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Characterization of a Bacillus thuringiensis chitinase that binds to cellulose and chitin

Overview of attention for article published in AMB Express, February 2017
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Title
Characterization of a Bacillus thuringiensis chitinase that binds to cellulose and chitin
Published in
AMB Express, February 2017
DOI 10.1186/s13568-017-0352-y
Pubmed ID
Authors

Shotaro Honda, Toshiyuki Kunii, Kenta Nohara, Satoshi Wakita, Yasusato Sugahara, Masao Kawakita, Fumitaka Oyama, Masayoshi Sakaguchi

Abstract

Bacillus thuringiensis is a Gram-positive soil bacterium that is known to be a bacterial biopesticide that produces insecticidal proteins called crystal proteins (Cry). In the insecticidal process, chitinases are suggested to perforate the peritrophic membrane barrier to facilitate the invasion of the Cry proteins into epithelial membranes. A chitinase gene from B. thuringiensis was successfully expressed in a soluble form in Escherichia coli, and the gene product was purified and characterized. The purified recombinant enzyme, BthChi74, hydrolyzed an artificial substrate, 4-nitrophenyl N,N'-diacetyl-β-D-chitobioside [4NP-(GlcNAc)2], and the natural substrates, colloidal chitin and crystalline α-chitin, but it did not hydrolyze cellulose. BthChi74 exhibited catalytic activity under a weakly acidic to neutral pH range at 50 °C, and it was stable over a wide pH range for 24 h. Differential scanning fluorimetry (DSF) indicated a protein melting temperature (T m) of 63.6 °C. Kinetic analysis revealed k cat and K M values of 1.5 s(-1) and 159 μM, respectively, with 4NP-(GlcNAc)2 as a substrate. BthChi74 produced (GlcNAc)2 and GlcNAc from colloidal chitin and α-chitin as substrates, but the activity toward the latter was lower than that toward the former. BthChi74 could bind similarly to chitin beads, crystalline α-chitin, and cellulose through a unique family 2 carbohydrate-binding module (CBM2). The structure-function relationships of BthChi74 are discussed in relation to other chitinases, such as Listeria chitinase, which possesses a family 5 carbohydrate-binding module (CBM5).

Twitter Demographics

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Mendeley readers

The data shown below were compiled from readership statistics for 49 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 49 100%

Demographic breakdown

Readers by professional status Count As %
Researcher 9 18%
Student > Bachelor 8 16%
Student > Ph. D. Student 8 16%
Student > Master 5 10%
Student > Doctoral Student 4 8%
Other 5 10%
Unknown 10 20%
Readers by discipline Count As %
Biochemistry, Genetics and Molecular Biology 16 33%
Agricultural and Biological Sciences 15 31%
Immunology and Microbiology 3 6%
Engineering 2 4%
Business, Management and Accounting 1 2%
Other 2 4%
Unknown 10 20%

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 28 February 2017.
All research outputs
#4,964,919
of 9,128,382 outputs
Outputs from AMB Express
#254
of 589 outputs
Outputs of similar age
#147,935
of 253,794 outputs
Outputs of similar age from AMB Express
#19
of 55 outputs
Altmetric has tracked 9,128,382 research outputs across all sources so far. This one is in the 27th percentile – i.e., 27% of other outputs scored the same or lower than it.
So far Altmetric has tracked 589 research outputs from this source. They receive a mean Attention Score of 2.2. This one is in the 7th percentile – i.e., 7% 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 253,794 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 32nd percentile – i.e., 32% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 55 others from the same source and published within six weeks on either side of this one. This one is in the 1st percentile – i.e., 1% of its contemporaries scored the same or lower than it.