Activation of Glycosylasparaginase

Activation of Glycosylasparaginase
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糖基天冬酰胺酶的激活

DOI:
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发表时间:
1996
影响因子:
4.8
通讯作者:
D. Comb
D. Comb
中科院分区:
生物学2区
文献类型:
--
作者:
C. Guan;T. Cui;V. Rao;W. Liao;Jack Benner;C. Lin;D. Comb

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采用定点突变和纯化前体体外激活的方法,分析了脑膜败血黄杆菌糖基天冬酰胺酶的激活机制。Thr-152突变为Ser或Cys导致基因产物在体内不被激活,但在体外被激活,因为突变前体的加工被细胞中的某些氨基酸抑制。动力学研究表明,活化是一个分子内的自我蛋白水解过程。His-150和Thr/Ser/Cys-152参与激活表明,自体蛋白水解类似于丝氨酸/半胱氨酸蛋白酶的蛋白水解。涉及高度保守的活性苏氨酸残基的多种功能。
The activation mechanism of glycosylasparaginase of Flavobacterium meningosepticum has been analyzed by site-directed mutagenesis and activation of purified precursors in vitro. Mutation of Thr-152 to Ser or Cys leads to gene products that are not activated in vivo but are activated in vitro because processing of the mutant precursors is inhibited by certain amino acids in the cell. Kinetic studies reveal that activation is an intramolecular autoproteolytic process. The involvement of His-150 and Thr/Ser/Cys-152 in activation suggests that autoproteolysis resembles proteolysis by serine/cysteine proteases. Multiple functions of the highly conserved active threonine residue are implicated.
DOI: 10.1016/s0021-9258(18)61070-1
发表时间: 1987-07
期刊: The Journal of biological chemistry
影响因子: --
作者:
P. Matsudaira
通讯作者: P. Matsudaira
大鼠肝糖基天冬酰胺酶的纯化和表征。
DOI: 10.1042/bj2600101
发表时间: 1989
期刊: The Biochemical journal
影响因子: --
作者:
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通讯作者: AronsonJr,NN
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: AronsonJr,NN
六种脊椎动物肝脏糖基门冬酰胺酶的比较。
DOI: 10.1042/bj2820891
发表时间: 1992
期刊: The Biochemical journal
影响因子: --
作者:
Tollersrud,OK;AronsonJr,NN
通讯作者: AronsonJr,NN
DOI: 10.1016/0014-5793(90)81211-6
发表时间: 1990
期刊: FEBS letters
影响因子: 3.5
作者:
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通讯作者: AronsonJr,NN