PMID: 9425112Feb 28, 1998Paper

Identification of nine interferon-alpha subtypes produced by Sendai virus-induced human peripheral blood leucocytes

The Biochemical Journal
T A NymanN Kalkkinen

Abstract

The human interferon-alpha (IFN-alpha) family is encoded by 13 different functional genes, and including all cloned sequence variants there are 28 potential IFN-alpha proteins. To find out which of the described sequences are expressed in normal human leucocytes, we have isolated and partly characterized the components of a highly purified IFN-alpha preparation produced by Sendai virus-induced human peripheral blood leucocytes. The identification protocol consisted of N-terminal sequencing and mass mapping of the proteins separated by reverse-phase HPLC and/or SDS/PAGE. The highly purified leucocyte IFN-alpha preparation was found to contain at least nine different IFN-alpha species: IFN-alpha1a, IFN-alpha2b, IFN-alpha4b, IFN-alpha7a, IFN-alpha8b, IFN-alpha10a, IFN-alpha14c, IFN-alpha17b and IFN-alpha21b. IFN-alpha1a was the major subtype, comprising approx. 30% of total leucocyte IFN-alpha. IFN-alpha14c, the only subtype containing potential N-glycosylation sites, was shown to be glycosylated at Asn-72. Molecular mass determination of the intact proteins by electrospray ionization MS showed that there are no other post-translational modifications in the IFN-alpha subtypes than the glycosylation of IFN-alpha2b and IFN-alpha14c....Continue Reading

Citations

Apr 16, 2013·Biomedicine & Pharmacotherapy = Biomédecine & Pharmacothérapie·G SantakD Forčić
Jul 5, 2007·FEMS Immunology and Medical Microbiology·Zhongyi CongYongli Yu
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