Expression and Antigenicity of Replicase Protein from Snow Mountain-like Caliciviruses,Korean Isolates
Journal of the Korean Society of Virology
;
: 151-160, 1997.
Article
in Korean
| WPRIM
| ID: wpr-36398
ABSTRACT
In view of the potential of replicase protein as a diagnostic reagent for human caliciviruses (HuCVs), we have cloned and over-expressed this gene from the Snow Mountain-like Korean strains in Escherichia coli as a fusion protein with glutathione S-transferase (GST, and described the preliminary antigenic characterization of the recombinant products. Each 470bp fragment corresponding to highly conserved region of RNA-dependent RNA polymerase was generated by RT-PCR from stools of two diarrheal children, cloned in pMOSBlue T-vector, and subcloned between the EcoRI and SalI restriction sites of pGEX-47-3, a GST gene fusion vector, yielding pGCVpol. This construct expressed a Snow Mountain-like HuCV replicate under the control of the IPTG-inducible pac promoter. An extract prepared by sonication of the E. coli cell inclusion bodies bearing pGCVpol products was purified and analyzed by SDS-PAGE. After Coomassie blue staining, it was shown that the recombinant replicase migrated on the gels with an approximate molecular mass of 46.5 kDa, that was subsequently cleaved into a 26 kDa GST fragment and a 20.5 kDa replicase protein upon digestion with thrombin protease. The replicase was recognized on immunoblotting with the sera from symptomatic children with the HuCV-associated diarrhea but not by asymptomatic sera from adults. The results presented the first biological activity of individually expressed HuCV replicase subunit and provided important reagents for diagnosis of HuCV infection.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Snow
/
Sonication
/
Staphylococcal Protein A
/
RNA-Dependent RNA Polymerase
/
Thrombin
/
Immunoblotting
/
Inclusion Bodies
/
Clone Cells
/
Diagnosis
/
Diarrhea
Type of study:
Diagnostic study
Limits:
Adult
/
Child
/
Humans
Language:
Korean
Journal:
Journal of the Korean Society of Virology
Year:
1997
Type:
Article
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