4TTV

Crystal structure of human ThrRS complexing with a bioengineered macrolide BC194

Summary for 4TTV

• Entry DOI: 10.2210/pdb4ttv/pdb
• Descriptor: Threonine--tRNA ligase, cytoplasmic, (1R,2R)-2-[(2S,6E,8R,9S,11R,13S,15S,16S)-7-cyano-8,16-dihydroxy-9,11,13,15-tetramethyl-18-oxooxacyclooctadec-6-en-2-yl]cyclobutanecarboxylic acid, ZINC ION, ... (4 entities in total)
• Functional Keywords: trna, synthetase, inhibitor, macrolide, ligase-antibiotic complex, ligase/antibiotic
• Biological source: Homo sapiens (Human)
• Total number of polymer chains: 4
• Total formula weight: 195815.89

Authors

Fang, P.,Guo, M. (deposition date: 2014-06-23, release date: 2015-09-30, Last modification date: 2024-11-13)

Primary citation

Mirando, A.C.,Fang, P.,Williams, T.F.,Baldor, L.C.,Howe, A.K.,Ebert, A.M.,Wilkinson, B.,Lounsbury, K.M.,Guo, M.,Francklyn, C.S.
Aminoacyl-tRNA synthetase dependent angiogenesis revealed by a bioengineered macrolide inhibitor.
Sci Rep, 5:13160-13160, 2015

PubMed Abstract: Aminoacyl-tRNA synthetases (AARSs) catalyze an early step in protein synthesis, but also regulate diverse physiological processes in animal cells. These include angiogenesis, and human threonyl-tRNA synthetase (TARS) represents a potent pro-angiogenic AARS. Angiogenesis stimulation can be blocked by the macrolide antibiotic borrelidin (BN), which exhibits a broad spectrum toxicity that has discouraged deeper investigation. Recently, a less toxic variant (BC194) was identified that potently inhibits angiogenesis. Employing biochemical, cell biological, and biophysical approaches, we demonstrate that the toxicity of BN and its derivatives is linked to its competition with the threonine substrate at the molecular level, which stimulates amino acid starvation and apoptosis. By separating toxicity from the inhibition of angiogenesis, a direct role for TARS in vascular development in the zebrafish could be demonstrated. Bioengineered natural products are thus useful tools in unmasking the cryptic functions of conventional enzymes in the regulation of complex processes in higher metazoans.

PubMed: 26271225
DOI: 10.1038/srep13160

Experimental method

X-RAY DIFFRACTION (2.8 Å)