کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2818113 | 1160032 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Identification of a novel isoform of DHRS4 protein with a nuclear localization signal Identification of a novel isoform of DHRS4 protein with a nuclear localization signal](/preview/png/2818113.png)
The DHRS4 gene encodes an NADP(H)-dependent retinol dehydrogenase/reductase (NRDR) and plays an important role in regulating the synthesis of retinoic acid. In the present study, we identified a novel splice RNA variant, designated NRDRA2, of the human DHRS4 gene by RT-PCR, 3′ RACE, and 5′ RACE. NRDRA2 mRNA lacked exons 4 and 6, and had a shift in the reading frame when compared to DHRS4 mRNA, resulting in loss of the peroxisomal targeting signal of NRDR and gain of a nuclear localization signal in the predicted NRDRA2 protein. Endogenous NRDRA2 protein was identified in the human cervical carcinoma cell line HeLa by immunoprecipitation and mass spectrometric assay. A green fluorescent protein reporter assay showed that NRDRA2 protein mainly localized to the nuclei, confirming the sequence at its C-terminus as a legitimate nuclear localization signal sequence. This study identifies the alternative transcript variant NRDRA2 encoding a subcellular nuclear localized NRDRA2 protein.
► NRDRA2, a novel isoform of the human DHRS4 gene, was identified in mRNA and protein.
► NRDRA2 localized in the nuclei.
► The nuclear localization signal in NRDRA2 was confirmed to be functional.
► NRDRA2 lost the catalytic activity as a retinol dehydrogenase/reductase.
Journal: Gene - Volume 494, Issue 2, 25 February 2012, Pages 161–167