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Expression, purification, and characterization of His-tagged human mitochondrial 2,4-dienoyl-CoA reductase.

Abstract：

:Mitochondrial 2,4-dienoyl-CoA reductase is a key enzyme for the beta-oxidation of unsaturated fatty acids. The cDNA of the full-length human mitochondrial 2,4-dienoyl-CoA reductase was previously cloned as pUC18::DECR. PCR methodologies were used to subclone the genes encoding various truncated human mitochondrial 2,4-dienoyl-CoA reductases from pUC18::DECR with primers that were designed to add six continuous histidine codons to the 3' or 5' primer. The PCR products were inserted into pLM1 expression vectors and overexpressed in Escherichia coli. A highly active truncated soluble protein was expressed and purified with a nickel HiTrap chelating metal affinity column to apparent homogeneity based on Coomassie blue-stained SDS-PAGE. The molecular weight of the protein subunit was 34 kDa. The purified protein is highly stable at room temperature, which makes it potentially valuable for protein crystallization. KM of 26.5 +/- 3.8 microM for 2,4-hexadienoyl-CoA, KM of 6.22 +/- 2.0 microM for 2,4-decadienoyl-CoA, and KM of 60.5 +/- 19.7 microM for NADPH, as well as Vmax of 7.78 +/- 1.08 micromol/min/mg for 2,4-hexadienoyl-CoA and Vmax of 0.74 +/- 0.07 micromol/min/mg for 2,4-decadienoyl-CoA were determined on kinetic study of the purified protein. The one-step purification of the highly active human mitochondrial 2,4-dienoyl-CoA reductase will greatly facilitate further investigation of this enzyme through site-directed mutagenesis and enzyme catalyzed reactions with substrate analogs as well as protein crystallization for solving its three-dimensional structure.

journal_name

Protein Expr Purif

journal_title

Protein expression and purification

authors

Chu X,Yu W,Chen G,Li D

doi

10.1016/s1046-5928(03)00191-8

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

292-7

issue

2

eissn

1046-5928

issn

1096-0279

pii

S1046592803001918

journal_volume

31

pub_type

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