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• W1480995917 abstract "The lipase gene, geh, from Staphylococcus aureus NCTC8530 was cloned in Staphylococcus carnosus. DNA sequencing revealed an open reading frame (ORF) of 2046 nucleotides encoding a 682-amino-acid protein with a molecular mass of 76900 Da. Determination of the transcriptional start site revealed a 203-nucleotide mRNA leader. Expression of geh in the protease-negative S. carnosus (pT181copSA22) resulted in overexpression of a 83-kDa lipase found in the culture supernatant. N-terminal protein sequencing and sequence comparison with three other staphylococcal lipases suggest that this lipase is organised as a pre-pro-enzyme. The substrate specificity of this lipase is different from the Staphylococcus hyicus lipase. The S. hyicus lipase expressed both a high Ca(2+)-dependent phospholipase and lipase activity while the S. aureus lipase lacked this phospholipase activity and its activity with tributyrylglycerol or p-nitrophenyl octanoate is hardly stimulated by Ca2+ ions. A hybrid protein was constructed in which the C-terminal 146 residues of the S. hyicus lipase were substituted by 145 residues of the C-terminal of the S. aureus lipase, which contains the proposed active-site amino acids Asp602 and His641. The hybrid enzyme was still active and revealed an intermediary enzymic activity. The most striking effect was that it had lost the S. hyicus-specific phospholipase activity and that, in contrast to the two parental enzymes, its activity with p-nitrophenyl octanoate became highly sensitive to the presence of Ca2+. These observations suggest that the C-terminal domain of the S. hyicus lipase strongly contributes to the binding pocket of the polar headgroup of phospholipids. The Ca(2+)-binding site seems to be located in the N-terminal fragment of the S. hyicus lipase. The fact that two closely related enzymes differ in the need for Ca2+ underscores the notion that it plays a structural rather than a catalytic role." @default.
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• W1480995917 date "1995-03-01" @default.
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• W1480995917 title "Comparative Biochemical and Molecular Analysis of the Staphylococcus hyicus, Staphylococcus aureus and a Hybrid Lipase. Indication for a C-Terminal Phospholipase Domain" @default.
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• W1480995917 doi "https://doi.org/10.1111/j.1432-1033.1995.0732m.x" @default.
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