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J. Virol., 05 1996, 3258-3263, Vol 70, No. 5
H Hasegawa, Y Utsunomiya, K Kishimoto, K Yanagisawa and S Fujita
A novel cellular gene termed SFA-1 was isolated by differential
hybridization of a cDNA library, using probes obtained from an adult T-
cell leukemia cell line in comparison with probes obtained from normal CD4+
T cells and the MOLT-4 cell line. The mRNA of the SFA-1 gene is
approximately 1.6 kb in size and encodes a protein of 253 amino acids,
containing four putative transmembrane domains, a number of cysteine
residues, and one potential N-glycosylation site in a major hydrophilic
region between the third and fourth transmembrane domains. Expression of
the SFA-1 gene was either absent or present at a low level in lymphoid
cells but was up-regulated after transformation by human T- cell leukemia
virus type 1 and transactivated by Tax. SFA-1 was broadly expressed in many
human cell types and conserved in different species. Computer-aided
comparison showed that SFA-1 had significant sequence homology and common
structural features with members of the transmembrane 4 superfamily. SFA-1
antigen was detected as a 29-kDa membrane protein by immunoblotting, using
anti-SFA-1 monoclonal antibody.
Copyright © 1996, American Society for Microbiology
SFA-1, a novel cellular gene induced by human T-cell leukemia virus type 1, is a member of the transmembrane 4 superfamily [published erratum appears in J Virol 1997 Feb;71(2):1737]
First Department of Internal Medicine, Ehime University School of Medicine, Shigenobu, Japan.
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