Journal
VIROLOGY
Volume 325, Issue 2, Pages 320-327Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2004.04.034
Keywords
virus assembly; capsid formation kinetics; light scattering; protein polymerization; protein nucleation
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Funding
- NCI NIH HHS [CA37667, R01 CA037667] Funding Source: Medline
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Pentamers of the L1 major capsid protein of human papillomavirus (HPV type 11) were purified after expression in E. coli and analyzed for the kinetics of in vitro capsid self-assembly using multi-angle light scattering (MALS). Pentamers self-assembled into capsid-like structures at a rate that was a function of protein concentration. The kinetics of capsid fort-nation were sigmoidal with a concentration-dependent lag phase, followed by a rapid increase in polymerization. Nucleation size and the rate order of subsequent subunit addition were calculated from the concentration dependence of the extent of capsid formation and the rate of the fast phase, respectively. Assembly was second order with a nucleation size of two pentamers. Thus, we suggest that dimers of pentamers are the nucleus for L1 assembly into capsid-like structures, with rapid sequential addition of single pentamers to the growing shell. Although studied in vitro without accessory factors that may be present in vivo, these data are in contrast with the five-around-one assembly nucleus previously proposed for polyomaviruses. (C) 2004 Elsevier Inc. All rights reserved.
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