Semisynthetic Chemical Modification of the Antifungal Lipopeptide Echinocandin B (ECB): Structure-Activity Studies of the Lipophilic and Geometric Parameters of Polyarylated Acyl Analogs of ECB
作者:Manuel Debono、William W. Turner、Lisa LaGrandeur、Fred J. Burkhardt、Jeffrey S. Nissen、Kimberly K. Nichols、Michael J. Rodriguez、Mark J. Zweifel、Douglas J. Zeckner
DOI:10.1021/jm00017a012
日期:1995.8
as a guide, a variety of novel ECB analogs were synthesized which included arylacyl groups that incorporated biphenyl, terphenyl, tetraphenyl, and arylethynyl groups. Generally the glucan synthase inhibition by these analogs correlated well with in vitro and in vivo activities and was likewise influenced by the structure of the side chain. These structural variations resulted in enhancement of antifungal
Echinocandin B(ECB)是由亚油酸在N端酰化的复杂环状肽组成的脂肽。ECB的酶促脱酰作用提供了肽“核”作为无生物活性的底物,通过N端的化学酰化作用可从中产生新的ECB类似物。酰基的变化揭示了侧链的结构和物理性质,特别是其几何形状和亲脂性,在确定类似物的抗真菌效力方面起着关键作用。使用CLOGP值描述和比较侧链片段的亲脂性,表明抗真菌活性的表达要求> 3.5。其次,侧链的线性刚性几何形状是增强抗真菌效力的最有效形状。使用这些参数作为指导,合成了多种新型ECB类似物,其中包括结合了联苯,三联苯,四联和芳乙炔基的芳基。通常,这些类似物对葡聚糖合酶的抑制与体外和体内活性密切相关,并且同样受侧链结构的影响。这些结构变化导致在体外和体内测定中抗真菌活性的增强。这些类似物中的一些,包括LY303366(14a),通过口服途径有效。通常,这些类似物对葡聚糖合酶的抑制与体外和体内活性密切相关,