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Substitution of Arg-244 by Cys or Ser in SHV-1 and SHV-5 beta-lactamases confers resistance to mechanism-based inhibitors and reduces catalytic efficiency of the enzymes.
Giakkoupi P, Tzelepi E, Legakis NJ, Tzouvelekis LS. Giakkoupi P, et al. FEMS Microbiol Lett. 1998 Mar 1;160(1):49-54. doi: 10.1111/j.1574-6968.1998.tb12889.x. FEMS Microbiol Lett. 1998. PMID: 9495011
Epidemiology of metalloenzyme-producing Pseudomonas aeruginosa in a tertiary hospital in Greece.
Zappas S, Giakkoupi P, Vourli S, Hadjichristodoulou C, Polemis M, Tzouvelekis LS, Avlami A, Vatopoulos A, Daikos GL, Petrikkos G. Zappas S, et al. J Chemother. 2008 Jun;20(3):307-11. doi: 10.1179/joc.2008.20.3.307. J Chemother. 2008. PMID: 18606584
PFGE molecular typing revealed that P. aeruginosa clinical isolates sensitive to imipenem, P. aeruginosa isolates resistant to imipenem but VIM-negative, and P. aeruginosa-resistant and VIM-positive isolates could be allocated to three different clusters with …
PFGE molecular typing revealed that P. aeruginosa clinical isolates sensitive to imipenem, P. aeruginosa isolates resistant to …
Outbreak of infections due to KPC-2-producing Klebsiella pneumoniae in a hospital in Crete (Greece).
Maltezou HC, Giakkoupi P, Maragos A, Bolikas M, Raftopoulos V, Papahatzaki H, Vrouhos G, Liakou V, Vatopoulos AC. Maltezou HC, et al. J Infect. 2009 Mar;58(3):213-9. doi: 10.1016/j.jinf.2009.01.010. Epub 2009 Feb 26. J Infect. 2009. PMID: 19246099
Transferable DHA-1 cephalosporinase in Escherichia coli.
Giakkoupi P, Tambic-Andrasevic A, Vourli S, Skrlin J, Sestan-Crnek S, Tzouvelekis LS, Vatopoulos AC. Giakkoupi P, et al. Int J Antimicrob Agents. 2006 Jan;27(1):77-80. doi: 10.1016/j.ijantimicag.2005.09.013. Epub 2005 Dec 13. Int J Antimicrob Agents. 2006. PMID: 16352422
Discrepancies and interpretation problems in susceptibility testing of VIM-1-producing Klebsiella pneumoniae isolates.
Giakkoupi P, Tzouvelekis LS, Daikos GL, Miriagou V, Petrikkos G, Legakis NJ, Vatopoulos AC. Giakkoupi P, et al. J Clin Microbiol. 2005 Jan;43(1):494-6. doi: 10.1128/JCM.43.1.494-496.2005. J Clin Microbiol. 2005. PMID: 15635025 Free PMC article.
VIM-1 Metallo-beta-lactamase-producing Klebsiella pneumoniae strains in Greek hospitals.
Giakkoupi P, Xanthaki A, Kanelopoulou M, Vlahaki A, Miriagou V, Kontou S, Papafraggas E, Malamou-Lada H, Tzouvelekis LS, Legakis NJ, Vatopoulos AC. Giakkoupi P, et al. J Clin Microbiol. 2003 Aug;41(8):3893-6. doi: 10.1128/jcm.41.8.3893-3896.2003. J Clin Microbiol. 2003. PMID: 12904412 Free PMC article.
Spread of integron-associated VIM-type metallo-beta-lactamase genes among imipenem-nonsusceptible Pseudomonas aeruginosa strains in Greek hospitals.
Giakkoupi P, Petrikkos G, Tzouvelekis LS, Tsonas S, Legakis NJ, Vatopoulos AC; WHONET Greece Study Group. Giakkoupi P, et al. J Clin Microbiol. 2003 Feb;41(2):822-5. doi: 10.1128/jcm.41.2.822-825.2003. J Clin Microbiol. 2003. PMID: 12574292 Free PMC article.
Substitution of Thr for Ala-237 in TEM-17, TEM-12 and TEM-26: alterations in beta-lactam resistance conferred on Escherichia coli.
Giakkoupi P, Hujer AM, Miriagou V, Tzelepi E, Bonomo RA, Tzouvelekis LS. Giakkoupi P, et al. FEMS Microbiol Lett. 2001 Jul 10;201(1):37-40. doi: 10.1111/j.1574-6968.2001.tb10729.x. FEMS Microbiol Lett. 2001. PMID: 11445164
IBC-1, a novel integron-associated class A beta-lactamase with extended-spectrum properties produced by an Enterobacter cloacae clinical strain.
Giakkoupi P, Tzouvelekis LS, Tsakris A, Loukova V, Sofianou D, Tzelepi E. Giakkoupi P, et al. Antimicrob Agents Chemother. 2000 Sep;44(9):2247-53. doi: 10.1128/aac.44.9.2247-2253.2000. Antimicrob Agents Chemother. 2000. PMID: 10952563 Free PMC article.
Detection of extended-spectrum beta-lactamases in clinical isolates of Enterobacter cloacae and Enterobacter aerogenes.
Tzelepi E, Giakkoupi P, Sofianou D, Loukova V, Kemeroglou A, Tsakris A. Tzelepi E, et al. J Clin Microbiol. 2000 Feb;38(2):542-6. doi: 10.1128/JCM.38.2.542-546.2000. J Clin Microbiol. 2000. PMID: 10655342 Free PMC article.
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