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ABSTRACT: Coronavirus resistance to papain-like protease inhibitors

PROVIDER: PRJNA1244330 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR32923462_1.fastq.gz	Fastqsanger.gz
	SRR32923462_2.fastq.gz	Fastqsanger.gz
	SRR32923463_1.fastq.gz	Fastqsanger.gz
	SRR32923463_2.fastq.gz	Fastqsanger.gz
	SRR32923464_1.fastq.gz	Fastqsanger.gz

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Microarray analyses of lymph node dendritic cells (DCs) stimulated in vitro with papain or LPS

Project description:T helper type 2 (Th2) responses are induced by protease allergens and helminthes. However the molecular mechanisms that initiate Th2 responses are poorly understood. To obtain insight into this mechanism, we performed a microarray analysis of lymph node DCs stimulated in vitro with the protease allergen papain, or with LPS, a Th1 inducing stimulus. Key words: Th2 response, LPS, dendritic cells, Papain CD11c+ DCs were isolated from the lymph nodes of C57BL/6 mice, and cultured in vitro (1x106 DCs per ml) with 500 3T3-CD40L fibroblasts, either alone, or in the presence of papain (25 µg/ml) or LPS (1 µg/ml). 4h and 17h later, the cells were harvested and RNA isolated and processed for microarray analyses. RNA was extracted and processed from freshly isolated LN DCs. For a given time point, the expression profile of DCs treated with papain or LPS, were compared to that of untreated DCs

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Project description:A papain-like cysteine protease-released small signal peptide confers wheat resistance to WYMV infection

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Project description:SARS-CoV-2, a human coronavirus, is the causative agent of the COVID-19 pandemic, entailing enormous disruption worldwide. Its ~30 kb RNA genome is translated into two large polyproteins subsequently cleaved by viral papain-like protease and main protease (Mpro/nsp5). Polyprotein processing is essential yet incompletely understood. We studied Mpro-mediated processing of the nsp7-10/11 polyprotein, whose mature products are cofactors of the viral replicase, identifying the order of cleavages: 1) nsp9-10, 2) nsp8-9/nsp10-11, and 3) nsp7-8. Integrative modeling based on mass spectrometry (including hydrogen-deuterium exchange and cross-linking) and X-ray scattering yielded three-dimensional models of the nsp7-10/11 polyprotein, and the data suggest that the nsp7-10/11 structure in complex with Mpro strongly resembles the unbound polyprotein. Our array of techniques supports the notion that interplay between polyprotein conformation and junction accessibility determine the preference and order of cleavages. Finally, we leveraged assays of limited proteolysis by Mpro of nsp7-11 using a series of inhibitors/binders to characterize Mpro inhibition using a polyprotein substrate.

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