Applied Biochemistry Division, DSIR, Palmerston North, New Zealand.
Plant Physiol. 1986 May;81(1):293-6. doi: 10.1104/pp.81.1.293.
Phosphoserine aminotransferase activity was detected in the plant and bacteroid fractions from soybean (Glycine max) root nodules. Both total and specific activities increased in the plant fraction during nodule development. Serine-pyruvate aminotransferase activity was not detectable in the plant or bacteroid fractions of these nodules. Sucrose density gradient fractionation indicated a proplastid localization for phosphoserine aminotransferase. The data presented support a role for this enzyme in carbon supply to purine biosynthesis in the pathway of ureide biogenesis in soybean nodules.
在大豆(Glycine max)根瘤的植物和菌根体部分中检测到磷酸丝氨酸转氨酶的活性。在根瘤发育过程中,植物部分的总活性和比活性均增加。在这些根瘤的植物或菌根体部分中,无法检测到丝氨酸-丙酮酸转氨酶的活性。蔗糖密度梯度分级表明,磷酸丝氨酸转氨酶位于前质体中。所提供的数据支持该酶在大豆根瘤中脲生物合成途径中嘌呤生物合成的碳供应中的作用。