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豇豆根瘤线粒体的制备和性质。

Preparation and properties of mitochondria from cowpea nodules.

机构信息

Boyce Thompson Institute for Plant Research, Ithaca, New York 14853.

出版信息

Plant Physiol. 1986 Aug;81(4):1092-6. doi: 10.1104/pp.81.4.1092.

Abstract

Mitochondria were isolated from nodules of cowpea (Vigna unguiculata (L). Walp.) and purified on a Percoll gradient. They were only slightly contaminated by bacteroids (an average of 3.5%), and had low lipoxygenase activity. Compared to mitochondria from hypocotyls the nodule mitochondria had similar O(2) uptake rates and respiratory control ratios. The ADP/O ratios for both preparations were 1.4 to 1.7 and 2.3 to 2.6 with succinate and malate, respectively. Whereas mitochondria isolated from etiolated cowpea hypocotyls had 14 to 18% of their respiration insensitive to KCN, the respiration of nodule mitochondria was completely inhibited by KCN. Enzyme activities of nodule mitochondria were similar to those found in hypocotyl mitochondria, except for NAD(+)-malic enzyme which was 12-fold lower in the mitochondria from nodules.

摘要

从豇豆(Vigna unguiculata (L). Walp.)根瘤中分离线粒体,并在聚蔗糖梯度上进行纯化。它们仅被类菌体轻微污染(平均为 3.5%),且脂氧合酶活性较低。与下胚轴线粒体相比,根瘤线粒体具有相似的 O(2)摄取率和呼吸控制比。用琥珀酸和苹果酸作为底物时,两种制剂的 ADP/O 比值分别为 1.4 至 1.7 和 2.3 至 2.6。而从黄化豇豆下胚轴中分离的线粒体,有 14%至 18%的呼吸对 KCN 不敏感,而根瘤线粒体的呼吸则完全被 KCN 抑制。根瘤线粒体的酶活性与下胚轴线粒体相似,除了 NAD(+)-苹果酸酶,它在根瘤线粒体中的活性低 12 倍。

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