What is the receptor for measles?
Two cell surface receptors, CD46 and signaling lymphocyte-activation molecule (SLAM), have been identified as measles virus receptors. CD46 is ubiquitously expressed on all nucleated cells and acts as a receptor for the Edmonston strain and all vaccine strains derived from it.
How Does measles virus enter cells?
The measles virus (MV), a member of the family Paramyxoviridae, enters cells through a cellular receptor, the signaling lymphocyte activation molecule (SLAM), CD46 or nectin-4. Entry is mediated by two MV envelope glycoproteins, the hemagglutinin (H) and the fusion (F) protein.
What cells does the measles virus target?
Measles virus is spread from person to person through the air in coughed-out aerosolized droplets that are inhaled. The virus typically first comes in contact with host lung tissue, where it infects immune cells called macrophages and dendritic cells, which serve as an early defense and warning system.
What does measles bind to?
Wild-type measles virus binds to cells primarily through the cellular receptor SLAM whereas most vaccine strains bind to CD46; however, most measles virus strains can use both CD46 and SLAM as receptors during acute infection (Schneider et al., 2002).
Do measles have neuraminidase?
As a member of the Morbillivirus genus in the Paramyxoviridae family, measles virus expresses a hemagglutinin protein (MVH) that lacks neuraminidase activity, an activity essential to the life cycles of many viruses1.
Does measles have DNA or RNA?
The measles virus is a single-stranded RNA virus of the genus Morbillivirus and the family Paramyxoviridae. The virus is related to several viruses that infect animals, including the Canine Distemper Virus.
Does the measles virus have DNA or RNA?
What are the virulence factors of measles?
It consists of a helical nucleocapsid, 100-300 nm in diameter, surrounded by an envelope. The envelope is lined by matrix proteins and carries transmembrane hemaglutinin and fusion glycoproteins which are the virulence factors.
What are measles virulence factors?
What does hemagglutinin do in measles?
Measles virus (MV), a member of the genus Morbillivirus in the family Paramyxoviridae of the order Mononegavirales, possesses two glycoproteins in its envelope: the hemagglutinin (H) protein, responsible for attachment to the cellular receptors, and the fusion (F) protein, which mediates the fusion of the viral and …
What type of genome is measles?
The causative agent, measles virus (MV), is an enveloped virus with a negative-sense single-stranded RNA genome and is a member of the genus Morbillivirus within the family Paramyxoviridae (1).
Which virus has both DNA and RNA?
Leuko virus
Leuko virus (a Retro virus) possess both DNA & RNA in life cycle.
What is a RNA in measles?
Measles morbillivirus (MeV), also called measles virus (MV), is a single-stranded, negative-sense, enveloped, non-segmented RNA virus of the genus Morbillivirus within the family Paramyxoviridae. It is the cause of measles. Humans are the natural hosts of the virus; no animal reservoirs are known to exist.
What is the pathogenesis of measles virus?
According to textbook descriptions of the pathogenesis of measles, MV first infects and replicates in epithelial cells of the respiratory tract, followed by infection of the regional lymphoid organs. From there, infected monocytes were hypothesized to disseminate the virus during the viremic phase.
Does measles use neuraminidase?
What is sialic acid receptor?
Sialic acid linked to glycoproteins and gangliosides is used by many viruses as a receptor for cell entry. These viruses include important human and animal pathogens, such as influenza, parainfluenza, mumps, corona, noro, rota, and DNA tumor viruses.
Does measles virus have hemagglutinin?
Measles virus (MV) is an enveloped virus that belongs to the genus Morbillivirus of the family Paramyxoviridae and possesses two types of surface glycoprotein spikes, the hemagglutinin (H) and fusion (F) proteins. MV infection is initiated by binding of the H protein to cellular receptors on the target host cells.
Is measles a RNA or DNA virus?
Is measles vaccine RNA or DNA?
DNA vaccines for measles, mumps, and rubella viruses have been constructed and tested in animal models but are poorly immunogenic. Several other prototype candidate vaccines are possible, including those based on the rubella virus component of the vaccine as a vector.
How does measles infect the cell membrane?
The hemagglutinin (H) protein of measles virus (MeV) interacts with a cellular receptor which constitutes the initial stage of infection. Binding of H to this host cell receptor subsequently triggers the F protein to activate fusion between virus and host plasma membranes.
What are the glycoproteins of measles virus (MV)?
Measles virus (MV) has two envelope glycoproteins, the hemagglutinin (H) and fusion protein, which are responsible for attachment and membrane fusion, respectively.
What is the role of nectin-4 receptors in the pathogenesis of measles?
Nectin-4 is a secondary exit receptor which allows measles virus to replicate and amplify in the airways, where the virus is expelled from the body in aerosol droplets. The amino acid residues of H protein that are involved in binding to each of the receptors have been identified through X-ray crystallography and site-specific mutagenesis.
What is the function of the hemagglutinin beta-propeller head in measles?
The measles virus hemagglutinin beta-propeller head β4-β5 hydrophobic groove governs functional interactions with nectin-4 and CD46 but not those with the signaling lymphocytic activation molecule. J. Virol. 2013;87:9208–9216. doi: 10.1128/JVI.01210-13.