Cloning and functional analysis of a novel aldo-keto reductase from Aloe arborescens.
A novel aldo-keto reductase (AKR) was cloned and sequenced from roots of Aloe arborescens by a combination of RT-PCR using degenerate primers based on the conserved sequences of plant polyketide reductases (PKRs) and cDNA library screening by oligonucleotide hybridization. A. arborescens AKR share similarities with known plant AKRs (40-66% amino acid sequence identity), maintaining most of the active-site residues conserved in the AKR superfamily enzymes. Interestingly, despite the sequence similarity with PKRs, recombinant enzyme expressed in Escherichia coli did not exhibit any detectable PKR activities. Instead, A. arborescens AKR catalyzed NADPH-dependent reduction of various carbonyl compounds including benzaldehyde and DL-glyceraldehyde. Finally, a homology model on the basis of the crystal structure of Hordeum vulgare AKR predicted the active-site architecture of the enzyme.
Mitsubishi Kagaku Institute of Life Sciences (MITILS).
Hiroyuki
H
Morita
Yuusuke
Y
Mizuuchi
Tsuyoshi
T
Abe
Toshiyuki
T
Kohno
Hiroshi
H
Noguchi
Ikuro
I
Abe
D000429:Alcohol Oxidoreductases / Q000096:biosynthesis / Q000235:genetics* / Q000378:metabolism*; D000449:Aldehyde Reductase; D000074408:Aldo-Keto Reductases; D000504:Aloe / Q000201:enzymology*; D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D017931:DNA Primers; D018076:DNA, Complementary / Q000096:biosynthesis / Q000235:genetics; D018744:DNA, Plant / Q000096:biosynthesis / Q000235:genetics; D015723:Gene Library; D007700:Kinetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009249:NADP / Q000378:metabolism; D009841:Oligonucleotides; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013056:Spectrophotometry, Ultraviolet
D017931:DNA Primers; D018076:DNA, Complementary; D018744:DNA, Plant; D009841:Oligonucleotides; D009249:NADP; D000429:Alcohol Oxidoreductases; D000074408:Aldo-Keto Reductases; D000449:Aldehyde Reductase