In the present study, a laccase gene (BaLc) from a lignin degrading
bacterium, Bacillus atrophaeus, has been cloned
and expressed in Escherichia coli. The optimal catalytic activity
of the protein was achieved at 5.5 pH and 35°C temperature,
measured by oxidation of ABTS. The Km and Vmax
values were determined as 1.42 mM and 4.16 μmole/min, respectively.
To achieve the enzyme recovery, the biocatalyst
(BaLc) was covalently attached onto the functionalized iron
magnetic-nanoparticles. The nanoparticles were characterized
by zeta-potential and FTIR analyses. The immobilized BaLc
enzyme was physico-kinetically characterized, exhibiting retention
of 60% of the residual activity after ten reaction cycles
of ABTS oxidation. The immobilized biocatalyst system was
tested for its biotechnological exploitability in plant juice
processing, achieving 41–58% of phenol reduction, 41–58%
decolorization, 50–59% turbidity reduction in the extracts of
banana pseudo-stem and sweet sorghum stalk, and apple fruit
juice. This is the first study to demonstrate the use of nanoparticle-
laccase conjugate in juice clarification. The findings
suggest that B. atrophaus laccase is a potential catalytic tool
for plant juice bioprocessing activities.
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The efficiency of the two white-rot fungi Pycnoporus coccineus and Coriolopsis polyzona in the Olive Oil Mill Wastewater (OOMW) treatment was investigated. Both fungi were active in the decolourisation and COD removal of OOMW at 50 g/L COD, but only the first fungus remains effective on the crude effluent (COD=100 g/L). Moreover P. coccineus was less affected by oxygen supplementation and exhibited a high tolerance to agitation in comparison to C. polyzona. However, it required a nitrogen supplementation to obtain faster and higher COD removal. To overcome the negative effect of agitation on fungi growth and efficiency, immobilisation of C. polyzona and P. coccineus in polyurethane foam was applied. The immobilized system showed better COD decreases during three consecutive batches without remarkable loss of performances. The results obtained in this study suggested that immobilized C. polyzona and especially immobilized P. coccineus might be applicable to a large scale for the removal colour and COD of OOMW.
The flanking genetic structure of qnrA1 in Korean Enterobacter
cloacae was identical to that of the Chinese Escherichia
coli strain, the first qnrA1-carrying strain reported in Asia.
Analysis of restriction enzyme sites and Southern blot
hybridization results showed that qnrA1 was transferred
between E. cloacae and E. coli via Inc HI2 type plasmid.
Plasmid pRJ6 is the first known bacteriocinogenic mobilizable (Mob) plasmid of Staphylococcus aureus. Its Mob region is composed of four mob genes (mobCDAB) arranged as an operon, a genetic organization uncommon among S. aureus Mob plasmids. oriTpRJ6 was detected in a region of 431 bp, positioned immediately upstream of mobC. This region, when cloned into pCN37, was able to confer mobilization to the recombinant plasmid only in the presence of pRJ6. The entire Mob region, including oriTpRJ6, is much more similar to Mob regions from several coagulase-negative staphylococci plasmids, although some remarkable similarities with S. aureus Mob plasmids can also be noted. These similarities include the presence within oriTpRJ6 of the three mcb (MobC binding sites), firstly described in pC221 and pC223, an identical nick site also found in these same plasmids, and a nearly identical srapC223 site (sequence recognized by MobA). pRJ6 was successfully transferred to S. epidermidis by conjugation in the presence of the conjugative plasmid pGO1. Altogether these findings suggest that pRJ6 might have been originally a coagulase-negative staphylococci plasmid that had been transferred successfully to S. aureus.
The feasibility of laccase production by immobilization of Pleurotus ostreatus 1804 on polyurethane foam (PUF) cubes with respect to media composition was studied in both batch and reactor systems. Enhanced laccase yield was evidenced due to immobilization. A relatively high maximum laccase activity of 312.6 U was observed with immobilized mycelia in shake flasks compared to the maximum laccase activity of free mycelia (272.2 U). It is evident from this study that the culture conditions studied, i.e. biomass level, pH, substrate concentration, yeast extract concentration, Cu^2^+ concentration, and alcohol nature, showed significant influence on the laccase yield. Gel electrophoretic analysis showed the molecular weight of the laccase produced by immobilized P. ostreatus to be 66 kDa. The laccase yield was significantly higher and more rapid in the packed bed reactor than in the shake flask experiments. A maximum laccase yield of 392.9 U was observed within 144 h of the fermentation period with complete glucose depletion.
There is considerable interest in how microbiological processes can affect the behaviour of metal contaminants in natural and engineered environments and their potential for bioremediation. The extent to which microorganisms can affect metal contaminants is dependent on the identity and chemical form of the metal and the physical and chemical nature of the contaminated site or substance. In general terms, microbial processes which solubilize metals increase their bioavailability and potential toxicity, whereas those that immobilize them reduce bioavailability. The balance between mobilization and immobilization varies depending on the metal, the organisms, their environment and physico-chemical conditions.