Ribosome assembly is a remarkably complex cellular process. In the yeast large subunit (60S) alone, it requires the ordered association and folding of 3 rRNAs and 46 r-proteins as the nascent ribosomes move from the nucleolus, to the nucleus, and finally to the cytoplasm.
In a recent paper in JACS, Schultz and co-workers present a strategy where replacing a key amino acid of an enzyme by a non-standard amino acid (nsAA) produces an organism that requires this nsAA for survival. ..
the most recent issue of Organic and Biomolecular Chemistry, a paper from Matthew Hartman’s lab highlights the use of an editing-deficient valine-tRNA synthetase (ValRS T222P) to incorporate 11 non-canonical amino acids (ncAAs) into peptides synthesized in vitro.