Expression Cloning of lsc, a Novel Oncogene with Structural Similarities to the Dbl Family of Guanine Nucleotide Exchange Factors*

Expression Cloning of lsc, a Novel Oncogene with Structural Similarities to the Dbl Family of Guanine Nucleotide Exchange Factors*
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lsc 的表达克隆,一种与鸟嘌呤核苷酸交换因子 Dbl 家族结构相似的新型癌基因*

DOI:
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发表时间:
1996
影响因子:
4.8
通讯作者:
Robert Kay
Robert Kay
中科院分区:
生物学2区
文献类型:
--
作者:
I. Whitehead;R. Khosravi‐Far;H. Kirk;G. Trigo;C. Der;Robert Kay

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在筛选小鼠B6SUtA1髓系祖细胞系表达的具有致癌潜力的基因时,我们分离了一个2.5千碱基对的cDNA,其表达可引起NIH 3T3细胞强烈的形态转化和不受调节的增殖。转化的cDNA编码一个截断的蛋白(称为Lsc),其序列区域与lbc癌基因的产物相似。该区域包括串联Dbl同源结构域和pleckstrin同源结构域,它们是Dbl样蛋白的标志,这是一个推测或证明的鸟嘌呤核苷酸交换因子家族,作用于Rho家族gtpase。Lsc的致癌活性需要完整的Dbl同源性和pleckstrin同源性结构域。通过共转染p190 (Rho家族GTPase的GTPase激活蛋白)和Rho家族显性阴性突变体RhoA(19N)、CDC42(17N)和Rac1(17N),降低了Lsc在NIH 3T3细胞中的转化活性。这些结果表明Rho家族的gtpase在介导Lsc转化活性中的作用,并且与Dbl家族成员的交换特异性一致。lsc基因在多种组织中表达,在造血组织(胸腺、脾脏和骨髓)中表达尤其丰富。Lsc是一个不断增长的蛋白家族的成员,可能在发育或组织特异性的方式中作为Rho家族gtpase的激活剂。
In a screen for genes with oncogenic potential expressed by the murine B6SUtA1 myeloid progenitor cell line, we isolated a 2.5-kilobase pair cDNA whose expression causes strong morphological transformation and deregulated proliferation of NIH 3T3 cells. The transforming cDNA encodes a truncated protein (designated Lsc) with a region of sequence similarity to the product of the lbc oncogene. This region includes the tandem Dbl homology and pleckstrin homology domains that are hallmarks of the Dbl-like proteins, a family of presumptive or demonstrated guanine nucleotide exchange factors that act on Rho family GTPases. Lsc requires intact Dbl homology and pleckstrin homology domains for its oncogenic activity. The transforming activity of Lsc in NIH 3T3 cells is reduced by cotransfection with p190 (a GTPase activating protein for Rho family GTPases) and the Rho family dominant-negative mutants RhoA(19N), CDC42(17N), and Rac1(17N). These results indicate a role for the Rho family of GTPases in mediating the transforming activity of Lsc and are consistent with the exchange specificities that have been attributed to Dbl family members. The lsc gene is expressed in a variety of tissues and is particularly abundant in hemopoietic tissues (thymus, spleen, and bone marrow). Lsc is a member of a growing family of proteins that may function as activators of Rho family GTPases in a developmental or tissue-specific manner.
Ras 转化的生物学测定。
DOI: 10.1016/s0076-6879(95)55042-9
发表时间: 1995
影响因子: --
作者:
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人 ABR 编码具有 GAPrac 活性且与 DBL 核苷酸交换因子结构域同源的蛋白质。
DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
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发表时间: 1993-05-07
期刊: SCIENCE
影响因子: 56.9
作者:
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发表时间: 1993-07
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: R. Davis
DOI: 10.1002/j.1460-2075.1989.tb08354.x
发表时间: 1989-08-01
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
KATZAV, S;MARTINZANCA, D;BARBACID, M
通讯作者: BARBACID, M