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Biotechnology Letters

Ivonne Figueroa-González, Gloria Moreno, Julián Carrillo-Reyes, Arturo Sánchez, Guillermo Quijano, Germán Buitrón
OBJECTIVES: To assess the effect of one-step temperature increase, from 35 to 55 °C, on the methane production of a mesophilic granular sludge (MGS) treating wine vinasses and the effluent of a hydrogenogenic upflow anaerobic sludge blanket (UASB) reactor. RESULTS: One-step temperature increase from mesophilic to thermophilic conditions improved methane production regardless of the substrate tested. The biomethane potentials obtained under thermophilic conditions were 1...
December 7, 2017: Biotechnology Letters
Dan Liu, Kun Du, Wei Feng
OBJECTIVE: To design a fusion polypeptide combining functions of self-assembly and purification for immobilizing enzymes. RESULTS: A collagen-like polypeptide (CLP) was fused to an elastin-like polypeptide (ELP) through genetic engineering. CLP-ELP was separately fused to superoxide dismutase (SOD) and D-amino acid oxidase (DAAO). The recombinant enzymes were purified with using reversible phase transition. The interfering effect of H2O2 on the secondary structures of the recombinant enzymes was significantly reduced...
December 5, 2017: Biotechnology Letters
Yujuan Han, Peixin Gao, Wengong Yu, Xinzhi Lu
In Table 1 as published, some of the data were wrong. The corrected Table 1 is shown below.
December 5, 2017: Biotechnology Letters
Wei Wang, Yang Yu, Tong-Yi Dou, Jia-Yue Wang, Chenggong Sun
OBJECTIVES: To screen the phylogenetically-nearest members of Cellulosimicrobium cellulans for the production of cellulosome-like multienzyme complexes and extracellular β-xylosidase activity against 7-xylosyltaxanes and to get corresponding molecular insights. RESULTS: Cellulosimicrobium (family Promicromonosporaceae) and all genera of the family Cellulomonadeceaec produced both cellulosome-like multienzyme complexes and extracellular β-xylosidase activity, while the other genera of the family Promicromonosporaceae did not...
December 4, 2017: Biotechnology Letters
Zhen Wang, Jinhui Pang, Bin Ji, Shailin Zhang, Yan Cheng, Luchao Yu, Weicheng Pan
OBJECTIVES: To explore the effects of Lin28A on progression of osteocarcinoma (OS) cells. RESULTS: Lin28A mRNA and protein expressions were significantly increased in OS tissues compared with that in normal adjacent tissues. Expressions of Lin28A and long noncoding RNA MALAT1 were positively correlated. Patients with higher Lin28A expression had shorter overall survival. Moreover, Lin28A knockdown inhibited OS cells proliferation, migration, invasion and promoted cell apoptosis; Lin28A was found to harbor binding sites on MALAT1 sequences and associated with MALAT1, and increased MALAT1 stability and expression...
December 4, 2017: Biotechnology Letters
Yujuan Han, Peixin Gao, Wengong Yu, Xinzhi Lu
In Table 1 as published, some of the data were wrong. The corrected Table 1 is shown here. In addition, according to the corrected Table 1, the sentence "the k cat /K m of CsnA-CBM5 was higher than that of WT by 143%" in the part of "The kinetic parameters and specific activity" in the Results part should be changed to "the k cat /K m of CsnA-CBM5 was higher than that of WT by 110%".
December 4, 2017: Biotechnology Letters
Di Ke, Qinggele Caiyin, Fanglong Zhao, Ting Liu, Wenyu Lu
OBJECTIVES: To genetically engineer Escherichia coli for the heterologous biosynthesis of triterpenoid, ambrein, the main bioactive component of ambergris, by constituting a novel squalene-derived ambrein biosynthetic pathway in E. coli. RESULTS: The ScERG9 gene encoding the squalene synthase (SS) was integrated into the E. coli genome to generate a squalene-producing strain that supplied the central precursor squalene for the formation of cyclic triterpenoids. The mutated squalene-hopene synthase (D377C SHC) and the tetraprenyl-β-curcumene cyclase (BmeTC) were co-expressed with SS to construct a novel ambrein biosynthetic pathway in E...
