Summary
Twenty-four different strains of aerobic Gram-negative bacteria, mainly belonging to the genera Alcaligenes, Paracoccus, Pseudomonas and Methylobacterium, were examined with respect to their ability to utilize 4-hydroxyvaleric acid (4HV), 4-valerolactone (4VL) and 3-hydroxypropionic acid (3HP) as carbon sources for growth and for accumulation of polyhydroxyalkanoic acid (PHA). A gas chromatographic (GC) method for the detection of 3-hydroxyalkanoic acid methyl esters has been extended for the detection of derivatives obtained from the methanolysis of 4-hydroxybutyric acid (4HB) and 4HV. Most of the Alcaligenes species and P. oxalaticus Ox1 accumulated a terpolyester consisting of 3-hydroxybutyric acid (3HB), 3-hydroxyvaleric acid (3HV) and 4HV as constituents from 4HV or 4VL as sole carbon sources in batch, fed-batch or two-stage fed-batch cultures. Poly(3HB-co-3HV-co-4HV) accumulated from 4HV by A. eutrophus strain NCIB 11599 amounted to approximately 50% of the cell dry matter and was composed of 42.0 mol % 3HB, 52.2 mol % 3HV and 5.6 mol % 4HV, respectively. Pseudomonads, which belong to the rRNA homology group I, were not able to incorporate 4HV. With 3HP as carbon source, the GC analysis provided evidence for the presence of 3HP in the PHA of many bacteria. Nuclear magnetic resonance spectroscopic analysis confirmed that, for example, A. eutrophus strain TF93 accumulated poly(3HB-co-3HP) with 98 mol % 3HB and 2 mol % 3HP if the cells were cultivated in the presence of 0.5% (w/v) 3HP.
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Valentin, H.E., Schönebaum, A. & Steinbüchel, A. Identification of 4-hydroxyvaleric acid as a constituent of biosynthetic polyhydroxyalkanoic acids from bacteria. Appl Microbiol Biotechnol 36, 507–514 (1992). https://doi.org/10.1007/BF00170193
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DOI: https://doi.org/10.1007/BF00170193