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Braun, A, Bordoy, R, Stanchi, F, Moser, M, Kostka G, G, Ehler, E, Brandau, O and Fässler, R (2003) PINCH2 is a new five LIM domain protein, homologous to PINCHand localized to focal adhesions. Exp. Cell Res. 284:239-50


PINCH is a five LIM domain protein involved in the regulation of integrin-mediated cell adhesion. It has been shown that PINCH interacts with integrin-linked kinase and Nck2. Here we describe a new isoform of PINCH, which we call PINCH2. Therefore, we rename PINCH to PINCH1. PINCH2 has an overall similarity of 92% to PINCH1 and contains five LIM domains like PINCH1. While protein and gene structure of the PINCH homologues are very similar and well conserved during evolution, we observed differential expression pattern of the mRNAs. Based on northern hybridization of mouse embryo RNA, PINCH1 is already detectable at E8.5. It is highly expressed during later stages of development and in all adult mouse tissues analyzed, with the highest levels in heart, lung, bladder, skin, and uterus. In contrast, significant PINCH2 expression starts at E14.5. In adult mice it is widely expressed, similar to PINCH1, but absent from spleen and thymus. In situ hybridization confirmed the Northern data and showed differential expression of PINCH1 and PINCH2 in embryonic intestine. Finally, we demonstrate that PINCH2 localizes to focal adhesions in NIH 3T3 cells and to Z-disks in primary rat cardiomyocytes.




3T3 Cells; Adaptor Proteins, Signal Transducing; Animals; Carrier Proteins/metabolism; Cell Membrane/metabolism; DNA, Complementary/analysis; DNA, Complementary/genetics; DNA-Binding Proteins/genetics; DNA-Binding Proteins/isolation & purification; Embryo, Mammalian/embryology; Embryo, Mammalian/metabolism; Eukaryotic Cells/metabolism; Eukaryotic Cells/ultrastructure; Extracellular Matrix/metabolism; Extracellular Matrix/ultrastructure; Fetus; Fibroblasts/metabolism; Focal Adhesions/metabolism; Focal Adhesions/ultrastructure; LIM Domain Proteins; Membrane Proteins; Mice; Molecular Sequence Data; Myocytes, Cardiac/metabolism; Protein Isoforms/genetics; Protein Isoforms/isolation & purification; Protein Structure, Tertiary/genetics; Protein-Serine-Threonine Kinases/metabolism; RNA, Messenger/metabolism; Sequence Homology, Amino Acid; Sequence Homology, Nucleic Acid; Viscera/embryology; Viscera/metabolism



Gene product Qualifier GO ID GO term name Evidence Code with/from Aspect Notes Status

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