Pactamycin, produced by the soil bacterium Streptomyces pactum, is a cytotoxic antibiotic that belongs to the aminocyclitol family of natural products. This antibiotic has shown various forms of biological activity, including antibacterial, antifungal, antimalarial, and antitumor activities. Despite its outstanding biological activity, the mode of formation of its pharmacophore (the...
Pseudomonas fluorescens NZI7 was first isolated from a New Zealand mushroom farm in 2001. This Gram-negative bacteria can cause brown blotch disease in the basidiomycete mushroom Agaricus bisporus. P. fluorescens NZI7 can also repel grazing by the nematode Caenorhabditis elegans, a natural predator of P. fluorescens NZI7. Potentially implicated in...
A gene cluster responsible for the biosynthesis of the antitumor agent
cetoniacytone A was identified in Actinomyces sp. strain Lu 9419, an
endosymbiotic bacteria isolated from the intestines of the rose chafer beetle. The
nucleotide sequence analysis of the 26 Kb DNA region revealed the presence of 17
complete ORFs,...
Sunscreen products are used worldwide to protect the skin from ultraviolet radiation. However, some of the ingredients used in sunscreen products are fatal to coral reefs especially in areas where tourism is a large part of the economy. In this study, we explored a synthetic route to produce 4-deoxygadusol, which...
Sugar phosphate cyclases (SPCs) are enzymes involved in the biosynthesis of many important natural products. SPCs form a unique cyclitol during the early steps in the biosynthesis of many natural products. These natural products include rifamycin, which is chemically modified to rifampicin and used clinically as an antituberculosis drug, and...
The purpose of this project was to isolate gabosines and other compounds through chemical screening of secondary metabolites of Streptomyces cellulosae subsp. griseorubiginoses strain S1096. Two different media were used to cultivate S. cellulosae. The first contained soybean and mannitol. The other contained oatmeal and trace element solution. After cultivation...
According to the Center for Disease Control and Prevention (CDC), in 2015 10.4 million people worldwide became infected with tuberculosis (TB) with 1.8 million TB related deaths. Tuberculosis is a bacterial infectious disease caused by Mycobacterium tuberculosis, a slow growing yet highly infectious bacterium. Among the first line of treatments...
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TaifoMahmud
According to the Center for Disease Control and Prevention (CDC), in 2015
Natural products isolated from bacteria can be developed into new therapeutic agents. The soil bacteria actinomycetes, specifically the Streptomyces species, are prolific producers of antibiotics. This thesis is composed of two projects which focus on novel drug discovery from soil bacteria collected from the Indonesian Black Water Ecosystem (the ICBB...
This thesis describes an investigation of the molecular basis of the substrate specificity and catalytic mechanism of a unique pseudoglycosyltransferase (PsGT) enzyme, VldE. PsGTs are a newly discovered group of glycosyltransferase (GT)-like proteins that catalyze the transfer of a pseudosugar to an acceptor molecule via a C-N bond formation. This...
Ribomimetic natural products have long been known for their important biological activities. Structurally, they contain a densely functionalized cyclopentane unit that resembles ribose. Pactamycin, the prominent member of this class of natural products, is a potent protein synthesis inhibitor produced by the soil bacterium Streptomyces pactum. In pactamycin, the aminocyclopentitol...