Article
Microbiology
Brenda S. Pratte, Teresa Thiel
Summary: This study identified unique and overlapping functions of two homologous transcriptional activators, CnfR1 and CnfR2, in regulating two distinct nitrogenase systems in Anabaena variabilis. CnfR1 was found to be promiscuous in activating both nitrogenase systems, while CnfR2 relied on additional cellular factors to activate only one nitrogenase system.
MICROBIOLOGY SPECTRUM
(2021)
Article
Engineering, Environmental
Romain Darnajoux, Robert Bradley, Jean-Philippe Bellenger
Summary: This study characterizes the in vivo effect of temperature on the activities of Mo nitrogenase and V nitrogenase. It demonstrates that V nitrogenase becomes as efficient as Mo nitrogenase at temperatures below 10-15 degrees C. The availability of oxygen limits the activity of both enzymes at temperatures above 22 degrees C.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Food Science & Technology
Olga A. Koksharova, Ivan O. Butenko, Olga V. Pobeguts, Nina A. Safronova, Vadim M. Govorun
Summary: The study demonstrates that BMAA treatment results in imbalance of energy and metabolite levels in diazotrophic cyanobacterial cells, leading to upregulation of stress-activated proteins and affecting the expression of nitrogenase subunits involved in nitrogen fixation. These findings provide new insights into the ecological impact of BMAA on microalgal communities.
Article
Green & Sustainable Science & Technology
Shimaa M. El Shafay, Ahmed Gaber, Walaa F. Alsanie, Mostafa E. Elshobary
Summary: The study aimed to improve biomass and biochemical constituents, especially lipid production, of Anabaena variabilis and Nostoc muscorum by formulating an optimal growth condition using various concentrations of nutrients. A. variabilis was chosen for biodiesel production due to its superior lipid and protein accumulation, while N. muscorum showed the highest carbohydrate content.
Article
Microbiology
Loknath Samanta, Karin Stensjo, Peter Lindblad, Jyotirmoy Bhattacharya
Summary: This study investigates the tolerance of filamentous cyanobacteria to hydrogen peroxide (H2O2) and finds that different strains have different levels of tolerance, which is important for the selection and use of strains in biotechnological applications.
ARCHIVES OF MICROBIOLOGY
(2022)
Article
Environmental Sciences
Karolina Czarny, Barbara Krawczyk, Dominik Szczukocki
Summary: The toxic effects of bisphenol analogues, both individually and in combination, on cyanobacteria need further investigation. Different bisphenol analogues exhibit varying levels of toxicity to cyanobacteria, with mixtures potentially showing stronger toxic effects than bisphenol A.
Article
Microbiology
Hannah Schaetzle, Sergio Arevalo, Leonard Fresenborg, Hans-Michael Seitz, Enrique Flores, Enrico Schleiff
Summary: In the model cyanobacterium Anabaena sp. strain PCC 7120, TonB proteins such as TonB3 are involved in transporting ferric schizokinen, while TonB2 mutations strongly influence outer membrane integrity. The different TonB proteins appear to have distinct functions and play important roles in cellular metal concentrations and antibiotic susceptibility.
Article
Environmental Sciences
Shuaitong Liu, Ying Liu, Jian Zhang
Summary: This study investigated the effects of three commonly detected antibiotics - ciprofloxacin, tetracycline, and sulfamethoxazole - on the growth, photosynthetic activity, nitrogen-fixing capacity, and proteomic expression profiles of Nostoc sp. PCC 7120. It was found that ciprofloxacin and sulfamethoxazole stimulated cyanobacterial growth and nitrogenase synthesis, while tetracycline mainly enhanced nitrogen fixation through growth stimulation. The study also revealed that the nitrogen-fixing capacity of Nostoc sp. was closely related to the total nitrogenase concentration, which was determined by cell density and nitrogenase synthesis ability.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Article
Biochemistry & Molecular Biology
Mara Simonazzi, Laura Pezzolesi, Paola Galletti, Chiara Gualandi, Rossella Pistocchi, Nicole De Marco, Zoe Paganelli, Chiara Samori
Summary: The study successfully optimized the production conditions for PHB by the cyanobacterium Anabaena sp., demonstrating efficient PHB production under specific conditions. After large-scale cultivation, PHB accounted for 46% of the biomass, with high quality attributes.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Environmental Sciences
Mona M. Abd El-Hameed, Mohamed E. Abuarab, Nadhir Al-Ansari, Shady Abdel Mottaleb, Gomaa A. Bakeer, Yeboah Gyasi-Agyei, Ali Mokhtar
Summary: Water pollution with heavy metals, specifically Cd, is a global concern due to its impact on natural ecosystems and human health. This study evaluated the removal efficiency of Cd from contaminated aqueous solutions using two cyanobacterial strains. Results showed that N. muscorum was more efficient in removing Cd than T. variabilis, and high Cd concentrations had a more toxic impact on algal growth.
ENVIRONMENTAL SCIENCES EUROPE
(2021)
Article
Biotechnology & Applied Microbiology
Irshad Ahamad, Nafe Aziz, Almaz Zaki, Tasneem Fatma
Summary: This study successfully synthesized AgNPs using Anabaena variabilis-mediated approach, demonstrating excellent antibacterial and antifungal activity. Combined with standard antibiotics and antifungal agents, AgNPs showed significant synergistic effects.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Biochemistry & Molecular Biology
Jorge Guio, Maria Teresa Bes, Monica Balsera, Laura Calvo-Begueria, Emma Sevilla, Maria Luisa Peleato, Maria F. Fillat
Summary: FurA is a multifunctional regulator in cyanobacteria that can develop disulfide reductase activity due to lack of a structural zinc ion. The interaction between FurA and the type m thioredoxin TrxA was confirmed through in vitro and in vivo studies, suggesting TrxA as a redox partner that modulates FurA performance in facilitating interactions with different ligands.
Article
Plant Sciences
Dina A. Refaay, Mohammed Abdel-Hamid, Amal A. Alyamani, Mamdouh Abdel Mougib, Dalia M. Ahmed, Amr Negm, Amr M. Mowafy, Amira A. Ibrahim, Rania M. Mahmoud
Summary: The cyanobacteria species Anabaena variabilis showed high acetylcholinesterase inhibition, and its growth was enhanced on the modified Navicula medium. Compounds isolated from this species exhibited potential for treating Alzheimer's disease, highlighting their promising pharmacodynamics and pharmacokinetic properties.
Article
Biochemistry & Molecular Biology
Benjamin L. Springstein, Dennis J. Nurnberg, Christian Woehle, Julia Weissenbach, Marius L. Theune, Andreas O. Helbig, Iris Maldener, Tal Dagan, Karina Stucken
Summary: Filament-forming proteins play crucial roles in cellular processes such as cell division and growth. Two novel coiled-coil-rich proteins in the filament-forming cyanobacterium Anabaena assemble into heteropolymers and function in maintaining the multicellular shape. Their function is achieved through cooperation with other proteins to stabilize the cell shape.
Article
Biology
Md. Shakir Ahammed, Md. Abdul Baten, Muhammad Aslam Ali, Shahin Mahmud, Md. Sirajul Islam, Bhim Sen Thapa, Md. Aminul Islam, Md. Alim Miah, Tanmoy Roy Tusher
Summary: This study investigated the ability of microalgae and cyanobacteria to remove pollutants, especially heavy metals, from polluted river water. The results showed that both microalgae and cyanobacteria significantly reduced the pollutants and heavy metal concentrations. However, their efficiency in pollutant removal varied depending on the species.