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. 2022 Apr 29;12(5):648. doi: 10.3390/biom12050648

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Structural properties of G-quadruplex-binding proteins. RGG/RG motifs are from NCL, hnRNP U and CIRBP. The RRM domain structure is derived from Protein Data Bank with structure code 2KRR (NCL) [112]. RRM domain is an αβ sandwich structure composed of one four-stranded antiparallel β-sheet and two α-helices packed against the β-sheet. The OB-fold domain structure is derived from Protein Data Bank with structure code 5W2L (CTC1) [113]. OB-fold domain is a β-barrel formed by five antiparallel β-sheets.