Abstract
We have used the yeast two-hybrid system to search for cytoplasmic proteins that might assist in the intracellular trafficking of the soluble beta-galactoside-binding protein, galectin-3. We utilised as bait murine full-length galectin-3 to screen a murine 3T3 cDNA library. Several interacting clones were found to encode a partial open reading frame and a full-length clone was obtained by rapid amplification of cDNA ends methodology. In various assays in vitro the novel protein was shown to bind galectin-3 in a carbohydrate-independent manner. The novel protein contains an unusually high content of cysteine and histidine residues and shows significant sequence homologies with several metal ion-binding motifs present in known proteins. Confocal immunofluorescence microscopy of permeabilised 3T3 cells shows a prominent perinuclear, as well as cytoplasmic, localisation of the novel protein.
MeSH terms
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3T3 Cells
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Amino Acid Motifs
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Amino Acid Sequence
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Animals
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Antigens, Differentiation / chemistry
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Antigens, Differentiation / genetics
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Antigens, Differentiation / metabolism*
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Binding Sites
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Carbohydrate Metabolism*
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Cell Nucleus / chemistry
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Cloning, Molecular
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Conserved Sequence / genetics
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Cysteine / genetics
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Cysteine / metabolism*
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Cytoplasm / chemistry*
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Galectin 3
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Histidine / genetics
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Histidine / metabolism*
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Humans
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Mice
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Microscopy, Fluorescence
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Molecular Sequence Data
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Peptide Fragments / chemistry
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Peptide Fragments / genetics
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Peptide Fragments / metabolism
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Precipitin Tests
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Protein Binding
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Proteins / chemistry
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Proteins / genetics
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Proteins / metabolism*
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RNA, Messenger / analysis
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RNA, Messenger / genetics
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Sequence Alignment
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Two-Hybrid System Techniques
Substances
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Antigens, Differentiation
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Cyhr1 protein, mouse
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Galectin 3
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Peptide Fragments
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Proteins
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RNA, Messenger
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Histidine
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Cysteine