1
|
Giardina BJ, Shahzad S, Huang W, Wilks A. Heme uptake and utilization by hypervirulent Acinetobacter baumannii LAC-4 is dependent on a canonical heme oxygenase (abHemO). Arch Biochem Biophys 2019; 672:108066. [PMID: 31398314 DOI: 10.1016/j.abb.2019.108066] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 08/02/2019] [Accepted: 08/06/2019] [Indexed: 02/06/2023]
Abstract
Acinetobacter baumannii is an opportunistic pathogen that causes serious infections in critically ill and immune compromised patients. The ability to acquire iron from the hosts iron and heme containing proteins is critical to their survival and virulence. The majority of A. baumannii hypervirulent strains encode a heme uptake system that includes a putative heme oxygenase (hemO). Despite reports indicating A. baumannii can grow on heme direct evidence of extracellular heme uptake and metabolism has not been shown. Through isotopic labeling (13C-heme) we show the hypervirulent A. baumannii LAC-4 metabolizes heme to biliverdin IXα (BVIXα), whereas ATC 17978 that lacks the hemO gene cluster cannot efficiently utilize heme. Expression and purification of the protein encoded by the A. baumannii LAC-4 hemO gene confirmed catalytic conversion of heme to BVIX. We further show inhibition of abHemO with previously characterized P. aeruginosa HemO inhibitors in a fluorescence based assay that couples HemO catalytic activity to the BVIXα binding phytochrome IFP1.4. Furthermore, the hemO gene cluster encodes genes with homology to heme-dependent extra cytoplasmic function (ECF) σ factor systems. The hemophore-dependent ECF system in Pseudomonas aeruginosa has been shown to play a critical role in heme sensing and virulence within the host. The prevalence of a hemO gene cluster in A. baumannii LAC4 and other hypervirulent strains suggests it is required within the host to adapt and utilize heme and is a major contributor to virulence.
Collapse
Affiliation(s)
- Bennett J Giardina
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD, 21201, USA
| | - Saba Shahzad
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD, 21201, USA
| | - Weiliang Huang
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD, 21201, USA
| | - Angela Wilks
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, MD, 21201, USA.
| |
Collapse
|
2
|
Kim SJ, Kim YJ, Ko KS. Genomic Analysis of Consecutive Acinetobacter baumannii Strains From a Single Patient. Front Microbiol 2018; 9:2840. [PMID: 30542330 PMCID: PMC6277775 DOI: 10.3389/fmicb.2018.02840] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 11/05/2018] [Indexed: 11/13/2022] Open
Abstract
Acinetobacter baumannii is one of the most important nosocomial pathogens, and thus it is required to investigate how it disseminate in hospitals and infect patients. We performed whole genome sequencing for 24 A. baumannii strains isolated successively from the blood of a single patient to evaluate whether repeated infections were due to re-infection or relapse infection and to investigate within-host evolution. The whole genome of the first strain, BL1, was sequenced de novo using the PacBio RSII system. BL2-BL24, were sequenced with an Illumina Hiseq4000 and mapped to the genome sequences of BL1. We identified 42 single-nucleotide variations among the strains. The SNVs differentiated the strains into three groups, BL1, BL2-BL16, and BL17-BL24, indicating that the patient suffered from re-infections or co-infections by similar, but different strains. The results also showed that A. baumannii strains in each group were rather stable at the genomic level. Our study emphasizes the importance of intensive infection control.
Collapse
Affiliation(s)
- Sun Ju Kim
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon, South Korea
| | - Yae-Jean Kim
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Kwan Soo Ko
- Department of Molecular Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Suwon, South Korea
| |
Collapse
|
3
|
Lee SY, Oh MH, Yun SH, Choi CW, Park EC, Song HS, Lee H, Yi YS, Shin J, Chung C, Moon JY, Lee JC, Kim GH, Kim SI. Genomic characterization of extensively drug-resistant Acinetobacter baumannii strain, KAB03 belonging to ST451 from Korea. INFECTION GENETICS AND EVOLUTION 2018; 65:150-158. [PMID: 30053642 DOI: 10.1016/j.meegid.2018.07.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Revised: 07/06/2018] [Accepted: 07/23/2018] [Indexed: 12/23/2022]
Abstract
Extensively drug-resistant (XDR) Acinetobacter baumannii strains have emerged rapidly worldwide. The antibiotic resistance characteristics of XDR A. baumannii strains show regional differences; therefore, it is necessary to analyze both genomic and proteomic characteristics of emerging XDR A. baumannii clinical strains isolated in Korea to elucidate their multidrug resistance. Here, we isolated new sequence type of XDR A. baumannii clinical strain (KAB03) from Korean hospitals and performed comprehensive genome analyses. The strain belongs to new sequence type, ST451. Single nucleotide polymorphism (SNP) analysis with other types of A. baumannii strains revealed that KAB03 has unique SNP pattern in the regions of gyrB and gpi of MLST profiles. A. baumannii KAB03 harbours three antibiotic resistance islands (AbGRI1, 2, and 3). AbGRI1 harbours two copies of Tn2006 containing blaOXA-23, which play an important role in antibiotic resistance. AbGRI2 possesses aminoglycoside resistant gene aph(3')-Ic and class A β-lactamase blaTEM. AbGIR3 has macrolide resistant genes and aminoglycoside resistant gene armA. A. baumannii KAB03 harbours mutations in pmrB and pmrC, which are believed to confer colistin resistance. In addition, proteomic and transcriptional analysis of KAB03 confirmed that β-lactamases (ADC-73 and OXA-23), Ade efflux pumps (AdeIJK), outer membrane proteins (OmpA and OmpW), and colistin resistance genes (PmrCAB) were major proteins responsible for antibiotic resistance. Our proteogenomic results provide valuable information for multi-drug resistance in emerging XDR A. baumannii strains belonging to ST451.
Collapse
Affiliation(s)
- Sang-Yeop Lee
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea; Center for Convergent Research of Emerging Virus Infection, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
| | - Man Hwan Oh
- Department of Nanobiomedical Science, Dankook University, Cheonan 330-714, Republic of Korea
| | - Sung Ho Yun
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea
| | - Chi-Won Choi
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea; KBNP Technology Institute, KBNP, INC., Anyang 14059, Republic of Korea
| | - Edmond Changkyun Park
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea; Center for Convergent Research of Emerging Virus Infection, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea; Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Republic of Korea
| | - Hyun Seok Song
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea; Center for Convergent Research of Emerging Virus Infection, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea
| | - Hayoung Lee
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea; Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Republic of Korea
| | - Yoon-Sun Yi
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea
| | - Juhyun Shin
- Department of Urology, School of Medicine, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
| | - Chaeuk Chung
- Department of Pulmonary and Critical Care Medicine, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
| | - Jae Young Moon
- Department of Pulmonary and Critical Care Medicine, Chungnam National University Hospital, Daejeon 35015, Republic of Korea
| | - Je Chul Lee
- Department of Microbiology, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea
| | - Gun-Hwa Kim
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea; Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Republic of Korea.
| | - Seung Il Kim
- Drug & Disease Target Team, Korea Basic Science Institute, Ochang 28119, Republic of Korea; Center for Convergent Research of Emerging Virus Infection, Korea Research Institute of Chemical Technology, Daejeon 34114, Republic of Korea; Department of Bio-Analytical Science, University of Science and Technology (UST), Daejeon 34113, Republic of Korea.
| |
Collapse
|