6hx9 | pdb_00006hx9
Putrescine transaminase from Pseudomonas putida
Structural highlights
Publication Abstract from PubMedThe reductive amination of prochiral ketones using biocatalysts has been of great interest to the pharmaceutical industry in the last decade for integrating novel strategies in the production of chiral building blocks with the intent of minimizing impact on the environment. Amongst the enzymes able to catalyze the direct amination of prochiral ketones, pyridoxal 5'-phosphate (PLP) dependent omega-transaminases have shown great promise as versatile industrial biocatalysts with high selectivity, regioselectivity, and broad substrate scope. Herein the biochemical characterization of a putrescine transaminase from Pseudomonas putida (Pp-SpuC) was performed, which showed an optimum pH and temperature of 8.0 and 60 degrees C, respectively. To gain further structural insight of this enzyme, we crystallized the protein in the apo form and determined the structure to 2.1 A resolution which revealed a dimer that adopts a class I transaminase fold comparable to other class III transaminases. Furthermore we exploited its dual substrate recognition for biogenic diamines (i.e., cadaverine) and readily available monoamines (i.e., isopropylamine) for the synthesis of benzylamine derivatives with excellent product conversions and extremely broad substrate tolerance. Characterization of a Putrescine Transaminase From Pseudomonas putida and its Application to the Synthesis of Benzylamine Derivatives.,Galman JL, Gahloth D, Parmeggiani F, Slabu I, Leys D, Turner NJ Front Bioeng Biotechnol. 2018 Dec 21;6:205. doi: 10.3389/fbioe.2018.00205., eCollection 2018. PMID:30622946[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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