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Heterologous expression of Translocated promoter region protein, Tpr, identified as a transcription factor from Rattus norvegicus.

Abstract：

:Our earlier studies have demonstrated that the 35 kDa isoform of Translocated promoter region protein (Tpr) of Rattus norvegicus was able to augment c-jun transcription efficiently. Identification of direct targets that may in part downregulate c-jun transcription might prove to be an ideal target to curtail the proliferation of normal cells under pathophysiological conditions. In order to evaluate its potential as a pharmaceutical target, the protein must be produced and purified in sufficiently high yields. In the present study, we report the high level expression of Tpr protein of R. norvegicus employing heterologous host, Escherichia coli, to permit its structural characterization in great detail. We here demonstrate that the Tpr protein was expressed in soluble form and approximately 90 mg/L of the purified protein at the shake flask level could be achieved to near homogeneity using single step-metal chelate affinity chromatography. The amino acid sequence of the protein was confirmed by mass spectroscopic analysis. The highly unstable and disordered Tpr protein was imparted structural and functional stability by the addition of glycerol and it has been shown that the natively unfolded Tpr protein retains DNA binding ability under these conditions only. Thus, the present study emphasizes the significance of an efficient prokaryotic system, which results in a high level soluble expression of a DNA binding protein of eukaryotic origin. Thus, the present strategy employed for purification of the R. norvegicus Tpr protein bypasses the need for the tedious expression strategies associated with the eukaryotic expression systems.

journal_name

Protein Expr Purif

journal_title

Protein expression and purification

authors

Agarwal S,Yadav SK,Dixit A

doi

10.1016/j.pep.2011.01.001

subject

Has Abstract

pub_date

2011-05-01 00:00:00

pages

112-7

issue

1

eissn

1046-5928

issn

1096-0279

pii

S1046-5928(11)00002-7

journal_volume

77

pub_type

杂志文章

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