NDLI: Altered Rous sarcoma virus Gag polyprotein processing and its effects on particle formation.

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Altered Rous sarcoma virus Gag polyprotein processing and its effects on particle formation.

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Altered Rous sarcoma virus Gag polyprotein processing and its effects on particle formation.

Content Provider	PubMed Central
Author	Xiang, Y. Ridky, T. W. Krishna, N. K. Leis, J.
Abstract	Proteolytic processing of the Rous sarcoma virus (RSV) Gag precursor was altered in vivo through the introduction of amino acid substitutions into either the polyprotein cleavage junctions or the PR coding sequence. Single amino acid substitutions (V(P2)S and P(P4)G), which are predicted from in vitro peptide substrate cleavage data to decrease the rate of release of PR from the Gag polyprotein, were placed in the NC portion of the NC-PR junction. These substitutions do not affect the efficiency of release of virus-like particles from COS cells even though recovered particles contain significant amounts of uncleaved Pr76gag in addition to mature viral proteins. Single amino acid substitutions (A(P3)F and S(P1)Y), which increase the rate of PR release from Gag, also do not affect budding of virus-like particles from cells. Substitution of the inefficiently cleaved MA-p2 junction sequence in Gag by eight amino acids from the rapidly cleaved NC-PR sequence resulted in a significant increase in cleavage at the new MA-p2 junction, but again without an effect on budding. However, decreased budding was observed when the A(P3)F or S(P1)Y substitution was included in the NC-PR junction sequence between the MA and p2 proteins. A budding defect was also caused by substitution into Gag of a PR subunit containing three amino acid substitutions (R105P, G106V, and S107N) in the substrate binding pocket that increase the catalytic activity of PR. The defect appears to be the result of premature proteolytic processing that could be rescued by inactivating PR through substitution of a serine for the catalytic aspartic acid residue. This budding defect was also rescued by single amino acid substitutions in the NC-PR cleavage site which decrease the rate of release of PR from Gag. A similar budding defect was caused by replacing the Gag PR with two PR subunits covalently linked by four glycine residues. In contrast to the defect caused by the triply substituted PR, the budding defect observed with the linked PR dimer could not be rescued by NC-PR cleavage site mutations, suggesting that PR dimerization is a limiting step in the maturation process. Overall, these results are consistent with a model in which viral protein maturation occurs after PR subunits are released from the Gag polyprotein.
Starting Page	2083
File Format	PDF
ISSN	10985514
e-ISSN	10985514
Journal	Journal of Virology
Issue Number	3
Volume Number	71
Language	English
Publisher Date	1997-03-01
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Virology Immunology Microbiology Insect Science

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