The Structure and Mechanism of the Mycobacterium Tuberculosis Cyclodityrosine Synthetase.
Vetting, M.W., Hegde, S.S., Blanchard, J.S.(2010) Nat Chem Biol 6: 797
- PubMed: 20852636 
- DOI: https://doi.org/10.1038/nchembio.440
- Primary Citation of Related Structures:  
2X9Q - PubMed Abstract: 
The Mycobacterium tuberculosis enzyme Rv2275 catalyzes the formation of cyclo(L-Tyr-L-Tyr) using two molecules of Tyr-tRNA(Tyr) as substrates. The three-dimensional (3D) structure of Rv2275 was determined to 2.0-Å resolution, revealing that Rv2275 is structurally related to the class Ic aminoacyl-tRNA synthetase family of enzymes. Mutagenesis and radioactive labeling suggests a covalent intermediate in which L-tyrosine is transferred from Tyr-tRNA(Tyr) to an active site serine (Ser88) by transesterification with Glu233 serving as a critical base, catalyzing dipeptide bond formation.
Organizational Affiliation: 
Department of Biochemistry, Albert Einstein College of Medicine, Bronx, New York, USA.