Expression of two kinds of recombinant glutamate dehydrogenase from Aeropyrum pernix with different N-terminal sequence length in Escherichia coli.
Two recombinant Aeropyrum pernix glutamate dehydrogenase (GDH) enzymes with different length N-termini were cloned and expressed in Escherichia coli: sGDH begins with the amino acid sequence of the extracted native enzyme (M-Q-P-T-D-P-L-E-E), whereas lGDH begins with the sequence of the predicted ORF (M-E-V-L-A-L-Q-P-T-D) and is longer than sGDH by five amino acids (M-E-V-L-A). Purified recombinant lGDH was more stable than sGDH, indicating that the N-terminal extension, containing mostly hydrophobic residues, affected the overall stability of recombinant lGDH. This stabilising effect of extending the N-terminal sequence on an oligomeric enzyme such as GDH is novel; factors affecting stabilisation have previously only been discussed in the context of the contribution of internal amino acids.
Helianti
I
I
School of Materials Science, Japan Advanced Institute of Science and Technology, 1-1 Asahidai, Tatsunokuchi, Ishikawa 923-1292, Japan.
Morita
Y
Y
Murakami
Y
Y
Yokoyama
K
K
Tamiya
E
E
D000595:Amino Acid Sequence; D002942:Circular Dichroism; D003001:Cloning, Molecular; D019620:Desulfurococcaceae / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D004795:Enzyme Stability; D004926:Escherichia coli / Q000201:enzymology* / Q000235:genetics / Q000302:isolation & purification; D005969:Glutamate Dehydrogenase / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D013696:Temperature
D011994:Recombinant Proteins; D005969:Glutamate Dehydrogenase