By C. Anthony (auth.), J. A. Jongejan, J. A. Duine (eds.)

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Extra resources for PQQ and Quinoproteins: Proceedings of the First International Symposium on PQQ and Quinoproteins, Delft, The Netherlands, 1988

Sample text

A. ), PQQ and Quinoproteins, 46-49. © 1989 by Kluwer Academic Publishers. 47 RESULTS AND DISCUSSION Cloning and nucleotide sequence of the reqion downstream from the MDH structural gene. , 1987). The insert of this clone was used as a hybridization probe to find additional clones linked to this region. 4 kbp in length, downstream from the MDH gene (Fig 1). Nucleotide sequence analysis of this clone revealed that downstream from the MDH gene an open reading frame (ORF-2) is located which encodes a protein of 29 kD (Fig 2).

5 mg protein/ml of quinoprotein ethanol dehydrogenase from P. aeruginosa were prepared in 100 mM Tris/HC1, 100 mM NaCl, pH 7, or the same buffer containing 10 mM CaC1 2 , respectively. Samples were incubated in small test tubes at various temperatures and after rapid cooling residual activities were determined. Isoelectric point. Isoelectric points were determined by isoelectric focussing experiments and by pH-dependent binding analysis (Yang and Langer, 1985). All other methods used have been described recently (Rupp and Gorisch, 1988).

0 to resolve the bound FAD, the resulting inactive enzyme still showed an absorption at around 340 nm. The chromophore was removed from the enzyme only by denaturation of the enzyme protein with 6 M guanidine hydrochloride; the denatured protein isolated by gel filtration with Sephadex G-25 had no absorption at 340 nm and the separated chromophore showed a spectrum with an absorption maximum at about 350 nm. These results suggest that the enzyme contains not only FAD but also a POO-like compound, which is non-covalently but strongly bound with the enzyme.

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