The effects of different ratio of native profilin on maize (Zea mays L.) pollen actin polymerization in vitro were analyzed by using ultracentrifuging sedimentation and ultraviolet absorption spectrum measurement (the molar ratio of profilin to actin was 2∶1, 1.5∶1, 1∶1, 0.5∶1, 0.1∶1 respectively). Preliminary results showed that profilin bound to G-actin and inhibited its polymerization. The inhibition of actin polymerization by profilin increased with the increasing ratio of profilin to pollen actin. The dissociation constant （Kd） value of profilin for binding to actin was (1.30±0.33) μmol/L. No stimulation effect of profilin on actin polymerization was observed, suggesting that pollen profilin may affect actin organization by sequestering the G-actin.
前纤维蛋白影响花粉肌动蛋白体外聚合分析
任海云 易克喜 荆艳萍
（细胞增殖及调控生物学教育部重点实验室，北京师范大学生命科学学院，北京100875）
摘要：利用超速离心沂淀及紫外分光光度测定等技术，研究了不同比例的玉米（Ｚｅａ ｎａｙｓ Ｌ．）花粉内泊前纤维蛋白对玉米（Ｚｅａ ｍａｙｓ Ｌ．）花烩肌动蛋白（前纤维蛋白与肌动蛋白摩尔数比分别为２：１，１．５：１，１：１，０．５：１，０．１：１）聚合与解聚的影响。初步实验结果显示，前纤维蛋白在各种比例下均可与Ｍｇ＝ＡＴＰ肌动蛋白结合并抑制肌动蛋白的聚实验条件下尚水见玻有前纤维蛋白促进植物肌动蛋白聚合的作用
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