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Article: Cloning and characterization of a chromosomal class C β-lactamase and its regulatory gene in Laribacter hongkongensis
Title | Cloning and characterization of a chromosomal class C β-lactamase and its regulatory gene in Laribacter hongkongensis |
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Authors | |
Issue Date | 2005 |
Publisher | American Society for Microbiology. |
Citation | Antimicrobial Agents And Chemotherapy, 2005, v. 49 n. 5, p. 1957-1964 How to Cite? |
Abstract | Laribacter hongkongensis, a newly discovered bacterium recently shown to be associated with community-acquired gastroenteritis, is generally resistant to most β-lactams except the carbapenems. We describe the cloning and characterization of a novel chromosomal class C β-lactamase and its regulatory gene in L. hongkongensis. Two genes, ampC and ampR, were cloned by inserting restriction fragments of genomic DNA from L. hongkongensis strain HLHK5 into pBK-CMV to give the recombinant plasmid pBK-LHK-5. The ampR and ampC genes and their promoters were divergently oriented, with the ampR gene immediately upstream of the ampC gene and an intercistronic Lys-R motif, typical of inducible ampC-ampR regulatory systems. The deduced amino acid sequence of the cloned AmpC β-lactamase (pi 8.1) contained consensus motifs characteristic of class C β-lactamases but had identities no greater than 46% to known class C β-lactamases. The kinetic properties of this AmpC were also compatible with those of a class C β-lactamase. PCR of 20 clinical isolates of L. hongkongensis, including HLHK5, showed the presence of both ampC and ampR genes in all isolates. Southern hybridization suggested that the ampC gene of HLHKS was chromosomally encoded. Subcloning experiments showed that the expression of the ampC gene of HLHK5 was regulated by its ampR gene, which acts as a repressor. The β-lactamase characterized from strain HLHK5 was named LHK-5 (gene, blaLHK-5) and represents the first example of AmpC β-lactamase in the β subdivision of proteobacteria. Copyright © 2005, American Society for Microbiology. All Rights Reserved. |
Persistent Identifier | http://hdl.handle.net/10722/79251 |
ISSN | 2023 Impact Factor: 4.1 2023 SCImago Journal Rankings: 1.357 |
PubMed Central ID | |
ISI Accession Number ID | |
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lau, SKP | en_HK |
dc.contributor.author | Ho, PL | en_HK |
dc.contributor.author | Li, MWS | en_HK |
dc.contributor.author | Tsoi, HW | en_HK |
dc.contributor.author | Yung, RWH | en_HK |
dc.contributor.author | Woo, PCY | en_HK |
dc.contributor.author | Yuen, KY | en_HK |
dc.date.accessioned | 2010-09-06T07:52:25Z | - |
dc.date.available | 2010-09-06T07:52:25Z | - |
dc.date.issued | 2005 | en_HK |
dc.identifier.citation | Antimicrobial Agents And Chemotherapy, 2005, v. 49 n. 5, p. 1957-1964 | en_HK |
dc.identifier.issn | 0066-4804 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/79251 | - |
dc.description.abstract | Laribacter hongkongensis, a newly discovered bacterium recently shown to be associated with community-acquired gastroenteritis, is generally resistant to most β-lactams except the carbapenems. We describe the cloning and characterization of a novel chromosomal class C β-lactamase and its regulatory gene in L. hongkongensis. Two genes, ampC and ampR, were cloned by inserting restriction fragments of genomic DNA from L. hongkongensis strain HLHK5 into pBK-CMV to give the recombinant plasmid pBK-LHK-5. The ampR and ampC genes and their promoters were divergently