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Molecular cloning of a cDNA coding for a region of an apoprotein from the 'insoluble' mucin complex of rat small intestine.

Journal article
Authors Gunnar C. Hansson
Dan Baeckström
I Carlstedt
Karin Klinga-Levan
Published in Biochemical and biophysical research communications
Volume 198
Issue 1
Pages 181-90
ISSN 0006-291X
Publication year 1994
Published at Institute of Medical Biochemistry
Pages 181-90
Language en
Keywords Amino Acid Sequence, Animals, Apoproteins, biosynthesis, genetics, Base Sequence, Cells, Cultured, Chromosome Mapping, Cloning, Molecular, methods, DNA, isolation & purification, DNA, Complementary, metabolism, Gene Expression, Glycopeptides, isolation & purification, Humans, Hybrid Cells, Intestinal Mucosa, metabolism, Intestine, Small, metabolism, Mice, Molecular Sequence Data, Mucin-2, Mucins, biosynthesis, genetics, Neoplasm Proteins, genetics, Open Reading Frames, RNA, Messenger, analysis, metabolism, Rats, Rats, Sprague-Dawley, Restriction Mapping, Sequence Homology, Amino Acid, Transcription, Genetic
Subject categories Medical Biotechnology (with a focus on Cell Biology (including Stem Cell Biology), Molecular Biology, Microbiology, Biochemistry or Biopharmacy)


The major part of rat small intestinal mucins occurs as an 'insoluble' glycoprotein complex unextractable in 6 M guanidinium chloride unless disulfide bonds are cleaved. One of the trypsin-resistant high-glycosylated domains of this complex (glycopeptide A) was recently isolated. We have now deglycosylated it with HF, injected it into rabbits and the obtained antiserum was used for expression cloning providing a cDNA clone (VR-1A). This clone contained an open reading frame of 235 amino acids composed of two regions. The deduced N-terminal 53 amino acids included seven Cys residues and only one Ser, followed by a region of 182 residues with 64% Ser and Thr but devoid of Cys residues. Analysis of mRNA revealed a transcript of about 12 kb, identical in size to a band labelled with a probe based on the rat mucin-like protein (MLP/Muc2) cDNA. Pulsed-field gel electrophoresis of genomic rat DNA showed identical bands (380 and 500 kb) when blots were sequentially probed with the MLP/Muc2 probe and VR-1A. A panel of mouse x rat hybrids was used to localize the gene corresponding to both VR-1A and Muc2 to rat chromosome 1. The results strongly suggest that the 'insoluble' mucin complex of the rat small intestine is encoded by the Muc2 gene.

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