Abstract
Overexpression of the gene encoding the poly-3-hydroxy-n-phenylalkanoate (PHPhA) depolymerase (phaZ) in Pseudomonas putida U avoids the accumulation of these polymers as storage granules. In this recombinant strain, the 3-OH-acyl-CoA derivatives released from the different aliphatic or aromatic poly-3-hydroxyalkanoates (PHAs) are catabolized through the β-oxidation pathway and transformed into general metabolites (acetyl-CoA, succinyl-CoA, phenylacetyl-CoA) or into non-metabolizable end-products (cinnamoyl-CoA). Taking into account the biochemical, pharmaceutical and industrial interest of some PHA catabolites (i.e., 3-OH-PhAs), we designed a genetically engineered strain of P. putida U (P. putida U ΔfadBA-phaZ) that efficiently bioconverts (more than 80%) different n-phenylalkanoic acids into their 3-hydroxyderivatives and excretes these compounds into the culture broth.
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Acknowledgements
This investigation was supported by the Comisión Interministerial de Ciencia y Tecnología (CICYT), Madrid, Spain (grant BIO2003-05309-C04-01). A.S. and E.A. are recipients of fellowships from the Universidad de León and CICYT, respectively.
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Appendix
NMR data for 3-hydroxy-5-phenylpentanoic acid
1H NMR (CDCl3): δ=1.74 (m; 2H, H-4) 2.45 (m; 2H, H-2), 2.74 (m; 2H, H-5), 4.05 (s, broad; 1H, H-3), 7.17–7.27 (m; 5H, aromatic H). 13C NMR (CDCl3): δ=32.09 (C-5), 37.56 (C-4), 41.27 (C-2), 67.38(C-3), 125.60 (C-4′), 128.31(C-2′, C-6′), 128.21 (C-3′, C-5′), 141.55 (C-1′), 175.97 (C-1).
NMR data for 3-hydroxy-6-phenylhexanoic acid
1H NMR (CDCl3): δ=1.55 (m; 2H, H-4), 1.68–1.81 (m; 2H, H-5), 2.54 (m; 2H, H-2), 2.66 (m; 2H, H-6), 4.08 (s, broad; 1H, H-3), 7.30–7.20 (m; 5H, aromatic H). 13C NMR (CDCl3): δ=27.50 (C-5), 35.86 (C-6), 36.12 (C-4), 41.41 (C-2), 68.20 (C-3), 126.10 (C-4′), 128.67 (C-2′, C-6′), 128.62 (C-3′, C-5′), 142.32 (C-1′), 178.39 (C-1).
NMR data for 3-hydroxy-7-phenylheptanoic acid
1H NMR (CDCl3): δ=1.39–1.49 (m, 2H, H-5), 1.53 (m; 2H, H-4), 1.65 (m, 2H, H-6), 2.47 (m; 2H, H-2), 2.62 (m; 2H, H-7), 4.05 (s, broad; 1H, H-3), 7.17–7.27 (m; 5H, aromatic H). 13C NMR (CDCl3): δ=25.10 (C-5), 31.30 (C-6), 35.79 (C-7), 36.28 (C-4), 41.18 (C-2), 68.04(C-3), 125.66 (C-4′), 128.36 (C-2′, C-6′), 128.26 (C-3′, C-5′), 142.45 (C-1′), 176.04 (C-1).
NMR data for 3-hydroxy-8-phenyloctanoic acid
1H NMR (CDCl3): δ=1.36 (m; 2H, H-6), 1.37–1.47 (m; 2H, H-5), 1.47–1.53 (m; 2H, H-4), 1.63 (m; 2H, H-7), 2.51 (m; 2H, H-2), 2.63 (m; 2H, H-8), 4.03 (s, broad; 1H, H-3), 7.18–7.28 (m; 5H, aromatic H). 13C NMR (CDCl3): δ=25.29 (C-5), 29.07 (C-6), 31.35 (C-7), 35.83 (C-8), 36.30 (C-4), 41.09 (C-2), 68.02 (C-3), 125.63 (C-4′), 128.39 (C-2′, C-6′), 128.25 (C-3′, C-5′), 142.62 (C-1′), 178.06 (C-1).
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Sandoval, Á., Arias-Barrau, E., Bermejo, F. et al. Production of 3-hydroxy-n-phenylalkanoic acids by a genetically engineered strain of Pseudomonas putida. Appl Microbiol Biotechnol 67, 97–105 (2005). https://doi.org/10.1007/s00253-004-1752-x
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DOI: https://doi.org/10.1007/s00253-004-1752-x