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Fulltext Isolation and characterization of Burkholderia sp. strain CCA53 exhibiting ligninolytic potential

Akita H, Kimura Z, Mohd Yusoff MZ, Nakashima N, Hoshino T

Springerplus, 2016;5:596.

PMID: 27247892 DOI: 10.1186/s40064-016-2237-y

Microbial degradation of lignin releases fermentable sugars, effective utilization of which could support biofuel production from lignocellulosic biomass. In the present study, a lignin-degrading bacterium was isolated from leaf soil and identified as Burkholderia sp. based on 16S rRNA gene sequencing. This strain was named CCA53, and its lignin-degrading capability was assessed by observing its growth on medium containing alkali lignin or lignin-associated aromatic monomers as the sole carbon source. Alkali lignin and at least eight lignin-associated aromatic monomers supported growth of this strain, and the most effective utilization was observed for p-hydroxybenzene monomers. These findings indicate that Burkholderia sp. strain CCA53 has fragmentary activity for lignin degradation.

Fulltext Draft Genome Sequence of Burkholderia sp. Strain CCA53, Isolated from Leaf Soil

Akita H, Kimura Z, Yusoff MZ, Nakashima N, Hoshino T

Genome Announc, 2016;4(4).

PMID: 27389268 DOI: 10.1128/genomeA.00630-16

Burkholderia sp. strain CCA53 was isolated from leaf soil collected in Higashi-Hiroshima City in Hiroshima Prefecture, Japan. Here, we present a draft genome sequence of this strain, which consists of a total of 4 contigs containing 6,647,893 bp, with a G+C content of 67.0% and comprising 9,329 predicted coding sequences.

Fulltext Identification and characterization of Burkholderia multivorans CCA53

Akita H, Kimura ZI, Yusoff MZM, Nakashima N, Hoshino T

BMC Res Notes, 2017 Jul 06;10(1):249.

PMID: 28683814 DOI: 10.1186/s13104-017-2565-1

OBJECTIVE: A lignin-degrading bacterium, Burkholderia sp. CCA53, was previously isolated from leaf soil. The purpose of this study was to determine phenotypic and biochemical features of Burkholderia sp. CCA53.

RESULTS: Multilocus sequence typing (MLST) analysis based on fragments of the atpD, gltD, gyrB, lepA, recA and trpB gene sequences was performed to identify Burkholderia sp. CCA53. The MLST analysis revealed that Burkholderia sp. CCA53 was tightly clustered with B. multivorans ATCC BAA-247T. The quinone and cellular fatty acid profiles, carbon source utilization, growth temperature and pH were consistent with the characteristics of B. multivorans species. Burkholderia sp. CCA53 was therefore identified as B. multivorans CCA53.

Production of acetoin from hydrothermally pretreated oil mesocarp fiber using metabolically engineered Escherichia coli in a bioreactor system

Mohd Yusoff MZ, Akita H, Hassan MA, Fujimoto S, Yoshida M, Nakashima N, et al.

Bioresour Technol, 2017 Dec;245(Pt A):1040-1048.

PMID: 28946206 DOI: 10.1016/j.biortech.2017.08.131

Acetoin is used in the biochemical, chemical and pharmaceutical industries. Several effective methods for acetoin production from petroleum-based substrates have been developed, but they all have an environmental impact and do not meet sustainability criteria. Here we describe a simple and efficient method for acetoin production from oil palm mesocarp fiber hydrolysate using engineered Escherichia coli. An optimization of culture conditions for acetoin production was carried out using reagent-grade chemicals. The final concentration reached 29.9gL(-1) with a theoretical yield of 79%. The optimal pretreatment conditions for preparing hydrolysate with higher sugar yields were then determined. When acetoin was produced using hydrolysate fortified with yeast extract, the theoretical yield reached 97% with an acetoin concentration of 15.5gL(-1). The acetoin productivity was 10-fold higher than that obtained using reagent-grade sugars. This approach makes use of a compromise strategy for effective utilization of oil palm biomass towards industrial application.

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