Work with LifeSpan to design a custom immunohistochemistry to address your specific biological question. Outsource the entire localization process without having to worry about finding and characterizing target specific antibodies, sourcing and validating difficult-to-find tissues, and having the ability to interpret the resulting immunostaining in relation to complex human pathologies.TCR Screening Services
Test your therapeutic antibodies in immunohistochemistry against a broad panel of normal frozen human tissue types in order to determine potential unintended binding. Our non-GLP TCR services are designed on the FDA recommendation outlined in their "Points to Consider in the Manufacture and Testing of Monoclonal Antibody Products for Human Use".
LSBio offers many products related to coronaviruses, including antibodies, proteins, detection kits and expression-ready ORF clones.
Coronaviruses (CoVs) are enveloped viruses with positive-sense, single-stranded RNA genomes that range in size from 26 to 32 kilobases, the largest among RNA viruses. They are pathogens known to infect humans and numerous other animal species. Based on genetic and antigenic criteria, CoVs have been organized into four groups: alpha, beta, gamma, and delta coronaviruses (Dhama, 2014; Coleman, 2014).
Common human coronaviruses include the 229E and NL63 alpha coronaviruses and the OC43 and HKU-1 beta coronaviruses. In infected humans, they are associated with a range of cold-like symptoms as well as severe respiratory tract infections (Fielding, 2011). Other more symptomatically severe human coronaviruses that have been transmitted from animals include MERS-CoV, a beta coronavirus that causes Middle East Respiratory Syndrome (MERS); SARS-CoV, a beta coronavirus that causes severe acute respiratory syndrome (SARS); and SARS-CoV-2, a beta coronavirus that causes coronavirus disease 2019 (COVID-19).
Proteins that contribute to the overall structure and function of all coronaviruses are the spike (S), envelope (E), membrane (M), and nucleocapsid (N) proteins, as well as the non-structural proteins cleaved from the orf1a/b polyprotein. Important non-structural proteins include the RNA-dependent RNA polymerase, protease, and endoRNAse (Fehr, 2016).
The spike (S) protein is responsible for attachment to and fusion with the host cell. For both SARS-CoV and SARS-CoV-2, the host receptor is known to be angiotensin converting enzyme 2 (ACE2) (Hoffman, 2020). The nucleocapsid (N) protein binds to the CoV genome and is responsible for packaging it into the ribonucleoprotein complex (capsid). The membrane (M) protein determines the shape of the viral envelope and organizes viral assembly through interaction with each additional structural protein. The envelope (E) protein is the smallest of the structural proteins and is incorporated into the virion envelope, but this represents only a small amount of total expressed envelope protein. A high proportion is also expressed inside the infected cell, where it is involved in viral assembly, budding, maturation and propagation (Schoeman, 2019; Chang, 2020).
The SARS-CoV-2 (COVID-19) coronavirus genome has 89% sequence similarity with the bat SARS-like CoVZXC21 coronavirus, and 82% similarity with human SARS-CoV coronavirus. The orf1a/b, S, E, M, and N proteins also share a high degree of phylogenetic similarity with bat, civet, and human SARS coronaviruses. Notable differences in sequence are found in the SARS-CoV-2 spike protein’s receptor binding domain, which has only 40% amino acid overlap with other related viruses. Furthermore, the SARS-CoV-2 orf3b protein represents a completely novel short protein (Rehman, 2020; Chan, 2020).