Glutathione S-transferase that catalyzes the conjugation of glutathione to exogenous and endogenous compounds (PubMed:14709161, PubMed:14742434). Significant glutathione conjugating activity is found only with the model substrate, 1-chloro-2,4-dinitrobenzene (CDNB) (PubMed:14709161). {ECO:0000269|PubMed:14709161, ECO:0000269|PubMed:14742434}. This is the function of Ensembl gene identifier ENSG00000197448 (GSTK1, glutathione S-transferase kappa 1).