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Research Article

ANTIBIOTIC BIOSYNTHESIS AND SECONDARY METABOLISM IN HIGH-YIELDING STRAINS OF STREPTOMYCES, PENICILLIUM CHRYSOGENUM AND ACREMONIUM CHRYSOGENUM

In this article, the secondary metabolism as a basis for antibiotics production by industrial strains of Streptomyces, Penicillium chrysogenum and Acremonium chrysogenum is discussed. Images from transmission electron microscopy reveal some important features of the mycelial cells which are related to antibiotics biosynthesis. This discovery is important for further industrial strain improvement and has economic significance. Possibilities of new strategies for antimicrobial treatment are

Wiesław Kurzątkowski, Joanna Kuczerowska

Postępy Mikrobiologii - Advancements of Microbiology , ISSUE 4, 422–428

Article

NEW DATA ON ISOPENICILLIN N SYNTHASE AND PEROXISOME CO-LOCATION IN THE HYPHAL CELLS OF PENICILLIUM CHRYSOGENUM PQ-96 – PEXOPHAGY AND EXOCYTOSIS

1. Introduction The discovery and industrial production of penicillin G by high-yielding Penicillium chrysogenum strains was a great success which allowed to open the era of antibiotic therapy. Penicillin G has saved millions of human beings from annihilation. The β-lactams are some of the oldest and most widely used antibiotics in human society. In industrial strains penicillin G is secreted in amounts of 45–50 g per liter of the fermentation broth. The biosynthesis and secretion of such

Wiesław Kurzątkowski, Paulina Górska, Małgorzata Główka, Katarzyna Woźnica, Aleksandra Zasada

Postępy Mikrobiologii - Advancements of Microbiology , ISSUE 1, 80–85

Original Paper

Characterization and Optimization of Biosynthesis of Bioactive Secondary Metabolites Produced by Streptomyces sp. 8812

The nutritional requirements and environmental conditions for a submerged culture of Streptomyces sp. 8812 were determined. Batch and fed-batch Streptomyces sp. 8812 fermentations were conducted to obtain high activity of secondary metabolites. In the study several factors were examined for their influence on the biosynthesis of the active metabolites-7-hydroxy-6-oxo-2,3,4,6-tetrahydroisoquinoline-3-carboxyl acid (C10H9NO4) and N-acetyl-3,4-dihydroxy-l-phenylalanine (C11H13NO5): changes in

Aleksandra Rajnisz, Adam Guśpiel, Magdalena Postek, Joanna Ziemska, Anna Laskowska, Daniel Rabczenko, Jolanta Solecka

Polish Journal of Microbiology , ISSUE 1, 51–61

original-paper

Thermoregulation of Prodigiosin Biosynthesis by Serratia marcescens is Controlled at the Transcriptional Level and Requires HexS

metabolite is regulated can be useful for industrial prodigiosin production as well as giving insight into how the organism interacts with the environment. A variety of transcription factors and environmental stimuli have been shown to influence prodigiosin biosynthesis (Williamson et al. 2006). Among the earliest described is thermoregulation of prodigiosin production by S. marcescens (Blizzard and Peterson 1963; Williams et al. 1965; Tanaka et al. 2004). At 37°C pigment biosynthesis is strongly

ERIC G. ROMANOWSKI, KARA M. LEHNER, NATALIE C. MARTIN, KRIYA R. PATEL, JAKE D. CALLAGHAN, NICHOLAS A. STELLA, ROBERT M.Q. SHANKS

Polish Journal of Microbiology , ISSUE 1, 43–50

research-article

De novo transcriptome sequencing and analysis of Anisakis pegreffii (Nematoda: Anisakidae) third-stage and fourth stage larvae

U-Hwa Nam, Jong-Oh Kim, Jeong-Ho Kim

Journal of Nematology , 1–16

Article

BIOSYNTHESIS AND THE POSSIBILITY OF USING ECTOINE AND HYDROXYECTOINE IN HEALTH CARE

from 1,4,5,6-tetrahydro-2-methyl-4-pyrimidine carboxylic acid by the presence of a hydroxyl group at one of the carbon atoms in the aromatic ring. In all probability, microorganisms exposed to high temperature stress produce mainly hydroxyectoine [78]. In the case of salt stress, it was shown that the biosynthesis of hydroxyectoine occurs much later than the one of ectoine. This was confirmed by proving that the expression of the ectABC genes responsible for ectoine synthesis occurs earlier than

Weronika Goraj, Zofia Stępniewska, Anna Szafranek-Nakonieczna

Postępy Mikrobiologii - Advancements of Microbiology , ISSUE 3, 339–349

Original Paper

Emodin Reduces the Activity of (1,3)-β-D-glucan Synthase from Candida albicans and Does Not Interact with Caspofungin

