ENGINEERED STRAIN OF ESCHERICHIA COLI FOR PRODUCTION OF POLY-R-3-HYDROXYALKANOATE POLYMERS WITH DEFINED MONOMER UNIT COMPOSITION AND METHODS BASED THEREON
申请人:The Research Foundation for The State University of New York
公开号:US20160076064A1
公开(公告)日:2016-03-17
Methods and systems for producing prescribed unit size azido-poly(3-hydroxyalkanoate) (azido-PHA) polymers and copolymers are provided. The methods and systems can employ recombinant bacteria that are not native producers of PHA or lack enzymes to degrade PHA once synthesized, metabolize short to long chain fatty acids without induction, and express an (R)-specific enoyl-CoA hydratase and a PHA synthase, the (R)-specific enoyl-CoA hydratase and PHA synthase having wide substrate specificities. The recombinant bacteria are fed at least one ω-azidofatty acid substrate that is equal in carbon length to the prescribed or desired unit size of an azido-PHA polymer to be produced. Azido-PHA polymers or azido-PHA co-polymers can be conjugated via copper-catalyzed alkyne-azide cycloaddition (CuAAC) or strain-promoted azide-alkyne cycloaddition (SPAAC) reactions. The prescribed unit size conjugated azido-PHA polymer or orthogonally conjugated azido-PHA co-polymer that is produced is then isolated and/or purified.
Engineered strain of Escherichia coli for production of poly-R-3-hydroxyalkanoate polymers with defined monomer unit composition and methods based thereon
申请人:The Research Foundation for The State University of New York
公开号:US10005880B2
公开(公告)日:2018-06-26
Methods and systems for producing prescribed unit size azido-poly(3-hydroxyalkanoate) (azido-PHA) polymers and copolymers are provided. The methods and systems can employ recombinant bacteria that are not native producers of PHA or lack enzymes to degrade PHA once synthesized, metabolize short to long chain fatty acids without induction, and express an (R)-specific enoyl-CoA hydratase and a PHA synthase, the (R)-specific enoyl-CoA hydratase and PHA synthase having wide substrate specificities. The recombinant bacteria are fed at least one ω-azidofatty acid substrate that is equal in carbon length to the prescribed or desired unit size of an azido-PHA polymer to be produced. Azido-PHA polymers or azido-PHA co-polymers can be conjugated via copper-catalyzed alkyne-azide cycloaddition (CuAAC) or strain-promoted azide-alkyne cycloaddition (SPAAC) reactions. The prescribed unit size conjugated azido-PHA polymer or orthogonally conjugated azido-PHA co-polymer that is produced is then isolated and/or purified.
Tailored Biosynthesis of Olefinic Medium-Chain-Length Poly[(<i>R</i>)-3-hydroxyalkanoates] in <i>Pseudomonas </i><i>p</i><i>utida</i> GPo1 with Improved Thermal Properties
Mixtures of 5-phenylvalerate, octanoate, and 10-undecenoate were fed to a chemostat culture (dilution rate = 0.1 h(-1)) of Pseudomonas putida GPo1 under well-defined dual-(C,N)-nutrient limited growth conditions. Five new, tailor-made copolymers were produced and consisted of poly(3-hydroxy-5-phenylvalerate-co-3-hydroxyalkanoates-co-3-hydroxy-omega-alkenoates), poly(HP-co-HA-co-HE), with increasing amounts of aromatic side chains (A, 0%; B, 3%; C, 19%; D, 42%; and E, 59%), approximately 10 mol % unsaturated side chains, and decreasing amounts of saturated side chains. On the basis of NMR analysis of polymer E, it was concluded that the incorporation of the substrates occurred randomly. The HP-content determined the glass transition temperature, which increased linearly from -38.7 degreesC for poly-(0%HP-co-90%HA-co-10%HE) to -6.0 degreesC for poly(59%HP-omega-31%HA-co-10%HE).
ENGINEERED STRAIN OF ESCHERICHIA COLI FOR PRODUCTION OF POLY-R-3 HYDROXYALKONOATE POLYMERS WITH DEFINED MONOMER UNIT COMPOSITION AND METHODS BASED THEREON.
申请人:Suny Research Foundation
公开号:EP2812438B1
公开(公告)日:2019-03-13
Biocatalytic Enantioselective β‐Hydroxylation of Unactivated C−H Bonds in Aliphatic Carboxylic Acids
作者:Kun Zhang、Aiqin Yu、Xuan Chu、Fudong Li、Juan Liu、Lin Liu、Wen‐Ju Bai、Chao He、Xiqing Wang
DOI:10.1002/anie.202204290
日期:2022.7.11
Directed evolution rendered P450BSβ capable of β-hydroxylating unactivated C−H bonds in aliphatic carboxylicacids with broad substrate scope and excellent chemo-, regio-, and enantioselectivity. The crystal structure of the evolved variant rationalizes the improved reactivity and selectivity. This study demonstrates the potential of exploring biocatalysts to fulfill reactions that are otherwise elusive