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Article |
Structures of fungal and plant acetohydroxyacid synthases
Structures of the acetohydroxyacid synthase complexes of Saccharomyces cerevisiae and Arabidopsis thaliana provide insights into the biosynthesis of and feedback inhibition by branched-chain amino acids.
- Thierry Lonhienne
- , Yu Shang Low
- & Luke W. Guddat
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Article |
Crystal structure of the human COP9 signalosome
The COP9 signalosome (CSN) complex regulates cullin–RING E3 ubiquitin ligases—the largest class of ubiquitin ligase enzymes, which are involved in a multitude of regulatory processes; here, the crystal structure of the entire human CSN holoenzyme is presented.
- Gondichatnahalli M. Lingaraju
- , Richard D. Bunker
- & Nicolas H. Thomä
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Letter |
An unanticipated architecture of the 750-kDa α6β6 holoenzyme of 3-methylcrotonyl-CoA carboxylase
The crystal structure of Pseudomonas aeruginosa 3-methylcrotonyl-CoA carboxylase is determined and found to be markedly different from that of propionyl-CoA carboxylase.
- Christine S. Huang
- , Peng Ge
- & Liang Tong
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Article |
Structure of a bacterial ribonuclease P holoenzyme in complex with tRNA
tRNAs are synthesized in a premature form that requires trimming of the 5′ and 3′ ends and modification of specific nucleotides. RNase P, a complex containing a long catalytic RNA and a protein cofactor, catalyses the cleavage that generates the mature 5′ end. Here, the structure of RNase P bound to mature tRNAPhe is solved. Recognition of the leader sequence and its mechanism of cleavage is determined by soaking an oligonucleotide corresponding to the premature 5′ end into the crystal.
- Nicholas J. Reiter
- , Amy Osterman
- & Alfonso Mondragón
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Letter |
Crystal structure of the α6β6 holoenzyme of propionyl-coenzyme A carboxylase
Propionyl-coenzyme A carboxylase (PCC) is a biotin-dependent enzyme that is essential for the catabolism of several amino acids, cholesterol and some fatty acids. Here, the crystal structure of a bacterial PCC is presented, along with a cryo-electron microscopy reconstruction showing a similar structure for human PCC. The structural information establishes a molecular basis for understanding the known disease-causing mutations in PCC, and is relevant to the holoenzymes of other biotin-dependent carboxylases.
- Christine S. Huang
- , Kianoush Sadre-Bazzaz
- & Liang Tong