Association of the cytoplasmic domain of intercellular-adhesion molecule-1 with glyceraldehyde-3-phosphate dehydrogenase and beta-tubulin
Association of the cytoplasmic domain of intercellular-adhesion molecule-1 with glyceraldehyde-3-phosphate dehydrogenase and beta-tubulin
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DOI：
10.1111/j.1432-1033.1996.0173q.x
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发表时间：
1996-05-01
期刊：
影响因子：
--
通讯作者：
Couraud, PO
中科院分区：
文献类型：
--
作者：
Federici, C;Camoin, L;Couraud, PO
To elucidate the molecular mechanisms of the transendothelial migration of leukocytes, we attempted to identify the cellular proteins capable of interaction with the cytoplasmic domain of the intercellular adhesion molecule-1 (ICAM-1) in a rat brain microvessel endothelial cell line (RBE4 cells). A 27-amino-acid synthetic peptide, corresponding to the cytoplasmic domain of rat ICAM-1, was covalently linked to a Sepharose matrix, Upon affinity chromatography of RBE4 cell cytosol, several ICAM-1-interacting proteins were specifically eluted by the soluble peptide, Two of these proteins have been identified by microsequencing as the cytoskeletal protein beta-tubulin and the glycolytic enzyme glyceraldehyde-3-phosphate dehydrogenase (GraP-DH). Experiments carried out with purified GraP-DH or CNBr fragments of GraP-DH indicated that binding to the ICAM-1 matrix was mediated by the C-terminal domain of GraP-DH, containing the binding site of the cofactor NAD(+), and that NAD(+) could compete with this binding. Using a series of ICAM-1 C-terminal truncated peptides, we could demonstrate that (a) the nitric-oxide-induced covalent linkage of NAD(+) to GraP-DH was impaired by these peptides, (b) the glycolytic activity of GraP-DH was drastically inhibited by a truncated peptide containing the 15 C-terminal residues, (c) nitric oxide appeared to prevent this inhibition.Together, our results demonstrate that GraP-DH specifically associates with the isolated ICAM-1 cytoplasmic domain. Since GraP-DH is known as a microtubule bundling protein, these findings suggest that, in a cellular environment, GraP-DH may behave as an adaptor molecule by linking ICAM-1 to the microtubule network. The role of nitric oxide in the modulation of this interaction deserves further investigation.
