Porteous J W, Furneaux H M, Pearson C K, Lake C M, Morrison A
Biochem J. 1979 Jun 15;180(3):455-61. doi: 10.1042/bj1800455.
Poly(ADP-ribose) synthetase activity is found in nuclei of regenerating epithelial cells in the lower half of the crypts of guinea-pig small intestine. Nuclei from non-dividing but differentiating and maturing cells in the upper crypts and on the villi contain no more than about 10% of the synthetase activity of lower-crypt cell nuclei. The product in the active nuclei is shown to be 80% poly(ADP-ribosylated) protein and 20% mono(ADP-ribosylated) protein; 60% of thetotal labelled product was attached to acid-soluble proteins (including histones), and 40% to acid-insoluble (non-histone) proteins. The average number of ADP-ribosyl units in the oligomeric chains of the poly(ADP-ribosylated) proteins was 15 but the range of sizes of (ADP-ribose) oligomers attached to nuclear proteins was smaller in villus than in crypt cell nuclei.
在豚鼠小肠隐窝下半部再生上皮细胞的细胞核中发现了聚(ADP - 核糖)合成酶活性。上隐窝和绒毛处不分裂但正在分化和成熟的细胞的细胞核,其合成酶活性不超过下隐窝细胞核的10%。活性细胞核中的产物显示为80%的聚(ADP - 核糖基化)蛋白和20%的单(ADP - 核糖基化)蛋白;总标记产物的60%附着于酸溶性蛋白(包括组蛋白),40%附着于酸不溶性(非组蛋白)蛋白。聚(ADP - 核糖基化)蛋白寡聚链中ADP - 核糖基单元的平均数量为15,但附着于核蛋白的(ADP - 核糖)寡聚物的大小范围在绒毛细胞核中比在隐窝细胞核中更小。