December 4, 2017: Biotechnology Letters
Tatyana Laurinavichene, Kestutis Laurinavichius, Evgeny Shastik, Anatoly Tsygankov
OBJECTIVES: To prove the possibility of efficient starch photofermentation in co-culture of heterotrophic and phototrophic bacteria over prolonged period. RESULTS: Repeated batch photofermentation of starch was demonstrated in co-culture Clostridium butyricum and Rhodobacter sphaeroides under microaerobic conditions. It continued 15 months without addition of new inoculum or pH regulation when using 4-5 g starch l-1 and 0.04 g yeast extract l-1. The complete degradation of starch without volatile fatty acids accumulation was shown in this co-culture...
November 30, 2017: Biotechnology Letters
Wenguang Zhang, Dongmei Liu, Jianzhuang Ren, Pengli Zhou, Xinwei Han
OBJECTIVES: To investigate the potential role and underlying mechanism of Sirtuin2 (SIRT2) in regulating high glucose (HG)-induced vascular endothelial cell injury by using human umbilical vein endothelial cells (HUVECs). RESULTS: SIRT2 mRNA and protein expression levels were decreased in HG-treated HUVECs. SIRT2 overexpression increased viability, decreased apoptosis and reduced levels of reactive oxygen species in HG-treated HUVECs. SIRT2 overexpression decreased TNF-α expression (146...
November 30, 2017: Biotechnology Letters
Klára Herkommerová, Jana Zemančíková, Hana Sychrová, Zuzana Antošová
OBJECTIVES: To improve the storage stability and reusability of various yeast strains and species by immobilization in polyvinyl alcohol (PVA) hydrogel particles. RESULTS: Debaryomyces hansenii, Pichia sorbitophila, Saccharomyces cerevisiae, Yarrowia lipolytica, and Zygosaccharomyces rouxii were immobilized in PVA particles using LentiKats technology and stored in sterile water at 4 °C. The immobilization improved the survival of all species; however, the highest storage stability was achieved for S...
November 30, 2017: Biotechnology Letters
Camilo Soto-Argel, Diego Hidalgo, Javier Palazon, Purificación Corchete
OBJECTIVES: To explore the potentiality of undifferentiated Pimpinella anisum L. cell cultures for the production of secondary metabolites by means of elicitation. RESULTS: Two chromone compounds were secreted to the medium of undifferentiated cultures of P. anisum: 4-methoxyfuro[3,2-g]chromen-7-one, known as bergapten, which is constitutive to anise, and 5-hydroxy-7-methoxy-2-methylchromen-4-one, the rare chromone eugenin, not yet described in P. anisum. Caffeoyl quinic acid species were also identified in the biomass...
November 28, 2017: Biotechnology Letters
Dinali Ranmadugala, Alireza Ebrahiminezhad, Merilyn Manley-Harris, Younes Ghasemi, Aydin Berenjian
Bacterial cell immobilization is a novel technique used in many areas of biosciences and biotechnology. Iron oxide nanoparticles have attracted much attention in bacterial cell immobilization due to their unique properties such as superparamagnetism, large surface area to volume ratio, biocompatibility and easy separation methodology. Adhesion is the basis behind many immobilization techniques and various types of interactions determine bacterial adhesion. Efficiency of bacterial cell immobilization using iron oxide nanoparticles (IONs) generally depends on the physicochemical properties of the IONs and surface properties of bacterial cells as well as environmental/culture conditions...
November 27, 2017: Biotechnology Letters
S Sudhagar, S Sathya, R Anuradha, G Gokulapriya, Y Geetharani, B S Lakshmi
OBJECTIVES: To examine the potential of ferulic acid and 4-vinylguaiacol for inhibiting epidermal growth factor receptor (EGFR) in human breast cancer cells in vitro. RESULTS: Ferulic acid and 4-vinylguaiacol limit the EGF (epidermal growth factor)-induced breast cancer proliferation and new DNA synthesis. Western blot analysis revealed both ferulic acid and 4-vinylguaiacol exhibit sustained inhibition of EGFR activation through down-regulation of Tyr 1068 autophosphorylation...
