4BA4

Crystal structure of the apo omega-transaminase from Chromobacterium violaceum

Summary for 4BA4

• Entry DOI: 10.2210/pdb4ba4/pdb
• Related: 4A6R 4A6T 4A6U 4A72 4AH3 4BA5
• Descriptor: AMINOTRANSFERASE, SULFATE ION (3 entities in total)
• Functional Keywords: transferase
• Biological source: CHROMOBACTERIUM VIOLACEUM
• Total number of polymer chains: 2
• Total formula weight: 102654.65

Authors

Sayer, C.,Isupov, M.N.,Littlechild, J.A. (deposition date: 2012-09-11, release date: 2013-03-27, Last modification date: 2023-12-20)

Primary citation

Sayer, C.,Isupov, M.N.,Westlake, A.,Littlechild, J.A.
Structural Studies with Pseudomonas and Chromobacterium [Omega]-Aminotransferases Provide Insights Into Their Differing Substrate Specificity.
Acta Crystallogr.,Sect.D, 69:564-, 2013

PubMed Abstract: The crystal structures and inhibitor complexes of two industrially important ω-aminotransferase enzymes from Pseudomonas aeruginosa and Chromobacterium violaceum have been determined in order to understand the differences in their substrate specificity. The two enzymes share 30% sequence identity and use the same amino acceptor, pyruvate; however, the Pseudomonas enzyme shows activity towards the amino donor β-alanine, whilst the Chromobacterium enzyme does not. Both enzymes show activity towards S-α-methylbenzylamine (MBA), with the Chromobacterium enzyme having a broader substrate range. The crystal structure of the P. aeruginosa enzyme has been solved in the holo form and with the inhibitor gabaculine bound. The C. violaceum enzyme has been solved in the apo and holo forms and with gabaculine bound. The structures of the holo forms of both enzymes are quite similar. There is little conformational difference observed between the inhibitor complex and the holoenzyme for the P. aeruginosa aminotransferase. In comparison, the crystal structure of the C. violaceum gabaculine complex shows significant structural rearrangements from the structures of both the apo and holo forms of the enzyme. It appears that the different rigidity of the protein scaffold contributes to the substrate specificity observed for the two ω-aminotransferases.

PubMed: 23519665
DOI: 10.1107/S0907444912051670

Experimental method

X-RAY DIFFRACTION (1.73 Å)