The secreted Dictyostelium protein CfaD is a chalone.

The secreted Dictyostelium protein CfaD is a chalone.
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DOI:
10.1242/jcs.026682
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发表时间:
2008-08-01
影响因子:
4
通讯作者:
Gomer RH
Gomer RH
中科院分区:
生物学2区
文献类型:
--
作者:
Bakthavatsalam D;Brock DA;Nikravan NN;Houston KD;Hatton RD;Gomer RH

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盘状网柄藻细胞分泌CfaD,一种类似于组织蛋白酶的蛋白质。缺乏cfaD的细胞比野生型细胞增殖更快并达到更高的稳定期密度,而过表达CfaD的细胞增殖缓慢并在低密度时达到稳定期。在每个细胞核的基础上,CfaD影响增殖,但不影响生长。没有CfaD的缺点是孢子活力降低。重组CfaD没有可检测的蛋白酶活性,但当添加到细胞中时,会抑制野生型和cfaD−细胞的增殖。分泌的蛋白AprA也抑制增殖。AprA对CfaD的增殖作用是必需的。分子筛层析表明,在条件生长培养基中,60 kDa的CfaD是一个~150 kDa的复合物的一部分,层析和下拉试验表明,CfaD与AprA相互作用。这些结果表明,两个相互作用的蛋白质可能一起作为一个负反馈回路,减缓网骨藻细胞增殖的抑素信号。
Dictyostelium discoideum cells secrete CfaD, a protein that is similar to cathepsin proteases. Cells that lack cfaD proliferate faster and reach a higher stationary-phase density than wild-type cells, whereas cells that overexpress CfaD proliferate slowly and reach the stationary phase when at a low density. On a per-nucleus basis, CfaD affects proliferation but not growth. The drawback of not having CfaD is a reduced spore viability. Recombinant CfaD has no detectable protease activity but, when added to cells, inhibits the proliferation of wild-type and cfaD− cells. The secreted protein AprA also inhibits proliferation. AprA is necessary for the effect of CfaD on proliferation. Molecular-sieve chromatography indicates that in conditioned growth medium, the 60 kDa CfaD is part of a ~150 kDa complex, and both chromatography and pull-down assays suggest that CfaD interacts with AprA. These results suggest that two interacting proteins may function together as a chalone signal in a negative feedback loop that slows Dictyostelium cell proliferation.
DOI: 10.1093/nar/gnh136
发表时间: 2004-01-01
影响因子: 14.9
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Faix, J;Kreppel, L;Kimmel, AR
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DOI: 10.1074/jbc.m309101200
发表时间: 2003-12-26
影响因子: 4.8
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发表时间: 2003-08-01
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发表时间: 2007-01-01
期刊: CELL CYCLE
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发表时间: 1995-02-17
影响因子: 5.6
作者:
BERTI, PJ;STORER, AC
通讯作者: STORER, AC