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This article is an orphan, as few or no other articles link to it. Please introduce links to this page from related articles; suggestions may be available. (October 2008) An example of a ribonucleoprotein-motif protein. From PDB entry 1IBM. Ribonucleoprotein particle (RNP) is a compound that combines ribonucleic acid (RNA) and protein together. It is one of the main components of nucleolus. RNP is an RNA binding motif in an RNA binding protein. Aromatic amino acid residues in this RNP motif result in stacking interactions with RNA. Lysine residues in the helical portion of RNA binding proteins help to stabilize interactions with nucleic acids. This nucleic acid binding is a result of highly positive nature of lysine side chains and the negative character of nucleic acid phosphate backbones. Anti-RNP antibodies are linked to mixed connective tissue disease although nearly 40% of Lupus erythematosus patients will be positive for anti-RNP. Also, Anti-RNP are closely related to Sjögren Syndrome and have two types : SS-A (Ro) and SS-B (La). This cell biology article is a stub. You can help Wikipedia by expanding it. v • d • e