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10.1021/bi501121e http://scihub22266oqcxt.onion/10.1021/bi501121e C4230324!4230324!25299801     free     free     free Warning: file_get_contents(https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&id=25299801&cmd=llinks): Failed to open stream: HTTP request failed! 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BlmB and TlmB Provide Resistance to the Bleomycin Family of Antitumor Antibiotics by N-Acetylating Metal-Free Bleomycin, Tallysomycin, Phleomycin, and Zorbamycin |pdf=|usr=}}{{25299801}} gab.com Text BlmB and TlmB Provide Resistance to the Bleomycin Family of Antitumor Antibiotics by N-Acetylating Metal-Free Bleomycin, Tallysomycin, Phleomycin, and Zorbamycin JO: Biochemistry http://www.kidney.de/pget.php?&tw=1&pmid=25299801 #FOAvip The bleomycin (BLM) family of glycopeptide-derived antitumor antibiotics consists of BLMs, tallysomycins (TLMs), phleomycins (PLMs), and zorbamycin (ZBM). The self-resistant elements BlmB and TlmB, discovered from the BLM- and TLM-producing organisms Streptomyces verticillus ATCC15003 and Streptoalloteichus hindustanus E465-94 ATCC31158, respectively, are N-acetyltransferases that provide resistance to the producers by disrupting the metal-binding domain of the antibiotics required for activity. Although each member of the BLM family of antibiotics possesses a conserved metal-binding domain, the structural differences between each member, namely, the bithiazole moiety and C-terminal amine of BLMs, have been suggested to instill substrate specificity within BlmB. Here we report that BlmB and TlmB readily accept and acetylate BLMs, TLMs, PLMs, and ZBM in vitro but only in the metal-free forms. Kinetic analysis of BlmB and TlmB reveals there is no strong preference or rate enhancement for specific substrates, indicating that the structural differences between each member of the BLM family play a negligible role in substrate recognition, binding, or catalysis. Intriguingly, the zbm gene cluster from Streptomyces flavoviridis ATCC21892 does not contain an N-acetyltransferase, yet ZBM is readily acetylated by BlmB and TlmB. We subsequently established that S. flavoviridis lacks the homologue of BlmB and TlmB, and ZbmA, the ZBM-binding protein, alone is sufficient to provide ZBM resistance. We further confirmed that BlmB can indeed confer resistance to ZBM in vivo in S. flavoviridis, introduction of which into wild-type S. flavoviridis further increases the level of resistance. Twit Text FOAVip BlmB and TlmB Provide Resistance to the Bleomycin Family of Antitumor Antibiotics by N-Acetylating Metal-Free Bleomycin, Tallysomycin, Phleomycin, and Zorbamycin ????Biochemistry http://www.kidney.de/pget.php?&tw=1&pmid=25299801 #FOAvip Twit Text # Free Paper on # # # # # LINK http://www.kidney.de/pget.php?&tw=1&pmid=25299801 #FOAvip English Wikipedia <ref>{{Cite pmid|25299801}}</ref> BlmB and TlmB Provide Resistance to the Bleomycin Family of Antitumor Antibiotics by N-Acetylating Metal-Free Bleomycin, Tallysomycin, Phleomycin, and Zorbamycin #MMPMID25299801 Coughlin JM; Rudolf J; Wendt-Pienkowski E; Wang L; Unsin C; Galm U; Yang D; Tao M; Shen B Biochemistry 2014[Nov]; 53 (44): 6901-9 PMID25299801show ga The bleomycin (BLM) family of glycopeptide-derived antitumor antibiotics consists of BLMs, tallysomycins (TLMs), phleomycins (PLMs), and zorbamycin (ZBM). The self-resistant elements BlmB and TlmB, discovered from the BLM- and TLM-producing organisms Streptomyces verticillus ATCC15003 and Streptoalloteichus hindustanus E465-94 ATCC31158, respectively, are N-acetyltransferases that provide resistance to the producers by disrupting the metal-binding domain of the antibiotics required for activity. Although each member of the BLM family of antibiotics possesses a conserved metal-binding domain, the structural differences between each member, namely, the bithiazole moiety and C-terminal amine of BLMs, have been suggested to instill substrate specificity within BlmB. Here we report that BlmB and TlmB readily accept and acetylate BLMs, TLMs, PLMs, and ZBM in vitro but only in the metal-free forms. Kinetic analysis of BlmB and TlmB reveals there is no strong preference or rate enhancement for specific substrates, indicating that the structural differences between each member of the BLM family play a negligible role in substrate recognition, binding, or catalysis. Intriguingly, the zbm gene cluster from Streptomyces flavoviridis ATCC21892 does not contain an N-acetyltransferase, yet ZBM is readily acetylated by BlmB and TlmB. We subsequently established that S. flavoviridis lacks the homologue of BlmB and TlmB, and ZbmA, the ZBM-binding protein, alone is sufficient to provide ZBM resistance. We further confirmed that BlmB can indeed confer resistance to ZBM in vivo in S. flavoviridis, introduction of which into wild-type S. flavoviridis further increases the level of resistance. äBlmB and TlmB Provide Resistance to the Bleomycin Family of Antitumor (epmc).pdf DeepDyve Pubget Overpricing