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• W2023843372 abstract "The product of the gene ponA present in cosmid MTCY21D4, one of the collection of clones representing the genome of Mycobacterium tuberculosis, has been named penicillin-binding protein 1* (PBP1*), by analogy to the previously characterized PBP1* of M. leprae. This gene has been overexpressed in Escherichia coli. His(6)-tagged PBP1* localizes to the membranes of induced E. coli cells. Its susceptibility to degradation upon proteinase K digestion of spheroplasts from E. coli expressing the protein supports the view that the majority of the protein translocates to the periplasmic side of the membrane. Recombinant PBP1* binds benzylpenicillin and several other beta-lactams, notably cefotaxime, with high affinity. Truncation of the N-terminal 64 amino acid residues results in an expressed protein present exclusively in inclusion bodies and unable to associate with the membrane. The C-terminal module encompassing amino acids 272-663 can be extracted from inclusion bodies under denaturing conditions using guanidine/HCl and refolded to give a protein fully competent in penicillin-binding. Deletion of Gly(95)-Gln(143) results in the expression of a protein, which is localized in the cytosol. The soluble derivative of PBP1* binds benzylpenicillin with the same efficiency as the full-length protein. This is the first report of a soluble derivative of a class A high-molecular-mass PBP." @default.
• W2023843372 created "2016-06-24" @default.
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• W2023843372 date "2002-02-01" @default.
• W2023843372 modified "2023-10-16" @default.
• W2023843372 title "Overexpression, purification and biochemical characterization of a class A high-molecular-mass penicillin-binding protein (PBP), PBP1* and its soluble derivative from Mycobacterium tuberculosis" @default.
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• W2023843372 doi "https://doi.org/10.1042/0264-6021:3610635" @default.
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