Sulfotransferase that utilizes 3'-phospho-5'-adenylyl sulfate (PAPS) as sulfonate donor to catalyze the transfer of sulfate to position 6 of the N-acetylgalactosamine (GalNAc) residue of chondroitin (PubMed:9597547, PubMed:11696535). Chondroitin sulfate constitutes the predominant proteoglycan present in cartilage and is distributed on the surfaces of many cells and extracellular matrices (PubMed:9597547). Catalyzes with a lower efficiency the sulfation of Gal residues of keratan sulfate, another glycosaminoglycan (PubMed:11696535). Can also catalyze the sulfation of the Gal residues in sialyl N-acetyllactosamine (sialyl LacNAc) oligosaccharides (By similarity). May play a role in the maintenance of naive T-lymphocytes in the spleen (PubMed:11696535). n 3'-phosphoadenylyl sulfate + chondroitin beta-D-glucuronate = n adenosine 3',5'-bisphosphate + chondroitin 6'-sulfate + 2 H(+) 3'-phosphoadenylyl sulfate + keratan = adenosine 3',5'-bisphosphate + keratan 6'-sulfate. Widely expressed. Highly expressed in spleen, lung, eye and stomach. Constitutively expressed at low level during the mid- to late-gestation period. Expressed in the brain in a temporally controlled manner: peaks at 2 weeks after birth in the cerebellum, but at 3 weeks in the cerebrum. Localizes to stromal cells in the bone marrow, and stromal cells in the marginal zone and red pulp of the spleen, but the sense probe did not. N-glycosylated. Mice are viable through adulthood. In their spleen the level of chondroitin 6'-sulfate is almost undetectable. In the spleen of 5-6 week-old mice, the number of CD62L(+)CD44(low) T-lymphocytes corresponding to naive T-lymphocytes is significantly decreased, whereas those in other secondary lymphoid organs are unchanged. Belongs to the sulfotransferase 1 family. Gal/GlcNAc/GalNAc subfamily.