An evolutionarily conserved tripartite tryptophan motif stabilizes the prodomains of cathepsin L-like cysteine proteases.

An evolutionarily conserved tripartite tryptophan motif stabilizes the prodomains of cathepsin L-like cysteine proteases.
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进化上保守的三联色氨酸基序可稳定组织蛋白酶 L 样半胱氨酸蛋白酶的前结构域。

DOI:
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发表时间:
2000
期刊:
European Journal of Biochemistry
影响因子:
--
通讯作者:
B. Wiederanders
B. Wiederanders
中科院分区:
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文献类型:
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作者:
S. Kreusch;M. Fehn;G. Maubach;K. Nissler;W. Rommerskirch;K. Schilling;E. Weber;I. Wenz;B. Wiederanders

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组织蛋白酶L样半胱氨酸蛋白酶在前区域包含一个进化上高度保守的α-螺旋基序。根据螺旋一侧保守的氨基酸,这被称为ER(F/W)N(I/V)N基序。我们通过人原蛋白S的定点突变实验研究了该基序的功能,并用丙氨酸取代了这些氨基酸,构建了缺失部分螺旋的缺失突变体。所有突变体均在HEK293细胞中表达,但只有一个突变体W52A未被加工成成熟的组织蛋白S,也未被磷酸化或分泌到培养基中。W52是组织蛋白酶S前肽区疏水核心的一部分,由另外两个色氨酸残基W28和W31组成,在组织蛋白酶L样半胱氨酸肽酶中也是保守的。用丙氨酸取代后者会导致与W52A突变类似的后果。含有三个色氨酸残基之一突变的重组前肽作为成熟组织蛋白酶S的抑制剂,其效果比野生型前肽低三个数量级。结果表明,各自的疏水堆叠在S原和相关的组织蛋白酶L样半胱氨酸蛋白酶的正确折叠、运输和成熟中起主导作用。
Cathepsin L-like cysteine proteinases contain an evolutionarily highly conserved alpha-helical motif in the proregion. This is called the ER(F/W)N(I/V)N motif according to the conserved amino acids along one side of the helix. We studied the function of this motif using site-directed mutagenesis experiments of human procathepsin S. We replaced each of these amino acids with alanine and constructed deletion mutants lacking parts of the helix. All mutants were expressed in HEK 293 cells, but only one, W52A, was not processed to mature cathepsin S, nor was it phosphorylated or secreted into the culture medium. W52 is part of the hydrophobic core in the propeptide region of cathepsin S comprising two additional tryptophan residues, W28 and W31, also conserved among cathepsin L-like cysteine peptidases. Replacement of the latter with alanine led to consequences similar to those with the W52A mutation. Recombinant propeptides containing mutations of one of the three tryptophan residues were three orders of magnitude less effective as inhibitors of mature cathepsin S than the wild-type propeptide. The results point to a dominant role of the respective hydrophobic stack in the proper folding, transport and maturation of procathepsin S and related cathepsin L-like cysteine proteinases.
DOI: 10.1006/abbi.1994.1203
发表时间: 1994-05
影响因子: 3.9
作者:
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DOI: 10.1073/pnas.90.7.3063
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溶酶体膜糖蛋白:LAMP-1 和 LAMP-2 的特性。
DOI: --
发表时间: 1986
期刊: Biochemical Society symposium
影响因子: --
作者:
Chen,JW;Chen,GL;D'Souza,MP;Murphy,TL;August,JT
通讯作者: August,JT
DOI: 10.1042/bj3110299
发表时间: 1995-10-01
影响因子: 4.1
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MUNGER, JS;HAASS, C;CHAPMAN, HA
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