Article
Chemistry, Applied
Haipeng Su, Li Gao, Jianan Sun, Xiangzhao Mao
Summary: This study successfully modified the ChBDs of chitinase SaChiA4 to improve enzymatic activity, leading to advancements in industrial-scale hydrolysis and utilization of insoluble chitin.
Article
Biochemistry & Molecular Biology
Elena Jimenez-Ortega, Peter Elias Kidibule, Maria Fernandez-Lobato, Julia Sanz-Aparicio
Summary: This study provides a crystallographic analysis of the chitinase Chit42, revealing its important role in enzymatic mechanisms. Through mutagenesis studies, variants that improve the catalytic efficiency of chitin and NAG6 were discovered, offering new directions for engineering these crucial enzymes.
COMPUTATIONAL AND STRUCTURAL BIOTECHNOLOGY JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Bo Sun, Xingchu Zhao, Birui Xu, Erzheng Su, Andrey Kovalevsky, Qirong Shen, Dongyang Liu, Qun Wan
Summary: In this study, a hyperthermophilic chitinase (ActChi) was discovered, which can directly hydrolyze crystalline chitin at its optimal temperature of 80°C. By introducing a heterogeneous and hyperthermophilic chitin binding domain (ChBD) at the N-terminus of CDchi, the activity and thermostability of the enzyme were significantly enhanced. This strategy provides a good example of green sustainable degradation for crystalline biopolymers in nature.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Jio Song, Eung Take Lee, Ji Hyun Lee, Gyu Hyun Kim, Yong Hyun Lee, Jae Kweon Park
Summary: The purpose of this study is to improve the method for characterizing enzyme kinetics on chitin and address the inconvenience of colloidal chitin production and use. By partially hydrolyzing and acetylating high molecular weight chitosan, a low molecular weight substrate was prepared. The study confirmed the activity of chitinase under optimal reaction conditions using acetylated low molecular weight chitin.
PROCESS BIOCHEMISTRY
(2023)
Article
Environmental Sciences
Digvijay Dahiya, Akhil Pilli, Pratap Raja Reddy Chirra, Vinay Sreeramula, Nitish Venkateswarlu Mogili, Seenivasan Ayothiraman
Summary: The study focuses on the processing of shellfishery industrial wastes and the valuable component chitin. A novel gram-positive bacterial strain capable of solubilizing chitin was identified and characterized. The factors affecting the chitinase activity were investigated, and the optimum conditions for enzyme activity were determined.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Pia Ramos, Einat Chetrit, Nofar Yehuda, David Kogan, Yu Miao, Einat Nativ-Roth, Ariel Kushmaro, Ronen Berkovich, Shaily Mahendra, Moshe Gottlieb
Summary: Chitosan hydrogels are widely used in many industries for their versatility and antimicrobial properties. However, their limitations arise from poor mechanical properties and the need to use toxic compounds during fabrication. This study synthesized a soluble and antimicrobial chitosan derivative (HTCC) and compared different crosslinking agents' effects on hydrogel formation. The addition of silver nanoparticles (Ag NPs) improved the mechanical properties and the release of Ag ions effectively inhibited the growth of various bacteria.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Biochemical Research Methods
Arun Kumar Subramani, Ritu Raval, Subramaniam Sundareshan, Rashmi Sivasengh, Keyur Raval
Summary: In this study, a novel marine bacterium Bacillus aryabhattai isolated from the Arabian Sea was found to have the ability to breakdown chitin and exhibit antifungal activity. Optimization of media and process parameters enhanced the specific enzyme activity and the chitinase showed inhibitory effects against certain plant pathogenic fungi.
