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Molecular characterization of eukaryotic polysialyltransferase-1.

机译:真核生物聚唾液酸转移酶-1的分子表征。

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Polysialic acid (PSA) is a dynamically regulated product of post-translational modification of the neural cell adhesion molecule, NCAM. Presence of the large anionic carbohydrate modulates NCAM binding properties and, by increasing the intercellular space, influences interactions between other cell surface molecules. PSA expression underlies cell type- and developmental-specific alterations and correlates with stages of cellular motility. In the adult, PSA becomes restricted to regions of permanent neural plasticity and regenerating neural and muscle tissues. Recent data implicate its important function in spatial learning and memory, and in tumour biology. Here we describe the molecular characterization of polysialyltransferase-1, the key enzyme of eukaryotic PSA synthesis. In reconstitution experiments, the newly cloned enzyme induces PSA synthesis in all NCAM-expressing cell lines. Our data therefore represent convincing evidence that the polycondensation of alpha-2,8-linked sialic acids in mammals is the result of a single enzymatic activity and provide a new basis for studying the functional role of PSA in neuro- and tumour biology.
机译:聚唾液酸(PSA)是神经细胞粘附分子NCAM的翻译后修饰的动态调控产物。大的阴离子碳水化合物的存在调节NCAM的结合特性,并通过增加细胞间空间,影响其他细胞表面分子之间的相互作用。 PSA表达是细胞类型和发育特异性改变的基础,并且与细胞运动的阶段相关。在成人中,PSA仅限于永久性神经可塑性以及神经和肌肉组织再生的区域。最近的数据暗示了它在空间学习和记忆以及肿瘤生物学中的重要功能。在这里,我们描述了真核PSA合成的关键酶polysialyltransferase-1的分子特征。在重建实验中,新克隆的酶在所有表达NCAM的细胞系中诱导PSA合成。因此,我们的数据代表了令人信服的证据,即哺乳动物中与α-2,8连接的唾液酸的缩聚是单一酶活性的结果,并为研究PSA在神经和肿瘤生物学中的功能作用提供了新的基础。

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