During the search for ANP receptor ligands of microbial origin, we isolated a novel polysaccharide, HS-142-1, from culture broth of Aureobasidium sp. HS-142-1 inhibited [125I]-rANP binding to ANP receptor in rabbit kidney cortex membranes with an IC50 of 0.3μ g/ml, but gave no effects on specific binding of [125I]-Endothelin nor [125I]-Angiotensin II to their respective receptors in bovine lung membranes. HS-142-1 competitively and selectively inhibited ANP binding to its guanylyl cyclase-containing receptor purified from solubilized bovine adrenocortical membranes and blocked cGMP production elicted by ANP. HS-142-1 is the first non-peptide antagonist selective for ANP functional receptor and will be a powerful tool to elucidate the physiological functions of ANP. © 1991.
Morishita, Y., Sano, T., Ando, K., Saitoh, Y., Kase, H., Yamada, K., & Matsuda, Y. (1991). Microbial polysaccharide, HS-142-1, competitively and selectively inhibits ANP binding to its guanylyl cyclase-containing receptor. Biochemical and Biophysical Research Communications, 176(3), 949–957. https://doi.org/10.1016/0006-291X(91)90374-G