9ive

Structure of wild-type aminotransferase from Mycolicibacterium neoaurum in complex with LLP and ALA

spinqualitylabelsall models 9ive, resolution 1.93Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9ive is a 4 chain structure with sequence from Mycolicibacterium neoaurum VKM Ac-1815D. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.93Å Ligands: ALA, LLP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function V5X927_MYCNE Publication Abstract from PubMed (R)-selective amine transaminases (R-ATAs) show considerable potential for the asymmetric synthesis of chiral drug intermediates. However, the low catalytic efficiency of natural R-ATAs toward bulky ketone substrates, such as N-heterocyclic compounds, severely limits its industrial application. In this study, five putative (R)-ATAs were mined from NCBI database, among which MnTA showed the highest activity for N-Boc-3-pyrrolidinone (1a) and N-Boc-3-piperidone (2a), and its crystal structure was performed. Furthermore, a structure-guided engineering strategy combined with directed evolution and in silico design was executed. Four key sites for substrate binding were identified based on alanine scanning. Then, a saturated mutation library was constructed, and residues G66 and F127 were found to be the key sites affecting substrate binding. By further combining mutation and iterative saturation mutation, variants with markedly improved activity were obtained. The optimal mutant MnTA-M1 (F127M) and MnTA-M5 (G66L/H67N/F127M/L160I) also displayed significantly enhanced activity toward various cyclic ketones or bulky N-heterocyclic ketone analogs. Finally, the gram-scale synthesis of (R)-3-amino-N-Boc-pyrrolidin (1b) and (R)-3-amino-N-Boc-piperidine (2b) was performed by the best mutants, achieving the space-time yields (STY) of 108 and 214 g/L.d, respectively. This research provides efficient biocatalysts for the synthesis of various chiral N-heterocyclic amines, along with a structural insight into the molecular mechanism for enhanced catalytic performance. Structure-guided engineering an (R)-transaminase from Mycobacterium neoaurum for efficient synthesis of chiral N-heterocyclic amines.,Gao X, Zhang W, Wei X, Zhao L, Che C, Zhang Z, Wei H, Qin B, Liu W, Jia X, You S Int J Biol Macromol. 2024 Dec 10;287:138591. doi: 10.1016/j.ijbiomac.2024.138591. PMID:39667461 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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