Combined Chemical-Enzymatic Assembly of Aminoglycoside Derivatives with N-1-AHB Side Chain
作者:Igor Nudelman、Lilach Chen、Nicholas M. Llewellyn、El-Habib Sahraoui、Marina Cherniavsky、Jonathan B. Spencer、Timor Baasov
DOI:10.1002/adsc.200800229
日期:2008.8.4
A series of unprotected pseudo-disaccharides and pseudo-trisaccharides of 2-deoxystreptamine-containing aminoglycosides have been selectively acylated at the N-1 position with the valuable (S)-4-amino-2-hydroxybutanoyl (AHB) pharmacophore by using the recombinant BtrH and BtrG enzymes from butirosin biosynthesis in combination with a synthetic acyl donor. The process was optimized by performing two
Nonsense mutations promote premature translational termination and represent the underlying cause of a large number of human genetic diseases. The aminoglycoside antibiotic gentamicin has the ability to allow the mammalian ribosome to read past a false-stop signal and generate full-length functional proteins. However; severe toxic side effects along with the reduced suppression efficiency at subtoxic doses limit the use of gentamicin for suppression therapy. We describe here the first systematic development of the novel aminoglycoside 2 (NB54) exhibiting superior in vitro readthrough efficiency to that of gentamicin in seven different DNA fragments derived from mutant genes carrying nonsense mutations representing the genetic diseases Usher syndrome, cystic fibrosis, Duchenne muscular dystrophy, and Hurler syndrome. Comparative acute lethal toxicity in mice, cell toxicity, and the assessment of hair cell toxicity in cochlear explants further indicated that 2 exhibits far lower toxicity than that of gentamicin.
Repairing faulty genes by aminoglycosides: Development of new derivatives of geneticin (G418) with enhanced suppression of diseases-causing nonsense mutations
New pseudo-di- and pseudo-trisaccharide derivatives of the aminoglycoside drug G418 were designed, synthesized and their ability to readthrough nonsense mutations was examined in both in vitro and ex vivo systems, along with the toxicity tests. Two novel lead structures, NB74 and NB84, exhibiting significantly reduced cell toxicity and superior readthrough efficiency than those of gentamicin, were discovered. The superiority of new leads was demonstrated in six different nonsense DNA-constructs underling the genetic diseases cystic fibrosis, Duchenne muscular dystrophy, Usher syndrome and Hurler syndrome. (C) 2010 Elsevier Ltd. All rights reserved.
Rigid spiroethers targeting the decoding center of the bacterial ribosome
Continuing our efforts towards understanding the principles governing ribosomal recognition and function, we have synthesized and evaluated a series of diversely functionalized 5,6-, 6,6- and 7,6- spiroethers. These compounds successfully mimic natural aminoglycosides regarding their binding to the decoding center of the bacterial ribosome. Their potential to inhibit prokaryotic protein production in vitro along with their antibacterial potencies have also been examined. (C) 2014 Elsevier Ltd. All rights reserved.
Novel aminoglycosides and uses thereof in the treatment of genetic disorders
申请人:Bassov Timor
公开号:US20090093418A1
公开(公告)日:2009-04-09
A new class of paromomycin-derived aminoglycosides, which exhibit efficient stop-codon mutation suppression activity, low toxicity and high selectivity towards eukaryotic cells are provided. Also provided are chemical and chemo-enzymatic processes of preparing these paromomycin-derived aminoglycosides and intermediates thereof, as well as pharmaceutical compositions containing the same, and uses thereof in the treatment of genetic disorders.