Was ist die Funktion der M Proteine und die der C Proteine beim FSME Virus?

1 Antwort

Hi,

es gibt 3 Strukturproteine C, M und E. E hatten wir schon besprochen, das waren diese Golfschläger, die aus der Virusoberfläche herausragen und die Kontaktaufnahme mit der Wirtszelle sowie die Aufnahme in die Wirtszelle auslösen.

Das C-Protein bildet das Capsid, die Proteinhülle des Virus. M und E-Protein sind in der das Capsid umgebenden Membran untergebracht.

Die Rolle des M-Proteins in der Membran ist noch unbekannt. Es gibt die Hypothese, dass es die Struktur des E-Proteins in bestimmten Situationen stabilisiert.

Brauchst du Quellenangabe?

The flavivirus genome contains a single open reading frame that encodes three structural proteins and seven nonstructural proteins. The structural proteins consist of the capsid protein and the membrane (M) and envelope (E) proteins, which are on the surface of virions. The M protein is initially expressed as a preprotein (prM) and is cleaved by the enzyme furin to generate the mature virus particle ( 8). The M and E proteins form a heteromeric complex on the surface of virions ( 4). The E glycoprotein is the major surface protein for the flaviviruses, and the crystal structure for the soluble ectodomain of the E protein has been determined ( 7). The E protein is highly antigenic and is thought to contain the receptor binding domain and fusion peptide required for receptor-mediated entry into host cells. The role of the M protein on the surface of virions is unknown. It has been suggested that the prM protein plays a role in the folding of the E protein by facilitating a conformation that is unstable at the low pH of endosomes ( 126). 

Holbrook, Michael, R. et al.: Langat Virus M Protein Is Structurally Homologous to prM. link: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC114893/

"Langat Virus" ist FSME. LG