The human intraepithelial lymphocyte marker HML‐1 is an integrin consisting of a β7 subunit associated with a distinctive α chain

The human intraepithelial lymphocyte marker HML‐1 is an integrin consisting of a β7 subunit associated with a distinctive α chain
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人上皮内淋巴细胞标记物 HML-1 是一种整合素,由与独特 α 链相关的 β7 亚基组成

DOI:
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发表时间:
1992
期刊:
影响因子:
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通讯作者:
T. Meo
T. Meo
中科院分区:
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文献类型:
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作者:
N. Cerf‐Bensussan;B. Bègue;J. Gagnon;T. Meo

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由单克隆抗体(mAb) HML‐1定义的膜抗原在填充肠上皮的T细胞上大量表达,并且很大程度上局限于T细胞。我们发现抗原的成熟形式是由一条150‐kDa α链和一条120‐kDa β链组成的异源二聚体。从纯化的β链切割的胰蛋白酶肽直接测序鉴定出该多肽具有整合素β7同型。最近从T细胞cDNA文库中分离到编码β7链的cDNA克隆,但尚未在蛋白水平上鉴定到β7链。没有关于HML‐1 α链一级结构的信息。我们发现这个亚基是作为前体形式合成的,像其他几个整合素α亚基一样,经历了肽键的翻译后裂解。在先前鉴定的11个人类整合素α链中,有10个具有与HML‐1 α不同的生化特征和/或分布。一种是VLAα4 (CD49d),分子量为150 kDa,在HML‐1+细胞上表达,但不被HML‐1 mAb识别。我们得出结论,HML - 1是整合素家族的一个新成员,由β7链和一个尚未描述的人α链组成,其特征是翻译后切割10 - kDa肽。因此,HML‐1可能是小鼠抗原M290的人对应物。
The membrane antigen defined by the monoclonal antibody (mAb) HML‐1 is abundantly expressed on, and largely restricted to, the T cells which populate the intestinal epithelium. We show that the mature form of the antigen is a heterodimer comprising a 150‐kDa α chain and a 120‐kDa β chain. Direct sequencing of tryptic peptides cleaved from the purified β chain identified this polypeptide with the integrin β7 isotype. cDNA clones coding for the β7 chain have recently been isolated from T cell cDNA libraries, but the β7 chain had not been identified at the protein level. No information is available concerning the primary structure of the HML‐1 α chain. We show that this subunit is synthesized as a precursor form that undergoes, like several other integrin α subunits, a post‐translational cleavage of a peptide bond. Among the 11 human integrin α chains previously identified, 10 have biochemical features and/or a distribution different from those of HML‐1 α. One, VLAα4 (CD49d), has a molecular mass of 150 kDa and is expressed on HML‐1+ cells but is not recognized by HML‐1 mAb. We conclude that HML‐1 is a novel member of the integrin family made of the β7 chain and of an as‐yet‐undescribed human α chain characterized by the post‐translational cleavage of a 10‐kDa peptide. HML‐1 is, thus, probably the human counterpart of the mouse antigen M290.
DOI: 10.1002/j.1460-2075.1987.tb02746.x
发表时间: 1987-12-01
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
CORBI, AL;MILLER, LJ;SPRINGER, TA
通讯作者: SPRINGER, TA
DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
作者:
Heino,J;Ignotz,RA;Hemler,ME;Crouse,C;Massagué,J
通讯作者: Massagué,J
DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
作者:
Ignotz,RA;Heino,J;Massagué,J
通讯作者: Massagué,J
在白细胞中鉴定出的整合素 β 亚基 (β 7) 的完整氨基酸序列。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Erle,DJ;Rüegg,C;Sheppard,D;Pytela,R
通讯作者: Pytela,R
一种针对大鼠肠道淋巴细胞的单克隆抗体。
DOI: --
发表时间: 1986
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
作者:
Cerf-Bensussan,N;Guy-Grand,D;Lisowska-Grospierre,B;Griscelli,C;Bhan,AK
通讯作者: Bhan,AK