title: Stabilisation of purified human collagenase by site-directed mutagenesis.
abstract: During purification, human fibroblast collagenase breaks down into two major forms, an N-terminal 22000/25000-Mr fragment and a C-terminal 27000-Mr fragment; the most likely mechanism being autolysis. The cleavage site has been identified (Pro269- Ile270) and in an attempt to obtain full-length human collagenase (i.e., Mr 42570), this cleavage site and another potential cleavage site (Ala258- Ile259) have been mutated by PCR- directed mutagenesis: Ile270Ser and Ile259Leu. The mutated cDNA was then cloned into the expression vector, pGEX2T, and expressed in Escherichia coli as a fusion protein with glutathione-S-transferase (GST). After cleavage with factor Xa, the mutated collagenase was purified on a peptide hydroxamic acid affinity column. The mutated recombinant collagenase is stable, remains full length and retains the ability to cleave collagen.
mesh_terms: D000409:Alanine; D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D017364:Collagenases / Q000096:biosynthesis / Q000737:chemistry* / Q000378:metabolism*; D017931:DNA Primers; D018076:DNA, Complementary; D004591:Electrophoresis, Polyacrylamide Gel; D004795:Enzyme Stability; D004926:Escherichia coli; D005982:Glutathione Transferase / Q000096:biosynthesis; D006801:Humans; D007532:Isoleucine; D008969:Molecular Sequence Data; D008970:Molecular Weight; D016297:Mutagenesis, Site-Directed; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D011392:Proline; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000302:isolation & purification; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000737:chemistry / Q000378:metabolism
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; D011993:Recombinant Fusion Proteins; D011994:Recombinant Proteins; D007532:Isoleucine; D011392:Proline; D005982:Glutathione Transferase; D017364:Collagenases; D000409:Alanine