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Structural and functional homology between duck and chicken interferon-gamma.

Abstract：

:The Duck interferon gamma (DuIFN-gamma) cDNA was cloned from a phytohaemaglutinin-stimulated duck spleen cDNA library screened using a chicken IFN-gamma (ChIFN-gamma) cDNA probe. The DuIFN-gamma cDNA is 1392 nt long and shows 99% and 80% sequence identity with another cloned DuIFN-gamma cDNA, and with ChIFN-gamma cDNA, respectively. The cDNA contains a 495 bp ORF that encodes a putative 164 amino acid (AA) protein that shares 67% identity with ChIFN-gamma, but only 30-35% identity with mammalian IFN-gamma. The predicted three-dimensional (3D) structures of DuIFN-gamma and ChIFN-gamma are similar when analysed by comparative protein modelling. Culture supernatant collected from COS cells transfected with DuIFN-gamma cDNA was able to activate nitrite secretion from a chicken macrophage cell line (HD11) in a dose-dependent fashion. This activity could not be neutralised by an anti-ChIFN-gamma monoclonal antibody (Mab 85) that was able to neutralise the activity of ChIFN-gamma. Recombinant DuIFN-gamma (rDuIFN-gamma) protein was expressed in E. coli as an N-terminally His-tagged protein and was purified on a nickel affinity column. The eluted protein, which was detected as a approximately 18 kDa band with a purity of >90%, was also detected by Western blot using the anti-ChIFN-gamma monoclonal antibody (Mab 9.1). The rDuIFN-gamma was shown to activate nitrite secretion by HD11 cells in a dose-dependent fashion with a specific activity that was approximately 16-fold lower than a rChIFN-gamma control. Two rabbit antisera raised against rDuIFN-gamma were able to neutralise COS cell-expressed DuIFN-gamma activity; one of these also neutralised ChIFN-gamma activity. These findings indicate that DuIFN-gamma shares structural and functional identity with ChIFN-gamma, which is consistent with our previous results which demonstrated cross reactivity with other lymphokines from the two species.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Huang A,Scougall CA,Lowenthal JW,Jilbert AR,Kotlarski I

doi

10.1016/s0145-305x(00)00041-0

keywords:

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

55-68

issue

1

eissn

0145-305X

issn

1879-0089

pii

S0145-305X(00)00041-0

journal_volume

25

pub_type

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