9h5p

Crystal structure of Thermoanaerobacterales bacterium monoamine oxidase in complex with putrescine

spinqualitylabelsall models 9h5p, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9h5p is a 2 chain structure with sequence from Thermoanaerobacterales bacterium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.3Å Ligands: FAD, MG, PUT Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0AAJ6N6J2_9FIRM Publication Abstract from PubMed Bacterial monoamine oxidases (MAOs) are FAD-dependent proteins catalyzing a relevant reaction for many industrial biocatalytic applications, ranging from production of enantiomerically pure building blocks for pharmaceutical synthesis to biosensors for monitoring food and beverage quality. The thermostable MAO enzyme from Thermoanaerobacterales bacterium (MAO(Tb)) is about 36 % identical to both putrescine oxidase and human MAOs and can be efficiently produced in Escherichia coli. MAO(Tb) preferentially acts on n-alkyl monoamines but shows detectable activity also on polyamines and aromatic monoamines. The crystal structures of MAO(Tb) in complex with putrescine, benzylamine, spermidine and n-heptylamine at resolution ranging from 1.6 to 2.3 A resolution revealed the binding mode of substrates to the enzyme. The MAO(Tb) active site is highly conserved in the inner part of the cavity in front of the flavin ring (re face), where the presence of two tyrosine residues creates the substrate amine binding site that is found also in human MAOs. Instead, more distantly from the flavin, the entrance of the catalytic site is much more open in MAO(Tb) and features a different arrangement of amino acids. Site-directed mutagenesis targeting residues Ala168, Thr199 and Val324 allowed the identification of key residues in ligand binding to alter substrate specificity. The A168D variant showed a higher activity on putrescine than wild-type, whereas by replacing either Thr199 or Val324 to Trp a marked enhancement in k(cat)/K(M) values was found on n-alkyl-monoamines and on aromatic amines. Altering substrate specificity of a thermostable bacterial monoamine oxidase by structure-based mutagenesis.,Basile L, Poli C, Santema LL, Lesenciuc RC, Fraaije MW, Binda C Arch Biochem Biophys. 2025 Feb;764:110276. doi: 10.1016/j.abb.2024.110276. Epub , 2024 Dec 18. PMID:39706511 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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