Transcript analysis of the extended hyp-operon in the cyanobacteria Nostoc sp. strain PCC 7120 and Nostoc punctiforme ATCC 29133

Identification of sesquiterpene synthases from Nostoc punctiforme PCC 73102 and Nostoc sp. strain PCC 7120.

Cyanobacteria are a rich source of natural products and are known to produce terpenoids. These bacteria are the major source of the musty-smelling terpenes geosmin and 2-methylisoborneol, which are found in many natural water supplies; however, no terpene synthases have been characterized from these organisms to date. Here, we describe the characterization of three sesquiterpene synthases ident...

Molecular genetics and genomic analysis of scytonemin biosynthesis in Nostoc punctiforme ATCC 29133.

The indole-alkaloid scytonemin is the most common and widespread sunscreen among cyanobacteria. Previous research has focused on its nature, distribution, ecology, physiology, and biochemistry, but its molecular genetics have not been explored. In this study, a scytonemin-deficient mutant of the cyanobacterium Nostoc punctiforme ATCC 29133 was obtained by random transposon insertion into open r...

Gas exchange in the filamentous cyanobacterium Nostoc punctiforme strain ATCC 29133 and Its hydrogenase-deficient mutant strain NHM5.

Nostoc punctiforme ATCC 29133 is a nitrogen-fixing, heterocystous cyanobacterium of symbiotic origin. During nitrogen fixation, it produces molecular hydrogen (H(2)), which is recaptured by an uptake hydrogenase. Gas exchange in cultures of N. punctiforme ATCC 29133 and its hydrogenase-free mutant strain NHM5 was studied. Exchange of O(2), CO(2), N(2), and H(2) was followed simultaneously with ...

Transcriptional regulation of two putative proteases in the cyanobacteria Nostoc sp. PCC 7120

Nucleotide sequence of an operon in Nostoc sp. strain ATCC 29133 encoding four genes of the oxidative pentose phosphate cycle.

Cyanobacteria are characterized as oxygenic photoautotrophs and use the reductive pentose phosphate (CalvinBenson) cycle in assimilation of C02. Based on enzyme assays and isotopic labeling experiments, a11 cyanobacteria are assumed to use reactions of the oxidative pentose phosphate pathway to generate reductant for maintenance energy in the dark period of natural diel cycles (Smith, 1983). In...