oriented, with the ampR gene immediately upstream of the ampC gene and an intercistronic Lys-R motif, typical of inducible ampC-ampR regulatory systems. The deduced amino acid sequence of the cloned AmpC β-lactamase (pi 8.1) contained consensus motifs characteristic of class C β-lactamases but had identities no greater than 46% to known class C β-lactamases. The kinetic properties of this AmpC were also compatible with those of a class C β-lactamase. PCR of 20 clinical isolates of L. hongkongensis, including HLHK5, showed the presence of both ampC and ampR genes in all isolates. Southern hybridization suggested that the ampC gene of HLHKS was chromosomally encoded. Subcloning experiments showed that the expression of the ampC gene of HLHK5 was regulated by its ampR gene, which acts as a repressor. The β-lactamase characterized from strain HLHK5 was named LHK-5 (gene, blaLHK-5) and represents the first example of AmpC β-lactamase in the β subdivision of proteobacteria. Copyright © 2005, American Society for Microbiology. All Rights Reserved. | en_HK |
dc.language | eng | en_HK |
dc.publisher | American Society for Microbiology. | en_HK |
dc.relation.ispartof | Antimicrobial Agents and Chemotherapy | en_HK |
dc.rights | Antimicrobial Agents and Chemotherapy. Copyright © American Society for Microbiology. | en_HK |
dc.subject.mesh | Proteobacteria - enzymology - genetics | - |
dc.subject.mesh | Beta-Lactamases - chemistry - genetics | - |
dc.subject.mesh | Amino Acid Sequence | - |
dc.subject.mesh | DNA, Bacterial - genetics | - |
dc.subject.mesh | Drug Resistance, Bacterial | - |
dc.title | Cloning and characterization of a chromosomal class C β-lactamase and its regulatory gene in Laribacter hongkongensis | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0066-4804&volume=49&spage=1957&epage=1964&date=2005&atitle=Cloning+and+Characterization+of+Chromosomal+Class+C+-Lactamase+and+Its+Regulatory+Gene+in+Laribacter+hongkongensis. | en_HK |
dc.identifier.email | Lau, SKP:skplau@hkucc.hku.hk | en_HK |
dc.identifier.email | Ho, PL:plho@hkucc.hku.hk | en_HK |
dc.identifier.email | Tsoi, HW:hwtsoi@hkucc.hku.hk | en_HK |
dc.identifier.email | Woo, PCY:pcywoo@hkucc.hku.hk | en_HK |
dc.identifier.email | Yuen, KY:kyyuen@hkucc.hku.hk | en_HK |
dc.identifier.authority | Lau, SKP=rp00486 | en_HK |
dc.identifier.authority | Ho, PL=rp00406 | en_HK |
dc.identifier.authority | Tsoi, HW=rp00439 | en_HK |
dc.identifier.authority | Woo, PCY=rp00430 | en_HK |
dc.identifier.authority | Yuen, KY=rp00366 | en_HK |
dc.description.nature | link_to_OA_fulltext | - |
dc.identifier.doi | 10.1128/AAC.49.5.1957-1964.2005 | en_HK |
dc.identifier.pmid | 15855519 | - |
dc.identifier.pmcid | PMC1087626 | - |
dc.identifier.scopus | eid_2-s2.0-18244391437 | en_HK |
dc.identifier.hkuros | 114670 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-18244391437&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 49 | en_HK |
dc.identifier.issue | 5 | en_HK |
dc.identifier.spage | 1957 | en_HK |
dc.identifier.epage | 1964 | en_HK |
dc.identifier.isi | WOS:000228982600040 | - |
dc.publisher.place | United States | en_HK |
dc.identifier.scopusauthorid | Lau, SKP=7401596211 | en_HK |
dc.identifier.scopusauthorid | Ho, PL=7402211363 | en_HK |
dc.identifier.scopusauthorid | Li, MWS=8967745900 | en_HK |
dc.identifier.scopusauthorid | Tsoi, HW=6603822102 | en_HK |
dc.identifier.scopusauthorid | Yung, RWH=7005594277 | en_HK |
dc.identifier.scopusauthorid | Woo, PCY=7201801340 | en_HK |
dc.identifier.scopusauthorid | Yuen, KY=36078079100 | en_HK |
dc.identifier.issnl | 0066-4804 | - |