Glycyl-tRNA Synthetase: An Oligomeric Protein Containing Dissimilar Subunits*

AUTOR(ES)

Ostrem, Dennis L.

RESUMO

Glycyl-tRNA synthetase from Escherichia coli is a tetramer containing two small (33,000 daltons) and two large (80,000 daltons) subunits. The subunits can be separated and then reassembled to form active enzyme. Genetically altered glycyl-tRNA synthetases are modified in either the large or the small subunit. Wild type activity can be reconstituted in vitro by mixing extracts containing enzymes with modifications in different subunits.

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