Purification and characterization of two putative HLA class II associated proteins: PHAPI and PHAPII.

Purification and characterization of two putative HLA class II associated proteins: PHAPI and PHAPII.
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两种假定的 HLA II 类相关蛋白:PHAPI 和 PHAPII 的纯化和表征。

DOI:
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发表时间:
1994
期刊:
Biological Chemistry Hoppe-Seyler
影响因子:
--
通讯作者:
Norbert Hilschmann
Norbert Hilschmann
中科院分区:
--
文献类型:
--
作者:
M. Vaesen;S. Barnikol;Hilde Götz;L. A. Awni;Thomas Cole;Bodo Zimmermann;Hartmut Kratzin;Norbert Hilschmann

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除了在细胞表面呈递经过加工的抗原方面具有明确的作用外,II 类分子还能够在与配体结合后将信号转导到细胞中。 II 类分子的细胞质区域可能充当尚未识别的蛋白质的对接位点,这些蛋白质是该信号传导途径的组成部分。在这里,我们报告了两种假定的 HLA II 类相关蛋白(PHAPI 和 PHAPII),它们是使用亲和基质从人淋巴母细胞 B 细胞系 H2LCL 的胞质部分中纯化出来的,该亲和基质由固定在亲和素琼脂糖上的 DR2 α 链的合成生物素化胞质区域组成。获得的 PHAPI 序列揭示了一种具有富含亮氨酸/异亮氨酸 N 末端区域的新型一级结构。获得的 PHAPII 的蛋白质数据和 cDNA 序列与最近描述的 SET 的 cDNA 序列一致。 PHAPI 和 PHAPII 均具有延伸的高酸性 C 末端区域。基于它们的一级结构,我们推测 PHAPI 和 PHAPII 参与细胞内信号传导事件的产生,这些信号传导事件在配体与 HLA II 类分子结合后导致转录活性的调节。
In addition to their well defined role in presentation of processed antigen on the cell surface, class II molecules are able to transduce signals into the cell after binding of ligands. The cytoplasmic regions of class II molecules might function as docking sites for as yet unidentified proteins that are components of this signalling pathway. Here we report on two putative HLA class II associated proteins (PHAPI and PHAPII) which have been purified from the cytosolic fraction of the human lymphoblastoid B-cell line H2LCL using an affinity matrix composed of the synthetic biotinylated cytoplasmic region of the DR2 alpha chain immobilized on avidin agarose. The sequence obtained for PHAPI revealed a novel primary structure with a leucine/isoleucine rich N-terminal region. Protein data and the cDNA sequence obtained for PHAPII agree with the cDNA sequence of SET that has been described recently. Both PHAPI and PHAPII have an extended highly acidic C-terminal region. Based on their primary structure we speculate that PHAPI and PHAPII are involved in the generation of intracellular signalling events that lead to regulation of transcriptional activity after binding of a ligand to HLA class II molecules.
通过 cAMP 或 MHC 限制性 T 细胞相互作用诱导 M12 B 淋巴瘤中的共刺激分子 B7。
DOI: --
发表时间: 1993
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Watts,TH;Alaverdi,N;Wade,WF;Linsley,PS
通讯作者: Linsley,PS
DOI: --
发表时间: 1990
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Lane,PJ;McConnell,FM;Schieven,GL;Clark,EA;Ledbetter,JA
通讯作者: Ledbetter,JA