giestal-de-Araujo, Priscilla Oliveira-Silva Bomfim, Wilson Savino
Coronavirus disease 2019 (COVID-19) is caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). The impacts of the disease may be beyond the respiratory system, also affecting mental health. Several factors may be involved in the association between COVID-19 and psychiatric outcomes, such as fear inherent in the pandemic, adverse effects of treatments, as well as financial stress, and social isolation.