Pradimicin A, a d-mannose-binding antibiotic, binds pyranosides of l-fucose and l-galactose in a calcium-sensitive manner
作者:Yu Nakagawa、Yasunori Watanabe、Yasuhiro Igarashi、Yukishige Ito、Makoto Ojika
DOI:10.1016/j.bmcl.2015.05.021
日期:2015.8
and l-Gal-OMe were found to exhibit significant binding to PRM-A. However, increased Ca2+ concentration abolished this binding, raising the possibility that poor binding of l-Fuc and l-Gal to PRM-A is attributed to their chelation with Ca2+ ion. This possibility was partly supported by 1H NMR analysis that detected interaction of l-Fuc and l-Gal with Ca2+ ion in aqueous solution. These results collectively
Pradimicin A(PRM-A)是一种独特的抗生素,在Ca 2+离子存在下,具有类似凝集素的能力,可以结合d-甘露糖(d -Man )。尽管积累的证据表明PRM-A可以识别d -Man的2-,3-和4-羟基,但是BMY-28864(一种人工PRM-A衍生物)不结合1- fucose(1- Fuc)。和1-半乳糖(1- Gal),两者均与d -Man共享三个羟基的特征阵列。为了获得对此不一致现象的合理解释,我们进行了PRM-A与l -Fuc,l的共沉淀实验。-Gal及其甲基吡喃糖苷(1 -Fuc-OMe,1 -Gal-OMe),可利用二元[PRM-A / Ca 2+ ]配合物的聚集体形成倾向。而升-fUC和升-Gal几乎不掺入骨料,升-fUC-OME和升-Gal-OME发现显示显著结合PRM-A。然而,增加的Ca 2+浓度消除了该结合,增加了1- Fuc和1 -Gal与PRM-A结合不良的可能性归因于它们与Ca