Full text loading...
Abstract
A component that binds to human lymphoid cells was isolated from the membranes of Acholeplasma laidlawii PG8. The component was extracted using the Bligh–Dyer method and purified using a silica-gel column and TLC. The active component was identified as 3-O-[2′-O-(α-D-glucopyranosyl)- 6′-O-acyl-α-D-glucopyranosyl]-1,2-di-O- acyl-sn-glycerol (GAGDG) using 1H- and 13C-NMR and GC-MS. The compositions of the major saturated fatty acids were nC 14 (17·8%), isoC14 (10·7%) and nC 16 (34·9%) as determined by GC-MS. The amounts of unsaturated species were less than 10% of those of the corresponding saturated acids. GAGDGs which have three tetradecanoyl groups were synthesized. These synthetic GAGDGs, as well as GAGDGs derived from A. laidlawii membranes, had a high binding affinity for MOLT-4 and HUT-78 (human T cell lines), Raji (a B cell line), HL-60 (a monoblastoid cell line) and primary cultured human T cells. The binding affinities of GAGDGs with an isoC14 acyl group was higher than those with nC14 and nC16 acyl groups. The binding to lymphoid cells reveals a novel biological activity of GAGDGs.
- Received:
- Accepted:
- Revised:
- Published Online: