Aspartyl-tRNA synthetase with relaxed tRNA specificity since it is able to aspartylate not only its cognate tRNA(Asp) but also tRNA(Asn) with similar efficiencies. Reaction proceeds in two steps: L-aspartate is first activated by ATP to form Asp-AMP and then transferred to the acceptor end of tRNA(Asp/Asn). ATP + L-aspartate + tRNA(Asx) = AMP + diphosphate + L-aspartyl-tRNA(Asx) kcat is 0.09 sec(-1) for tRNA aspartylation at 37 degrees Celsius and 0.24 sec(-1) at 70 degrees Celsius. kcat is 0.092 sec(-1) for tRNA(Asn) aspartylation at 70 degrees Celsius. Homodimer. Makes part of a ribonucleoprotein particle (RNP) called transamidosome that allows channelling of the aa-tRNA from non-discriminating aspartyl-tRNA synthetase active site to the GatCAB amidotransferase site. The transamidosome complex is formed by two GatCABs, one dimeric ND-AspRSs and two tRNAs(Asn) molecules. Constitutively expressed in a constant ratio along the growth of the bacterium. Aspartate mischarged on tRNA(Asn) is then converted into asparagine by the tRNA-dependent amidotransferase GatCAB. Belongs to the class-II aminoacyl-tRNA synthetase family. Type 2 subfamily.