Pterins of the cyanobacterium Aphanizomenon flos-aquae
The cyanobacterium Alphanizomenon flos-aquae contains various glycosides of a pterin that had previously been tentatively identified as 6-(threo-1,2-dihydroxypropyl)-pterin. The pterin is now identified as 6-(l-threo-1,2-dihydroxypropyl)pterin(6-l-threo-biopterin) by NMR and mass spectrometry, thinchromatographic comparisons with authentic samples and by optical rotation. The 6-l-threo-biopterin glycoside-1 from toxic strain NH-1 gave rise to xylose and glucose on hydrolysis, whereas its glycoside-2 from Cambridge Collection and nontoxic NH-1 strains gave mannose and glucose. This pterin may be a useful marker for certain species of cyanobacteria.
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Ikawa, M., Sasner, J., Haney, J., Foxall, T. Pterins of the cyanobacterium Aphanizomenon flos-aquae. Phytochemistry, Volume 38, Issue 5, March, 1995. pp. 1229-1232. doi:10.1016/0031-9422(94)00775-O