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Journal of Virology, May 2003, p. 5439-5450, Vol. 77, No. 9
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.9.5439-5450.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Functional Surfaces of the Human Immunodeficiency Virus Type 1 Capsid Protein

Uta K. von Schwedler, Kirsten M. Stray, Jennifer E. Garrus, and Wesley I. Sundquist*

Department of Biochemistry, University of Utah, Salt Lake City, Utah 84132

Received 10 July 2002/ Accepted 6 February 2003

The human immunodeficiency virus type 1 initially assembles and buds as an immature particle that is organized by the viral Gag polyprotein. Gag is then proteolyzed to produce the smaller capsid protein CA, which forms the central conical capsid that surrounds the RNA genome in the mature, infectious virus. To define CA surfaces that function at different stages of the viral life cycle, a total of 48 different alanine-scanning surface mutations in CA were tested for their effects on Gag protein expression, processing, particle production and morphology, capsid assembly, and infectivity. The 27 detrimental mutations fall into three classes: 13 mutations significantly diminished or altered particle production, 9 mutations failed to assemble normal capsids, and 5 mutations supported normal viral assembly but were nevertheless reduced more than 20-fold in infectivity. The locations of the assembly-defective mutations implicate three different CA surfaces in immature particle assembly: one surface encompasses helices 4 to 6 in the CA N-terminal domain (NTD), a second surrounds the crystallographically defined CA dimer interface in the C-terminal domain (CTD), and a third surrounds the loop preceding helix 8 at the base of the CTD. Mature capsid formation required a distinct surface encompassing helices 1 to 3 in the NTD, in good agreement with a recent structural model for the viral capsid. Finally, the identification of replication-defective mutants with normal viral assembly phenotypes indicates that CA also performs important nonstructural functions at early stages of the viral life cycle.

* Corresponding author. Mailing address: Department of Biochemistry, University of Utah, 20 N 1900 East, Salt Lake City, UT 84132-3201. Phone: (801) 585-5402. Fax: (801) 581-7959. E-mail: wes{at}biochem.utah.edu.

Journal of Virology, May 2003, p. 5439-5450, Vol. 77, No. 9
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.9.5439-5450.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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