期刊
VIROLOGY
卷 407, 期 2, 页码 281-288出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.virol.2010.08.015
关键词
Capsid assembly; Virus assembly; Electrostatics; Hepatitis B virus; Brome Mosaic Virus; Absorbance spectroscopy; RNA content; DNA content
类别
资金
- National Institutes of Health [R01-AI077688]
UV spectra of viruses are complicated by overlapping protein and RNA absorbance and light scattering. We describe and validate methodology for estimating RNA and protein concentration from such spectra. Importantly, we found that encapsidation did not substantially affect RNA absorbance. Combining absorbance data with a known T number, we confirmed that brome mosaic virus packages about 3100 nucleotides/capsid, consistent with its genome. E. coli-expressed hepatitis B virus (HBV) packages host RNA based on capsid charge and volume. We examined HBV capsid protein (Cp183, + 15 charge) and a less basic mutant (Cp183-EEE, +12 charge) that mimics a phosphorylated state. Cp183-EEE packaged -3450 nucleotides per T=4 capsid and Cp183 packaged -4800 nucleotides, correlating to the size of HBV's RNA pre-genome and mature DNA genome, respectively. The RNA:protein charge ratio (about 1.4 phosphates per positive charge) was consistent with that of other ssRNA viruses. This spectroscopic method is generalizable to any virus-like particle. (C) 2010 Elsevier Inc. All rights reserved.
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