METHOD OF REMOVING N-TERMINAL ALANINE RESIDUES FROM POLYPEPTIDES WITH AEROMONAS AMINOPEPTIDASE

This invention describes a method of removing N-terminal alanine residues fr om polypeptides, preferably recombinant proteins, using an aminopeptidase deriv ed from the marine bacterium Aeromonas proteolytica. Accordingly, Aeromonas aminopeptidase (AAP; E.C. 3.4.11.10) can be used to remove N-termin...

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Hauptverfasser:	TAYLOR, DOUGLAS W, TOU, JACOB S
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	BEER BIOCHEMISTRY CHEMISTRY ENZYMOLOGY FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE METALLURGY MICROBIOLOGY MUTATION OR GENETIC ENGINEERING ORGANIC CHEMISTRY PEPTIDES SPIRITS VINEGAR WINE
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Beschreibung
Zusammenfassung:	This invention describes a method of removing N-terminal alanine residues fr om polypeptides, preferably recombinant proteins, using an aminopeptidase deriv ed from the marine bacterium Aeromonas proteolytica. Accordingly, Aeromonas aminopeptidase (AAP; E.C. 3.4.11.10) can be used to remove N-terminal alanyl residues from derivatives of human somatotropin (hST, human growth hormone, or hGH), porcine somatotropin (pST), and bovine somtotropin (bST), for example, to yield proteins having their native amino acid sequences. The enzyme reactions can be carried out in free solution, or the AAP can be immobilized on a solid support, for reactions carried out in vitro. An efficient method for converting Ala-hGH to hGH, for example, comprises expression of Ala-hGH in E. coli, recovery of inclusion bodies, solubilization and refolding in detergent, detergent removal by ultrafiltration, selective precipitation, enzyme cleavage, followed by two column chromatography steps.