UniProtKB/Swiss-Prot entry P13887

• FUNCTION: P123 is short-lived polyproteins, accumulating during early stage of infection. It localizes the viral replication complex to the cytoplasmic surface of modified endosomes and lysosomes. By interacting with nsP4, it starts viral genome replication into antigenome. After these early events, P123 is cleaved sequentially into nsP1, nsP2 and nsP3. This sequence of delayed processing would allow correct assembly and membrane association of the RNA polymerase complex (By similarity).
• FUNCTION: nsP1 is a cytoplasmic capping enzyme. This function is necessary since all viral RNAs are synthesized in the cytoplasm, and host capping enzymes are restricted to the nucleus. The enzymatic reaction involves a covalent link between 7-methyl-GMP and nsP1, whereas eukaryotic capping enzymes form a covalent complex only with GMP. nsP1 capping would consist in the following reactions: GTP is first methylated and then forms the m7GMp-nsP1 complex, from which 7-methyl-GMP complex is transferred to the mRNA to create the cap structure. Palmitoylated nsP1 is remodeling host cell cytoskeleton, and induces filopodium-like structure formation at the surface of the host cell (By similarity).
• FUNCTION: nsP2 has two separate domain with different biological activities. The N-terminal section is part of the RNA polymerase complex and has RNA trisphosphatase and RNA helicase activity. The C-terminal section harbors a protease that specifically cleaves and releases the four mature proteins (By similarity).
• FUNCTION: nsP3 is essential for minus strand and subgenomic 26S mRNA synthesis (By similarity).
• FUNCTION: nsP4 is a RNA dependent RNA polymerase. It replicates genomic and antigenomic RNA by recognizing replications specific signals. Transcribes also a 26S subgenomic mRNA by initiating RNA synthesis internally on antigenomic RNA. This 26S mRNA encodes for structural proteins (By similarity).
• CATALYTIC ACTIVITY: S-adenosyl-L-methionine + GTP = m₇GTP.
• CATALYTIC ACTIVITY: m₇GTP + (5')pp-Pur-mRNA = diphosphate + m₇G(5')ppp-Pur-mRNA.
• CATALYTIC ACTIVITY: (5')ppp-mRNA + H₂O = (5')pp-mRNA + phosphate.
• CATALYTIC ACTIVITY: A 5'-phosphopolynucleotide + H₂O = a polynucleotide + phosphate.
• CATALYTIC ACTIVITY: NTP + H₂O = NDP + phosphate.
• CATALYTIC ACTIVITY: Nucleoside triphosphate + RNA(n) = diphosphate + RNA(n+1).
• SUBUNIT: P123 interacts with nsP4; nsP1, nsP2, nsP3 and nsP4 interact with each other, and with uncharacterized host factors (By similarity).
• SUBCELLULAR LOCATION: Non-structural polyprotein: Endosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Lysosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Note=Located on the cytoplasmic surface of modified endosomes and lysosomes, also called cytopathic vacuoles type I (CPVI). These vacuoles contain numerous small circular invaginations (spherules) which may be the sites of RNA synthesis.
• SUBCELLULAR LOCATION: P123: Endosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Lysosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity).
• SUBCELLULAR LOCATION: mRNA-capping enzyme nsP1: Endosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Lysosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Cell membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Note=In the late phase of infection, the polyprotein is quickly cleaved before localization to cellular membranes. Then a fraction of nsP1 localizes to the inner surface of the plasma membrane (By similarity).
• SUBCELLULAR LOCATION: Protease/triphosphatase/NTPase/helicase nsP2: Endosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Lysosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Nucleus (By similarity). Note=In the late phase of infection, the polyprotein is quickly cleaved before localization to cellular membranes. Then approximately half of nsP2 is found in the nucleus (By similarity).
• SUBCELLULAR LOCATION: Non-structural protein 3: Endosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Lysosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Cytoplasm (By similarity). Note=In the late phase of infection, the polyprotein is quickly cleaved before localization to cellular membranes. Then nsP3 and nsP3' seems to aggregate in cytoplasm (By similarity).
• SUBCELLULAR LOCATION: RNA-directed RNA polymerase nsP4: Endosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity). Lysosome membrane; Peripheral membrane protein; Cytoplasmic side (By similarity).
• INDUCTION: Viral replication produces dsRNA in the late phsae of infection, resulting in a strong activation of host EIF2AK2/PKR, leading to almost complete phosphorylation of EIF2A. This inactivates completely cellular translation initiation, resulting in a dramatic shutoff of proteins synthesis. Translation of viral non-structural polyprotein and all cellular proteins are stopped in infected cell between 2 and 4 hours post infection. Only the 26S mRNA is still translated into viral structural proteins, presumably through a unique mechanism of enhancer element which counteract the translation inhibition mediated by EIF2A. By doing this, the virus uses the cellular defense for its own advantage: shutoff of cellular translation allows to produce big amounts of structural proteins needed for the virus to bud out of the doomed cell.
• PTM: Specific enzymatic cleavages in vivo yield mature proteins. The polyprotein is synthesized as P1234 by stop codon readthrough. This polyprotein is processed differently depending on the stage of infection. In early stages, P1234 is first cleaved in trans, through its nsP2 protease activity, releasing P123 and nsP4. P123 and nsP4 start to replicate the viral genome into its antigenome. After these early events, nsP1 is cleaved in cis by nsP2 protease, releasing P23 polyprotein. Cleavage of nsP1 exposes an "activator" at the N-terminus of P23 which induces its cleavage into nsP2 and nsP3 by the viral protease. This sequence of delayed processing would allow correct assembly and membrane association of the RNA-polymerase complex. In the late stage of infection, the presence of free nsP2 in the cytoplasm cleaves P1234 quickly into P12 and P34, then into the four nsP (By similarity).
• PTM: nsP1 is palmitoylated by host.
• PTM: nsP3 is phosphorylated by host on serines and threonines.
• PTM: nsP4 is ubiquitinated; targets the protein for rapid degradation via the ubiquitin system (By similarity).
• SIMILARITY: Contains 1 Macro domain.
• SIMILARITY: Contains 1 peptidase C9 domain [view classification].
• SIMILARITY: Contains 1 RdRp catalytic domain.
• CAUTION: There is no stop codon readthrough before nsp4.