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Maruthamuthu, Murali kannan,Hong, Jiyeon,Arulsamy, Kulandaisamy,Somasundaram, Sivachandiran,Hong, SoonHo,Choe, Woo-Seok,Yoo, Ik-Keun Springer-Verlag 2018 Bioprocess and biosystems engineering Vol.41 No.4
<P>Peptide-displaying Escherichia coli cells were investigated for use in adsorptive removal of bisphenol A (BPA) both in Luria-Bertani medium including BPA or ATM thermal paper eluted wastewater. Two recombinant strains were constructed with monomeric and dimeric repeats of the 7-mer BPA-binding peptide (KSLENSY), respectively. Greater than threefold increased adsorption of BPA [230.4 A mu mol BPA per g dry cell weight (DCW)] was found in dimeric peptide-displaying cells compared to monomeric strains (63.4 A mu mol per g DCW) in 15 ppm BPA solution. The selective removal of BPA from a mixture of BPA analogs (bisphenol F and bisphenol S) was verified in both monomeric and dimeric peptide-displaying cells. The binding chemistry of BPA with the peptide was assumed, based on molecular docking analysis, to be the interaction of BPA with serine and asparagine residues within the 7-mer peptide sequence. The peptide-displaying cells also functioned efficiently in thermal paper eluted wastewater containing 14.5 ppm BPA.</P>
Vidhya Selvamani,Murali Kannan Maruthamuthu,Kulandaisamy Arulsamy,엄경태,홍순호 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.6
Methylobacterium organophilum XX is a type II facultative methylotroph that can grow on methanol. In M. organophilum XX, the MxcQ/MxcE two-component system (TCS) is involved in methanol metabolism. EnvZ/OmpR in E. coli TCS was exploited to develop a methanol biosensor by engaging the MxcQ/MxcE TCS system. The MxcQZ/ OmpR methanol sensing chimeric TCS was constructed by integrating the sensing domain of M. organophilum MxcQ with the transmitter domain of E. coli EnvZ. The response regulator of the chimeric TCS system is OmpR, which regulates the expression of the ompC and gfp. The expression of ompC was monitored by real-time quantitative PCR analysis. The expression of gfp also confirmed the expression of the ompC. The maximum expression of ompC and gfp occurred with 0.05% of methanol, and the expression started to decline with further increases in methanol concentration. This system delivers rapid detection of methanol in the environment.
Vidhya Selvamani,정재훈,Murali Kannan Maruthamuthu,Kulandaisamy Arulsamy,나정걸,홍순호 한국생물공학회 2023 Biotechnology and Bioprocess Engineering Vol.28 No.2
Lithium is one of the highly used elements in various industries such as ceramics, polymer and battery. Considering the enormous demand of lithium based battery, the importance of lithium is getting higher in these days. To recover lithium in environmentally friendly manner, lithium binding peptide displaying recombinant Escherchia coli was constructed. The display of peptide was conceived by employing OmpC as an anchoring motif. The ability of the peptide to bind lithium was evaluated in three different media, and the selectivity of the peptide towards lithium was estimated. The physio-chemical and optical parameter of the adsorbed lithium nanoparticles was evaluated by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), UV, and Raman spectroscopy.