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Cloning and expression of a new human polypeptide which regulates protein phosphorylation in Escherichia coli

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Summary

A 1,820bp full-length clone encoding for a new human protein was isolated from a λgt11 placental cDNA library using anti-human hexokinase antibodies. The cDNA complete sequence includes a 12 by 5′ noncoding region, a single open reading frame encoding a protein of 55 KDa (HP-10) and a 177 by non-coding with two putative polyadenylation signals upstream of 3′poly(A)tail. The deduced amino acid sequence reveals a sequence of 492 amino acids that contains a stretch of 7 glutamic acid from position 169 and one potential glycosylation site at position 274. Although antibodies against hexokinase recognize the fusion protein and antibodies against the fusion protein recognize hexokinase, HP-10 is not human hexokinase, by a number of criteria including the alignment of determined amino acid sequences.

In searching for a possible functional role of HP-10 its cDNA was inserted into a procaryotic vector which allows the expression of the non-fused protein. Bacteria expressing the HP-10 encoded protein were isolated and found to have a dramatic increase in endogenous phosphorylated proteins. Since HP-10 does not have a protein kinase activity per se it should be considered a new regulatory phosphorylation protein which is active in E. coli

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Abbreviations

HK:

Hexokinase (EC 2.7.1.1)

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Daniele, A., Altruda, F., Ferrone, M. et al. Cloning and expression of a new human polypeptide which regulates protein phosphorylation in Escherichia coli. Mol Cell Biochem 107, 87–94 (1991). https://doi.org/10.1007/BF00225511

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