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A purification method for a molecular complex in which a scaffold molecule is fully loaded with heterogeneous molecules

An affinity resin-based pull-down method is convenient for the purification of biochemical materials. However, its use is difficult for the isolation of a molecular complex fully loaded with multiple components from a reaction mixture containing the starting materials and intermediate products. To o...

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Published in:PloS one 2015-03, Vol.10 (3), p.e0120576-e0120576
Main Authors: Ohuchi, Shoji J, Sagawa, Fumihiko, Ohno, Hirohisa, Inoue, Tan
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description An affinity resin-based pull-down method is convenient for the purification of biochemical materials. However, its use is difficult for the isolation of a molecular complex fully loaded with multiple components from a reaction mixture containing the starting materials and intermediate products. To overcome this problem, we have developed a new purification procedure that depends on sequential elimination of the residues. In practice, two affinity resins were used for purifying a triangular-shaped RNP (RNA-protein complex) consisting of three ribosomal proteins (L7Ae) bound to an RNA scaffold. First, a resin with immobilized L7Ae protein captured the incomplete RNP complexes and the free RNA scaffold. Next, another resin with an immobilized chemically modified RNA of a derivative of Box C/D motif, the binding partner of L7Ae, was used to capture free protein. The complete triangular RNP was successfully purified from the mixture by these two steps. Obviously, the purified triangular RNP displaying three protein-binding peptides exhibited an improved performance when compared with the unrefined product. Conceptually, this purification procedure should be applicable for the purification of a variety of complexes consisting of multiple components other than RNP.
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However, its use is difficult for the isolation of a molecular complex fully loaded with multiple components from a reaction mixture containing the starting materials and intermediate products. To overcome this problem, we have developed a new purification procedure that depends on sequential elimination of the residues. In practice, two affinity resins were used for purifying a triangular-shaped RNP (RNA-protein complex) consisting of three ribosomal proteins (L7Ae) bound to an RNA scaffold. First, a resin with immobilized L7Ae protein captured the incomplete RNP complexes and the free RNA scaffold. Next, another resin with an immobilized chemically modified RNA of a derivative of Box C/D motif, the binding partner of L7Ae, was used to capture free protein. The complete triangular RNP was successfully purified from the mixture by these two steps. 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This is an open access article distributed under the terms of the Creative Commons Attribution License: http://creativecommons.org/licenses/by/4.0/ (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>2015 Ohuchi et al 2015 Ohuchi et al</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c802t-efd1fe8c7f82c373d432125bf7eeee4701c66353ce0d730228da92272e3ac4ed3</citedby><cites>FETCH-LOGICAL-c802t-efd1fe8c7f82c373d432125bf7eeee4701c66353ce0d730228da92272e3ac4ed3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.proquest.com/docview/1664222574/fulltextPDF?pq-origsite=primo$$EPDF$$P50$$Gproquest$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.proquest.com/docview/1664222574?pq-origsite=primo$$EHTML$$P50$$Gproquest$$Hfree_for_read</linktohtml><link.rule.ids>230,314,727,780,784,885,25753,27924,27925,37012,37013,44590,53791,53793,75126</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/25781936$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><contributor>Chang, Ing-Feng</contributor><creatorcontrib>Ohuchi, Shoji J</creatorcontrib><creatorcontrib>Sagawa, Fumihiko</creatorcontrib><creatorcontrib>Ohno, Hirohisa</creatorcontrib><creatorcontrib>Inoue, Tan</creatorcontrib><title>A purification method for a molecular complex in which a scaffold molecule is fully loaded with heterogeneous molecules</title><title>PloS one</title><addtitle>PLoS One</addtitle><description>An affinity resin-based pull-down method is convenient for the purification of biochemical materials. 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subjects Affinity
Binding
Deoxyribonucleic acid
DNA
Laboratories
Ligands
Methods
Peptides
Protein binding
Proteins
Purification
Recombinant Proteins - chemistry
Recombinant Proteins - isolation & purification
Resins
Ribonucleic acid
Ribosomal proteins
Ribosomal Proteins - chemistry
Ribosomal Proteins - isolation & purification
RNA
RNA polymerase
RNA, Ribosomal - chemistry
RNA, Ribosomal - isolation & purification
RNA-Binding Proteins - chemistry
RNA-Binding Proteins - isolation & purification
title A purification method for a molecular complex in which a scaffold molecule is fully loaded with heterogeneous molecules
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