Foamy Retrovirus Integrase Contains a Pol Dimerization Domain Required for Protease Activation
| Autor: | Eun Gyung Lee, Maxine L. Linial, Jacqueline Roy, Patrick K. Clark, Stephen H. Hughes, Paul L. Boyer, Dana L. Jackson |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Leucine zipper
viruses medicine.medical_treatment Immunology Mutant Gene Products pol Simian foamy virus Microbiology Cell Line Catalytic Domain Virology medicine Animals Humans Leucine Zippers Protease Integrases biology Structure and Assembly Processivity biology.organism_classification Genes pol Molecular biology Reverse transcriptase Integrase Enzyme Activation Insect Science Mutation biology.protein Protein Multimerization Peptide Hydrolases |
| Zdroj: | Journal of Virology. 85:1655-1661 |
| ISSN: | 1098-5514 0022-538X |
| DOI: | 10.1128/jvi.01873-09 |
| Popis: | Unlike orthoretroviruses, foamy retroviruses (FV) synthesize Pol independently of Gag. The FV Pol precursor is cleaved only once between reverse transcriptase (RT) and integrase (IN) by the protease (PR), resulting in a PR-RT and an IN protein. Only the Pol precursor, not the cleaved subunits, is packaged into virions. Like orthoretroviral PRs, FV PR needs to dimerize to be active. Previously, we showed that a Pol mutant lacking IN has defects in PR activity and Pol packaging into virions. We now show that introduction of a leucine zipper (zip) dimerization motif in an IN truncation mutant can restore PR activity, leading to Pol processing in cells. However, these zip mutants neither cleave Gag nor incorporate Pol into virions. We propose that IN is required for Pol dimerization, which is necessary for the creation of a functional PR active site. |
| Databáze: | OpenAIRE |
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