Abstract Candidiasis is the most common opportunistic yeast infection, with Candida albicans as a paramount causative species. (1,3)-β-D-glucan is one of the three main targets of clinically available antifungal agents used to treat Candida infections. It is one of the most abundant fungal cell wall components. Echinocandins represent the newest class of antifungals affecting cell wall biosynthesis through non-competitive inhibition of (1,3)-β-D-glucan synthase. Therefore, treatment with

MONIKA JANECZKO

Polish Journal of Microbiology , ISSUE 4, 463–470

Research paper

Impact of recurrent hypoglycemic stress on hindbrain A2 nerve cell energy metabolism and catecholamine biosynthesis: modulation by estradiol

Pratistha Tamrakar, Karen P. Briski

Acta Neurobiologiae Experimentalis , ISSUE 1, 31–44

Original Paper

Epilithic Biofilms in Lake Baikal: Screening and Diversity of PKS and NRPS Genes in the Genomes of Heterotrophic Bacteria

underwent phylogenetic analysis of 16S rRNA genes. The identification of PKS and NRPS genes in the strains investigated was demonstrated among the homologues the genes involved in the biosynthesis of antibiotics (bacillaene, difficidine, erythromycin, bacitracin, tridecaptin, and fusaricidin), biosurfactants (iturin, bacillomycin, plipastatin, fengycin, and surfactin) and antitumor agents (epothilone, calyculin, and briostatin). Bacillus spp. 9A and 2A strains showed the highest diversity of PKS and

ELENA SUKHANOVA, EKATERINA ZIMENS, OKSANA KALUZHNAYA, VALENTINA PARFENOVA, OLGA BELYKH

Polish Journal of Microbiology , ISSUE 4, 501–516

original-paper

The Influence of Temperature and Nitrogen Source on Cellulolytic Potential of Microbiota Isolated from Natural Environment

. The reaction was stopped by adding 1.5 ml of DNS reagent and the samples were heated for 5 min in boiling water. The amount of reducing sugar was determined by measuring absorbance at 540 nm. In these tests, the enzyme production was estimated using glucose standard and was defined in units (U). One unit (U) of enzyme activity was expressed as the amount of enzyme, which released 1µmol of reducing sugars equivalent to glucose per ml per minute (Adney and Baker 1996). Optimization of biosynthesis

AGNIESZKA WITA, WOJCIECH BIAŁAS, RADOSŁAW WILK, KATARZYNA SZYCHOWSKA, KATARZYNA CZACZYK

Polish Journal of Microbiology , ISSUE 1, 105–114

Article

POLY-3-HYDROXYBUTYRATE AS AN EXAMPLE OF A BIOPOLYMER PRODUCED BY METHANOTROPHIC BACTERIA

particularly effective in the biosynthesis of poly-3-hydroxybutyrate, has been carried out for over 20 years. 2. General characteristic of methanotrophic bacteria In the rich and largely unidentified bacterial flora inhabiting the surroundings of geological deposits, one can find representatives of various groups of microorganisms. In samples obtained from hard coal deposits and salt, methanotrophic bacteria have been increasingly identified by specialists in the field of environmental biotechnology as

Adam Kubaczyński, Anna Pytlak, Zofia Stępniewska

Postępy Mikrobiologii - Advancements of Microbiology , ISSUE 3, 329–338

Research Article

UNDERGROUND COMMUNICATION – THE NEW ELEMENTS OF SIGNALLING PATHWAYS OF ARBUSCULAR MYCORRHIZAL SYMBIOSIS

) and also its product, mevalonic acid (MVA), play an essential role in the biosynthesis of sterols and isoprenoids in a plant cell. The recent studies indicate that these compounds may also play a very important role during establishing of the symbiotic mycorrhizal relationship. It is believed that MVA detects and transmits MycF factor to a cell nucleus of a host-plant triggering numerous necessary mechanisms in the plant cell to activate next steps of the mycorrhizal symbiosis. The discovery of

Katarzyna Jas, Urszula Małolepsza

Postępy Mikrobiologii - Advancements of Microbiology , ISSUE 3, 275–281

Research Article

CHARACTERISTICS AND POTENTIAL APPLICATIONS OF CIRCULAR BACTERIOCINS

enzymes and provides great thermal and pH stability. Circular bacteriocins are divided into 2 subgroups based on their physicochemical properties and sequence identity. These bacteriocins are synthesized as linear precursors with a leader sequence which is cleaved off during maturation. The mature circular peptides are composed of 58–70 amino acid residues. Biosynthesis of circular bacteriocins requires three stages: cleavage of the leader sequence, circularization and export out of the cell

Urszula Błaszczyk, Kamila Dąbrowska

Postępy Mikrobiologii - Advancements of Microbiology , ISSUE 4, 451–464

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