Gene Sequence, Soluble Expression and Homologous Comparison of a D-Hydantoinase from Pseudomonas putida YZ-26

Abstract

Abstract: A 1440bp open-reading frame encoding D-hydantoinase from Pseudomonas putida YZ-26 was cloned and sequenced(GenBank AY387829). The DNA fragment was inserted into Nde and BamHI sites of vector pET-3a, yielding a recombinant plasmid, pET-HDT. After being transferred into the host strain, the artificial strain, pET-HDT/E.coli BL21 can express the D-hydantoinase as the soluble form in the Lura-Bertani medium without addition of any inducers. The activity of the enzyme toward substrate DL-hydantoin can reach 3000-4000 IU per cells from one-liter bacterial culture incubated at 30 ℃ for 10-12 h. By the comparison of amino acid sequence homology, hydrophobic residues analysis and secondary structure prediction, it was found that D-hydantoinase reported herein is quite similar to that from Pseudomonas putdia CCRC12857, and alike to that from Pseudomonas putdia DSM84 or other bacteria. A rapid and efficient purification procedure of the enzyme was performed by a three-step procedure: ammonium sulfate fractionation, phenyl Sepharose hydrophobic interaction chromatography and Sephacryl S-200 gel filtration. The molecular mass of the monomeric enzyme is 52042 Da as determined by MALDI-TOF mass spectrometry.

Key words: D-Hydantoinase, Gene sequence, Soluble expression, Homologous comparison, Purification, Mass spectrum

SHI Ya-wei, ZHAO Li-xia, NIU Li-xi, FENG Xia, YUAN Jing-ming. Gene Sequence, Soluble Expression and Homologous Comparison of a D-Hydantoinase from Pseudomonas putida YZ-26[J]. Chemical Research in Chinese Universities, 2005, 21(5): 552-557.

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