Expression of active iron regulatory factor from a full length human cDNA by in vitro transcription/translation (original) (raw)
Journal Article
Swiss Institute for Experimental Cancer Research, Genetics Unit
CH-1066 Epalinges, Switzerland
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Swiss Institute for Experimental Cancer Research, Genetics Unit
CH-1066 Epalinges, Switzerland
Search for other works by this author on:
Swiss Institute for Experimental Cancer Research, Genetics Unit
CH-1066 Epalinges, Switzerland
Search for other works by this author on:
Swiss Institute for Experimental Cancer Research, Genetics Unit
CH-1066 Epalinges, Switzerland
Search for other works by this author on:
Swiss Institute for Experimental Cancer Research, Genetics Unit
CH-1066 Epalinges, Switzerland
Search for other works by this author on:
Swiss Institute for Experimental Cancer Research, Genetics Unit
CH-1066 Epalinges, Switzerland
* To whom correspondence should be addressed
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Received:
11 November 1991
Accepted:
06 December 1991
Published:
11 January 1992
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Harald Hirling, Alice Emery-Goodman, Nancy Thompson, Barbara Neupert, Christian Seiser, Lukas C. Kühn, Expression of active iron regulatory factor from a full length human cDNA by in vitro transcription/translation , Nucleic Acids Research, Volume 20, Issue 1, 11 January 1992, Pages 33–39, https://doi.org/10.1093/nar/20.1.33
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Abstract
Iron regulatory factor (IRF), also called iron responsive element-binding protein (IRE-BP), is a cytoplasmic RNA-binding protein which regulates post-transcriptionally transferrin receptor mRNA stability and ferritin mRNA translation. By using the polymerase chain reaction (PCR) and the sequence published by Rouault et al. (1990) a probe was derived which permitted the isolation of three human IRF cDNA clones. Hybridization to genomic DNA and mRNA, as well as sequencing data indicated a single copy gene of about 40 kb specifying a 4.0 kb mRNA that translates into a protein of 98, 400 dalton. By in vitro transcription of a assembled DRF cDNA coupled to in vitro translation in a wheat germ extract, we obtained full sized DRF that bound specifically to a human ferritin IRE. in vitro translated DRF retained sensitivity to sulfhydryl oxidation by diamide and could be reactivated by β-mercaptoethanol in the same way as native placental IRF. An IRF deletion mutant shortened by 132 amino acids at the COOH-terminus was no longer able to bind to an IRE, indicating that this region of the protein plays a role in RNA recognition. Placental DRF has previously been shown to migrate as a doublet on SDS-polyacrylamide gels. After V8 protease digestion the heterogeneity was located in a 65/70 kDa NH 2 -terminal doublet. The liberated 31 kDa COOH-terminal polypeptide was found to be homogeneous by amino acid sequencing supporting the conclusion of a single IRF gene.
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© 1992 Oxford University Press
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