An N- and C-terminal truncated isoform of zinc finger X-linked duplicated C protein represses MHC class II transcription.

An N- and C-terminal truncated isoform of zinc finger X-linked duplicated C protein represses MHC class II transcription.
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DOI:
10.1007/s11010-009-0280-5
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发表时间:
2010-04
影响因子:
4.3
通讯作者:
Fontes, Joseph D.
Fontes, Joseph D.
中科院分区:
生物学3区
文献类型:
--
作者:
Aleksandrova, Anastasiia;Galkin, Oleksandr;Koneni, Rupa;Fontes, Joseph D.

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锌指X连锁重复A(ZXDA)和ZXDC蛋白都是主要组织相容性复合体II类(MHC II)基因稳健转录所需的。除了全长ZXDC mRNA转录物之外,ZXDC基因还产生至少一种另外的mRNA,其中转录起始于第一外显子内并终止于第七内含子内。从该转录物产生的蛋白质产物,我们将其命名为ZXDC 2,在N-和C-末端都被截短。我们在这里证明ZXDC 2的功能是抑制用IFN-γ处理的HeLa细胞中诱导的MHC II转录。我们进一步证明,ZXDC 2与ZXDA和ZXDC相互作用,表明ZXDC 2可能抑制MHC II转录的机制。这些研究不仅为ZXD蛋白在调节MHC II转录中的作用提供了额外的支持,而且证明了mRNA同种型合成的独特机制。
The zinc finger X-linked duplicated A (ZXDA) and ZXDC proteins are both required for robust transcription of major histocompatibility complex class II (MHC II) genes. Aside from the full length ZXDC mRNA transcript, at least one additional mRNA is produced by the ZXDC gene, in which transcription initiates within the first exon and terminates within the seventh intron. The protein product produced from this transcript, which we have named ZXDC2, is truncated on both the N- and C-terminus. We demonstrate here that ZXDC2 functions to repress MHC II transcription induced in HeLa cells treated with IFN-γ. We further demonstrate that ZXDC2 interacts with both ZXDA and ZXDC, suggesting a mechanism by which ZXDC2 may inhibit MHC II transcription. These studies not only provide additional support for the role of ZXD proteins in regulating MHC II transcription, but demonstrate a unique mechanism for the synthesis of a mRNA isoform.
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