Characterization and Antiviral Effects of Mx Proteins from Various MHC Haplotype Chickens Showing Different Susceptible to Marek's Disease Virus

  • Chang, Kyuug-Soo (Department of Clinical Laboratory Science, College of Health Science, Catholic University of Pusan)
  • Received : 2010.10.09
  • Accepted : 2010.12.27
  • Published : 2010.12.31

Abstract

Chicken Mx protein (cMx) induced interferon (IFN) is an antiviral protein to inhibit replication of RNA virus, particularly negative stranded RNA virus, through blockage of transfortation of viral RNA and proteins. In order to determine antiviral effects of cMx from different MHC haplotype chicken, we characterized cMx gene by studying on nucleotide sequencing, antiviral effects to Newcastle disease virus, VSV and MDV, and transcription activities. Three types of eMx genes (2,118 bp) were detected from the different MHC haplotype chickens [B19 (N), B15(F) and B21 (GSP)] chickens, which have showed different susceptible to Marek's disease (MD). Several amino acid substitutions were showed in the cMx. The amino acid 548 and 631 in the cMxs from N and F, chickens susceptible to MD, was Val and Asn which was important on antiviral effects, and showed in resistant cMx. Those in the cMx from GSP, chicken resistant to MD, were same that showed in susceptible cMx. Though every cMx transactivated the expression of the reporter gene, the transcription activation by resistant cMx from N and F was lower compared to that by susceptible cMx from GSP. The decease of the cell growth in the resistant cMx cloned cells was seen in comparison with another cMx clone cells. Replication of NDV and VSV was suppressed in the clones with resistant cMx from N and F. NMx258-transducted cells lack of antiviral effects, and NMx437 or NMx646-transducted cells was showed 60% of antiviral effects compared to NMx705. Mean death time (MDT) and hemaggutination (HA) titer to NDV was long and low in the eggs of N and F lines, but short and high in the egg of GSP line. Interestingly, strong suppression to NDV was observed in the clone with N-Mx and in the eggs of N line. However, the effects of Mx for replication of vvMDV1 have not been. Thus, resistant types of cMx, N- and F-Mx, have showed the anti-viral effects to only RNA virus including NDV and VSV, but not to DNA virus. Antiviral effects of cMx were required whole length of amino acid including Val and Asn in amino acid 548 and 631.

Keywords

References

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