3,5-Dibromo-4-carbamoylbenzoic acid 2-propanol monosolvate

In the title solvated crystal, C8H5Br2NO3·C3H8O, the acid molecules form inversion dimers by pairwise N—H...O hydrogen bonds between carbamoyl groups and the carboxyl and carbamoyl groups link to form head-to-tail inversion dimers. The 2-propanol hydroxyl group interposes between adjacent head-tail pairs, resulting in C 3 3(10) chains of hydrogen bonds propagating along [100]. The molecules of 2-propanol are disordered over two sets of sites in a 0.598 (8):0.402 (8) ratio. The best-fit planes of the carbamoyl group and benzene ring are inclined by 88.26 (11)°. This is a greater inclination than was previously reported with CH3, Cl, F or H in place of the Br atoms, although those analogues did not have a para carboxyl group.

Abnormal co-enzymatic behavior of a one-electron reduced bipyridinium salt with a carbamoyl group on the catalytic activity of CO2 reduction by formate dehydrogenase

A carbamoyl-modified bipyridinium salt has an enhancement and deactivation behaviour on the catalytic activity of CO2 reduction by formate dehydrogenase (FDH) from Candida boidinii.

Structure ofSaccharomyces cerevisiaemitochondrial Qri7 in complex with AMP

N6-Threonylcarbamoyladenosine (t6A) is a modified tRNA base required for accuracy in translation. Qri7 is localized in yeast mitochondria and is involved in t6A biosynthesis. In t6A biosynthesis, threonylcarbamoyl-adenylate (TCA) is synthesized from threonine, bicarbonate and ATP, and the threonyl-carbamoyl group is transferred to adenine 37 of tRNA by Qri7. Qri7 alone is sufficient to catalyze the second step of the reaction, whereas the Qri7 homologues YgjD (in bacteria) and Kae1 (in archaea and eukaryotes) function as parts of multi-protein complexes. In this study, the crystal structure of Qri7 complexed with AMP (a part of TCA) has been determined at 2.94 Å resolution in a new crystal form. The manner of AMP recognition is similar, with some minor variations, among the Qri7/Kae1/YgjD family proteins. The previously reported dimer formation was also observed in this new crystal form. Furthermore, a comparison with the structure of TobZ, which catalyzes a similar reaction to t6A biosynthesis, revealed the presence of a flexible loop that may be involved in tRNA binding.