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Aeromonas punctata derived depolymerase improves susceptibility of Klebsiella pneumoniae biofilm to gentamicin

Overview of attention for article published in BMC Microbiology, June 2015
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Title
Aeromonas punctata derived depolymerase improves susceptibility of Klebsiella pneumoniae biofilm to gentamicin
Published in
BMC Microbiology, June 2015
DOI 10.1186/s12866-015-0455-z
Pubmed ID
Authors

Shruti Bansal, Kusum Harjai, Sanjay Chhibber

Abstract

To overcome antibiotic resistance in biofilms, enzymes aimed at biofilm dispersal are under investigation. In the present study, applicability of an Aeromonas punctata derived depolymerase capable of degrading the capsular polysaccharide (CPS) of Klebsiella pneumoniae, in disrupting its biofilm and increasing gentamicin efficacy against biofilm was investigated. Intact biofilm of K. pneumoniae was recalcitrant to gentamicin due to lack of antibiotic penetration. On the other hand, gentamicin could not act on disrupted biofilm cells due to their presence in clusters. However, when depolymerase (20 units/ml) was used in combination with gentamicin (10 μg/ml), dispersal of CPS matrix by enzyme facilitated gentamicin penetration across biofilm. This resulted in significant reduction (p < 0.05) in bacterial count in intact and disrupted biofilms. Reduction in CPS after treatment with depolymerase was confirmed by confocal microscopy and enzyme linked lectinosorbent assay. Furthermore, to substantiate our study, the efficacy of bacterial depolymerase was compared with a phage borne depolymerase possessing similar application against K. pneumoniae. Although both were used at same concentration i.e. 20 units/ml, but a higher efficacy of bacterial depolymerase particularly against older biofilms was visibly clear over its phage counterpart. This could be explained due to high substrate affinity (indicated by Km value) and high turnover number (indicated by Kcat value) of the bacterial depolymerase (Km = 89.88 μM, Kcat = 285 s(-1)) over the phage derived one (Km = 150 μM, Kcat = 107 s(-1)). Overall the study indicated that, the A. punctata derived depolymerase possesses antibiofilm potential and improves gentamicin efficacy against K. pneumoniae. Moreover, it can serve as a potential substitute to phage borne depolymerases for treating biofilms formed by K. pneumoniae.

Twitter Demographics

The data shown below were collected from the profiles of 2 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 12 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 12 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 3 25%
Student > Master 2 17%
Researcher 2 17%
Professor 1 8%
Professor > Associate Professor 1 8%
Other 0 0%
Unknown 3 25%
Readers by discipline Count As %
Immunology and Microbiology 3 25%
Biochemistry, Genetics and Molecular Biology 2 17%
Agricultural and Biological Sciences 1 8%
Unknown 6 50%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 13 June 2015.
All research outputs
#3,675,655
of 5,223,626 outputs
Outputs from BMC Microbiology
#707
of 1,043 outputs
Outputs of similar age
#125,723
of 178,144 outputs
Outputs of similar age from BMC Microbiology
#24
of 36 outputs
Altmetric has tracked 5,223,626 research outputs across all sources so far. This one is in the 16th percentile – i.e., 16% of other outputs scored the same or lower than it.
So far Altmetric has tracked 1,043 research outputs from this source. They receive a mean Attention Score of 2.8. This one is in the 19th percentile – i.e., 19% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 178,144 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 18th percentile – i.e., 18% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 36 others from the same source and published within six weeks on either side of this one. This one is in the 13th percentile – i.e., 13% of its contemporaries scored the same or lower than it.