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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Cloning of a coproporphyrinogen oxidase promoter regulatory element binding protein.

Coproporphyrinogen oxidase [ CPO] gene promoter regulatory element (CPRE) plays an important role in CPO gene regulation. To isolate a CPRE binding protein, we performed Southwestern screening of K562 cDNA expression library using CPRE as a probe and isolated a cDNA clone which encoded a novel protein, Klp1 (K562 cell-derived leucine-zipper-like protein 1). Klp1 mRNA was highly expressed in K562 cells, HeLa cells, and brain as a single transcript (1.4 kb). Gel mobility shift assays revealed that Klp1 specifically binds to CPRE. Computational analysis revealed that Klp1 has a leucine-zipper-like structure, a Leu-X-X-Leu-Leu motif, and a putative nuclear localization signal in the basic amino acid rich region. Transfection of the Klp1 expression vector into THP-1 cells resulted in transcriptional activation of a reporter construct containing CPRE. These results indicate that Klp1 is a DNA sequence-specific transcription factor that regulates gene expression of genes that contain CPRE in their regulatory region.[1]

References

  1. Cloning of a coproporphyrinogen oxidase promoter regulatory element binding protein. Takahashi, S., Furuyama, K., Kobayashi, A., Taketani, S., Harigae, H., Yamamoto, M., Igarashi, K., Sasaki, T., Hayashi, N. Biochem. Biophys. Res. Commun. (2000) [Pubmed]
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