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY
(2022)
Article
Physiology
Maiara do Valle Faria Gama, Caroline Silva Moraes, Bruno Gomes, Hector Manuel Diaz-Albiter, Rafael Dias Mesquita, Eloy Seabra-Junior, Patricia Azambuja, Eloi de Souza Garcia, Fernando Ariel Genta
Summary: Chitinases are enzymes responsible for hydrolyzing chitin chains, and they have diverse functions in insects, potentially being involved in reproductive physiology and vector fitness. This study characterized the structure and function of chitinases in Rhodnius prolixus through genome annotation and RNAi silencing.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Itsumi Tani, Shogo Ito, Yukiko Shirahata, Yutaka Matsuyama, James G. Omichinski, Yasuyuki Shimohigashi, Rui Kamada, Kazuyasu Sakaguchi
Summary: The study investigated the roles of two Arg residues in the metal-dependent protein phosphatase PPM1A on dephosphorylation activity. Results indicated that both Arg residues were crucial for enzymatic activity, with Arg186 positioned to interact with the substrate phosphate group. The significance of each Arg residue in catalysis depended on the specific substrate.
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
(2021)
Review
Immunology
Jason R. Devlin, Judith Behnsen
Summary: It has been recognized that both environmental and pathogenic bacteria express chitinases and chitin-binding proteins, even though mammals do not produce chitin. These proteins play a role in bacterial colonization and infection by targeting immune system components, mucins, surface glycans, as well as interacting with other microorganisms. This review highlights the wide diversity of targets for chitinases and suggests their potential as future targets for anti-infective therapeutics.
INFECTION AND IMMUNITY
(2023)
Article
Biochemistry & Molecular Biology
Brittany R. Morgan, Francesca Massi
Summary: The oligosaccharyltransferase PglB from Campylobacter lari catalyzes glycosylation of asparagine with higher efficiency for substrates containing threonine instead of serine in the +2 position. This difference in catalytic efficiency is attributed to tighter binding of threonine-containing substrates and destabilization of peptide-PglB interaction in the presence of serine due to lack of simultaneous interactions with specific residues. The structural changes in PglB influenced by different substrates ultimately affect the ability to form a catalytically competent state, demonstrating a mechanism for substrate specificity through modulation of dynamic allosteric pathways.
FRONTIERS IN MOLECULAR BIOSCIENCES
(2021)
Article
Chemistry, Physical
Pavel Malakhovsky, Ivan Reznikov, Dmitry Murausky, Mikhail Artemyev
Summary: In this study, correlations between the streaming potential of a polymeric substrate, ionic strength of a solution, and shape of silver nanoparticles on one side and the deposition kinetics, optical properties, and 2D distribution of nanoparticles in the deposited layer on the other are demonstrated. The study highlights the influence of nanoparticle shape and electrostatic repulsion on the 2D distribution.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Cell Biology
Maria Szrejder, Marlena Typiak, Piotr Pikul, Irena Audzeyenka, Patrycja Rachubik, Dorota Rogacka, Magdalena Narajczyk, Agnieszka Piwkowska
Summary: Lactate has been found to be a fuel energy source and plays an essential role in podocyte metabolism. The study demonstrated the presence of lactate transporters in podocytes and observed changes in their amount in response to glucose availability. Lactate exposure preserved cell survival and prevented glycogen reserves depletion during glucose deprivation.
EUROPEAN JOURNAL OF CELL BIOLOGY
(2023)
Article
Engineering, Environmental
Moonkyu Kim, Jaesung Kim, Hae-in Cho, Eun-Tae Yun, Jaemin Choi, Minjeong Kim, Hongshin Lee, Min Cho, Hyoung-il Kim, Jaesang Lee
Summary: This study investigated the role of peroxymonosulfate (PMS) in enhancing the photocatalytic activity of TiO2 systems for the oxidation of diverse organics, finding that PMS addition improved performance to different extents depending on the substrate. The involvement of PMS as an electron acceptor and radical precursor in the oxidizing process was confirmed, and surface platinization played a role in the nonphoton-driven degradative pathway.
ACS ES&T ENGINEERING
(2021)
Proceedings Paper
Agricultural Engineering
M. J. Gomez-Bellot, B. Lorente, I. Zugasti, P. Nortes, M. J. Sanchez-Blanco, M. F. Ortuno, J. J. Alarcon
Summary: The study showed that using a mixed substrate and arbuscular mycorrhizal fungi had positive effects on tomato plants irrigated with saline reclaimed water, improving plant water status, gas exchange, and fruit quality.
IX INTERNATIONAL SYMPOSIUM ON IRRIGATION OF HORTICULTURAL CROPS
(2022)