November 21, 2017: Biotechnology Letters
Xiuling Shang, Xin Chai, Xuemei Lu, Yuan Li, Yun Zhang, Guoqiang Wang, Chen Zhang, Shuwen Liu, Yu Zhang, Jiyin Ma, Tingyi Wen
OBJECTIVE: To identify useful native promoters of Corynebacterium glutamicum for fine-tuning of gene expression in metabolic engineering. RESULTS: Sixteen native promoters of C. glutamicum were characterized. These promoters covered a strength range of 31-fold with small increments and exhibited relatively stable activity during the whole growth phase using β-galactosidase as the reporter. The mRNA level and enzymatic activity of the lacZ reporter gene exhibited high correlation (R (2) = 0...
November 21, 2017: Biotechnology Letters
Kyungsu Kang, Lei Peng, Yu-Jin Jung, Joo Yeon Kim, Eun Ha Lee, Hee Ju Lee, Sang Min Kim, Sang Hyun Sung, Cheol-Ho Pan, Yongsoo Choi
OBJECTIVES: To develop a high-throughput screening system to measure the conversion of testosterone to dihydrotestosterone (DHT) in cultured human prostate cancer cells using turbulent flow chromatography liquid chromatography-triple quadrupole mass spectrometry (TFC-LC-TQMS). RESULTS: After optimizing the cell reaction system, this method demonstrated a screening capability of 103 samples, including 78 single compounds and 25 extracts, in less than 12 h without manual sample preparation...
November 21, 2017: Biotechnology Letters
Shin-Hye Yu, So-Hyung Kwak, Thi Thanh Hanh Nguyen, Ye-Seul Seo, Chaeri Song, Il Kyoon Mok, Doman Kim
OBJECTIVES: To develop preventive canine oral health bio-materials consisting of probiotics and glucanase to reduce insoluble glucan and volatile sulfur compound formation. RESULTS: Co-cultivation of Enterococcus faecium T7 with Streptococcus mutans at inoculation ratio of 3:1 (v/v) resulted in 25% reduction in the growth of Streptococcus mutans. Amounts of soluble and insoluble glucans produced by S. mutans were decreased to 70 and 55%, respectively. Insoluble glucan was decreased from 0...
November 21, 2017: Biotechnology Letters
Jianing Yang, Shengjun Zhao, Yunfei Ji, Lili Zhao, Qingzhu Kong, Qing Zhang
OBJECTIVE: To fabricate in vitro cell-dense, three-dimensional (3D) tumor models by employing a cell sheet technology for testing anti-cancer drug efficacy. RESULTS: The stratified liver tumor models were fabricated by stacking contiguous HepG2 cell sheets. Triple-layer (3L), double-layer (2L), single-layer (1L) cell sheet-based liver tumor models (CSLTMs) demonstrated 106, 96, 85% cell viability, respectively, after 3 days treatment of 10 µM doxorubicin hydrochloride (DOX), while cell viability in two-dimensional (2D) conventional culture (control) was 27%...
November 20, 2017: Biotechnology Letters
Michelle H Rich, Abigail V Sharrock, Kelsi R Hall, David F Ackerley, Joanna K MacKichan
OBJECTIVES: To characterize the activities of two candidate nitroreductases, Neisseria meningitidis NfsA (NfsA_Nm) and Bartonella henselae (PnbA_Bh), with the nitro-prodrugs, CB1954 and metronidazole, and the environmental pollutants 2,4- and 2,6-dinitrotoluene. RESULTS: NfsA_Nm and PnbA_Bh were evaluated in Escherichia coli over-expression assays and as His6-tagged proteins in vitro. With the anti-cancer prodrug CB1954, both enzymes were more effective than the canonical O2-insensitive nitroreductase E...
November 17, 2017: Biotechnology Letters
Colin Ratledge
No abstract text is available yet for this article.
November 15, 2017: Biotechnology Letters
Jaya Kumar Arjun, Balakrishna Pillai Aneesh, Thulasi Kavitha, Kumarapillai Harikrishnan
OBJECTIVES: To screen soil metagenomic libraries for novel enzymes with enhanced activities. RESULTS: To screen soil metagenomic libraries for novel enzymes with enhanced activities. A novel L-asparaginase was identified from forest soil metagenome and its characteristics were studied. The purified protein had a specific activity of 696 IU mg(-1) and optimum activity at pH 7 and 35 °C. Enhanced enzyme activities were observed in the presence of Mg(2+), Ca(2+) and K(+)...
November 10, 2017: Biotechnology Letters
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