Recombinant full-length human cytomegalovirus protease has lower activity than recombinant processed protease domain in purified enzyme and cell-based assays
| Autor: | Christy L Funckes-Shippy, Paul J. Hippenmeyer, Arthur J. Wittwer |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Transcriptional Activation
Recombinant Fusion Proteins medicine.medical_treatment Molecular Sequence Data Cytomegalovirus Herpesvirus 1 Human Biology Substrate Specificity law.invention Viral Proteins Capsid law Virology Chlorocebus aethiops Endopeptidases Escherichia coli medicine Animals Humans Amino Acid Sequence Vero Cells Pharmacology chemistry.chemical_classification NS3 Protease Serine Endopeptidases Herpes Simplex Virus Protein Vmw65 beta-Galactosidase Molecular biology Fusion protein Molecular Weight NS2-3 protease Enzyme Biochemistry chemistry Recombinant DNA MASP1 |
| Zdroj: | Antiviral Research. 55:291-306 |
| ISSN: | 0166-3542 |
| DOI: | 10.1016/s0166-3542(02)00051-7 |
| Popis: | Herpesviruses encode a protease that is essential for virus replication. The protease undergoes cleavage to a processed form during capsid maturation. A recombinant 75 kDa form of the protease from human cytomegalovirus was purified and compared with the recombinant 29 kDa processed form. Modification with an active site titrant suggested that most of each recombinant protease preparation was active (66 and 86%, respectively). Protease activity was compared using a low-molecular weight peptide substrate and the native substrate, capsid assembly protein. In addition, a cell-based assay for both enzymes was developed in which the target sequence of the protease has been fused inframe into the herpes simplex virus VP16 molecule. Cleavage of the fusion protein by the protease releases the carboxyl terminal transactivation domain, resulting in a decrease in the ability of the fusion molecule to transactivate a target promoter linked to a reporter gene in mammalian cells. Results suggest that the 75 kDa form of the enzyme is significantly less active than the 29 kDa form by all criteria. |
| Databáze: | OpenAIRE |
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