Transformed human cells produce a new fibronectin isoform by preferential alternative splicing of a previously unobserved exon. 1987

L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
Cell Biology Laboratory, Istituto Nazionale per la Ricerca sul Cancro, Genova, Italy.

Purification and amino acid sequence analysis of a proteolytic fragment of fibronectin (FN) from transformed human cells demonstrated that a high percentage of these FN molecules contains an extra amino acid sequence which is present only in a very low percentage of FN molecules from normal fibroblasts and is undetectable in plasma FN. This new amino acid sequence introduces into the FN molecule a site very sensitive to a number of proteolytic enzymes. By analyzing the cellular mRNA and genomic clones, we have demonstrated that this sequence derives from a differential splicing pattern of the FN mRNA precursors, which leads in transformed cells to a high-level expression of an extra type III homology repeat (ED-B) coded for by a previously unobserved exon. Here we also report the complete sequence of this new exon. These results demonstrate that in malignant cells the mechanisms regulating the splicing of FN mRNA precursors are altered.

UI MeSH Term Description Entries
D010446 Peptide Fragments Partial proteins formed by partial hydrolysis of complete proteins or generated through PROTEIN ENGINEERING techniques. Peptide Fragment,Fragment, Peptide,Fragments, Peptide
D002460 Cell Line Established cell cultures that have the potential to propagate indefinitely. Cell Lines,Line, Cell,Lines, Cell
D002472 Cell Transformation, Viral An inheritable change in cells manifested by changes in cell division and growth and alterations in cell surface properties. It is induced by infection with a transforming virus. Transformation, Viral Cell,Viral Cell Transformation,Cell Transformations, Viral,Transformations, Viral Cell,Viral Cell Transformations
D003001 Cloning, Molecular The insertion of recombinant DNA molecules from prokaryotic and/or eukaryotic sources into a replicating vehicle, such as a plasmid or virus vector, and the introduction of the resultant hybrid molecules into recipient cells without altering the viability of those cells. Molecular Cloning
D004262 DNA Restriction Enzymes Enzymes that are part of the restriction-modification systems. They catalyze the endonucleolytic cleavage of DNA sequences which lack the species-specific methylation pattern in the host cell's DNA. Cleavage yields random or specific double-stranded fragments with terminal 5'-phosphates. The function of restriction enzymes is to destroy any foreign DNA that invades the host cell. Most have been studied in bacterial systems, but a few have been found in eukaryotic organisms. They are also used as tools for the systematic dissection and mapping of chromosomes, in the determination of base sequences of DNAs, and have made it possible to splice and recombine genes from one organism into the genome of another. EC 3.21.1. Restriction Endonucleases,DNA Restriction Enzyme,Restriction Endonuclease,Endonuclease, Restriction,Endonucleases, Restriction,Enzymes, DNA Restriction,Restriction Enzyme, DNA,Restriction Enzymes, DNA
D005091 Exons The parts of a transcript of a split GENE remaining after the INTRONS are removed. They are spliced together to become a MESSENGER RNA or other functional RNA. Mini-Exon,Exon,Mini Exon,Mini-Exons
D005353 Fibronectins Glycoproteins found on the surfaces of cells, particularly in fibrillar structures. The proteins are lost or reduced when these cells undergo viral or chemical transformation. They are highly susceptible to proteolysis and are substrates for activated blood coagulation factor VIII. The forms present in plasma are called cold-insoluble globulins. Cold-Insoluble Globulins,LETS Proteins,Fibronectin,Opsonic Glycoprotein,Opsonic alpha(2)SB Glycoprotein,alpha 2-Surface Binding Glycoprotein,Cold Insoluble Globulins,Globulins, Cold-Insoluble,Glycoprotein, Opsonic,Proteins, LETS,alpha 2 Surface Binding Glycoprotein
D005796 Genes A category of nucleic acid sequences that function as units of heredity and which code for the basic instructions for the development, reproduction, and maintenance of organisms. Cistron,Gene,Genetic Materials,Cistrons,Genetic Material,Material, Genetic,Materials, Genetic
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein

Related Publications

L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
January 2002, Journal of cellular biochemistry,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
October 1987, Nucleic acids research,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
April 1995, Biochemical and biophysical research communications,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
December 1987, Molecular and cellular biology,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
February 2015, Journal of cellular physiology,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
August 1984, Proceedings of the National Academy of Sciences of the United States of America,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
August 2016, Oncology letters,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
December 1999, Journal of cellular biochemistry,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
July 1998, Molecular and cellular biology,
L Zardi, and B Carnemolla, and A Siri, and T E Petersen, and G Paolella, and G Sebastio, and F E Baralle
July 2001, Molecular and cellular neurosciences,
Copied contents to your clipboard!