ISSN:
1432-8798
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary. Biological active cDNA clones of cucumber mosaic virus (CMV) RNAs 1 and 2 were modified by addition of sequences that encode hexahistidine (His-tag) at the amino- (N-) or carboxy- (C-) terminus of the 1a and 2a proteins. These proteins are essential components of the viral RNA-dependent RNA polymerase (RdRp). In all but one case, addition of the His-tag did not significantly affect the yields of the corresponding viruses and the His-tag-encoding sequences were maintained after mechanical passages. No differences were observed among the in vitro activities of the modified vs. wild-type viral RdRps. Subcellular fractionation showed that 2a protein was found both membrane-associated and in the 30,000 × g soluble fraction. Both termini of the native His-tag 2a protein could bind to a resin containing nickel-nitrilotriacetic acid (Ni2+-NTA). Detergent-treated RdRp containing C-terminal His-tagged 1a and 2a proteins was chromatographed on Ni2+-NTA resin. The activity of the eluted RdRp was template- dependent, in contrast to pre-chromatography fractions. However, only a small proportion of the viral RdRp as well as numerous host proteins bound to and eluted from the resin under non-denaturing conditions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s007050050003
Permalink
