Tyrosine--tRNA ligase that catalyzes the attachment of tyrosine to tRNA(Tyr) in a two-step reaction: tyrosine is first activated by ATP to form Tyr-AMP and then transferred to the acceptor end of tRNA(Tyr) (Probable) (PubMed:25533949). Also acts as a positive regulator of poly-ADP-ribosylation in the nucleus, independently of its tyrosine--tRNA ligase activity (PubMed:25533949). Activity is switched upon resveratrol-binding: resveratrol strongly inhibits the tyrosine--tRNA ligase activity and promotes relocalization to the nucleus, where YARS1 specifically stimulates the poly-ADP- ribosyltransferase activity of PARP1 (PubMed:25533949). {ECO:0000269|PubMed:25533949, ECO:0000305|PubMed:16429158, ECO:0000305|PubMed:9162081}. This is the function of Ensembl gene identifier ENSG00000134684 (YARS1, tyrosyl-tRNA synthetase 1).