Martens C L, Huff T F, Jardieu P, Trounstine M L, Coffman R L, Ishizaka K, Moore K W
Proc Natl Acad Sci U S A. 1985 Apr;82(8):2460-4. doi: 10.1073/pnas.82.8.2460.
cDNA clones encoding rodent IgE-binding factors (IgE-BF) were isolated from cDNA libraries of a rat-mouse T hybridoma that secretes IgE-suppressive factor (IgE-SF) upon incubation with rat IgE. COS7 cells transfected with two of the cDNAs expressed IgE-BF, which selectively potentiate an in vitro IgE response. IgE-BF expressed in COS7 cells are glycoproteins of approximately equal to 60 and approximately equal to 11 kDa. DNA sequence analysis of an IgE-BF cDNA revealed a 556-amino acid (62 kDa) protein coding region. The results suggest that IgE-potentiating and IgE-suppressive factors share common precursor polypeptides and that the 11-kDa IgE-BF is derived from a 60-kDa precursor.
从大鼠 - 小鼠T杂交瘤的cDNA文库中分离出编码啮齿动物IgE结合因子(IgE - BF)的cDNA克隆,该杂交瘤在与大鼠IgE孵育时分泌IgE抑制因子(IgE - SF)。用其中两个cDNA转染的COS7细胞表达IgE - BF,其选择性增强体外IgE反应。在COS7细胞中表达的IgE - BF是约60 kDa和约11 kDa的糖蛋白。对IgE - BF cDNA的DNA序列分析揭示了一个556个氨基酸(62 kDa)的蛋白质编码区。结果表明,IgE增强因子和IgE抑制因子共享共同的前体多肽,并且11 kDa的IgE - BF源自60 kDa的前体。