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Isolation of the human PC6 gene encoding the putative host protease for HIV-1 gp160 processing in CD4+ T lymphocytes
L Miranda1, J Wolf, S Pichuantes
1Department of Cellular and Structural Biology, Molecular Biology Program, University of Colorado Cancer Center, Denver 80262, USA.
Summary
Identifying the host cell protease crucial for HIV-1 production is key. Human PC6 proteases (hPC6A and hPC6B) in CD4+ T cells are the most likely candidates for processing the HIV-1 envelope glycoprotein gp160.
Area of Science:
- Virology
- Molecular Biology
- Cell Biology
Background:
- HIV-1 virion production relies on host cell proteases to process the envelope glycoprotein gp160.
- Mammalian subtilisin-like protein convertases (SPCs) are implicated in proprotein maturation, cleaving at basic amino acid motifs.
Purpose of the Study:
- To identify the specific host cell protease responsible for processing HIV-1 gp160 in human CD4+ T lymphocytes.
- To investigate the role of SPCs in HIV-1 pathogenesis.
Main Methods:
- Reverse transcription-PCR and Northern blot analyses were employed to determine the range of SPC proteases in human CD4+ T cells.
- Novel human PC6 (hPC6) genes were cloned and their expression patterns analyzed.
- Comparison of SPC gene expression in T cells versus furin-defective LoVo cells.
Main Results:
- Two isoforms of the hPC6 protease, hPC6A and hPC6B, were found to be expressed in human T cells.
- The expression patterns of SPCs in T cells were characterized.
- hPC6 gene products emerged as the most probable proteases for HIV-1 gp160 processing.
Conclusions:
- The human PC6 gene products (hPC6A and hPC6B) are strongly implicated as the host cell proteases responsible for processing HIV-1 gp160.
- This finding advances our understanding of HIV-1 replication mechanisms at the cellular level.
- Further research into hPC6 proteases could reveal new therapeutic targets for HIV-1 infection.