GAC repeat expansion from five to seven in the exonic region of the gene for cartilage oligomeric matrix protein (COMP) leads to pseudoachondroplasia, a skeletal abnormality. However, the molecular mechanism by which GAC expansions in the COMP gene lead to skeletal dysplasias is poorly understood. Here, we used MD simulations which indicate that an A...A mismatch in a d(GAC)6.d(GAC)6 duplex induces negative supercoiling, leading to a local B−to−Z DNA transition. This transition facilitates the binding of d(GAC)7.d(GAC)7 with the Zα-binding domain of human adenosine deaminase acting on RNA 1 (ADAR1, hZαADAR1), as confirmed by CD, NMR and microscale thermophoresis studies. The CD results indicated that hZαADAR1 recognizes the zigzag backbone of d(GAC)7.d(GAC)7 at the B−Z junction and subsequently converts it into Z−DNA via the so-called passive mechanism. MD simulations carried out for the modeled hZαADAR1−d(GAC)6.d(GAC)6 complex confirmed the retention of previously reported important interactions between the two molecules. These findings suggest that hZαADAR1 binding with the GAC hairpin stem in COMP can lead to a non−genetic, RNA editing−mediated substitution in the COMP that may then play a crucial role in the development of pseudoachondroplasia.
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Δευτέρα 18 Σεπτεμβρίου 2017
A B--Z ȷunction induced by an A...A mismatch in GAC repeats in the gene for cartilage oligomeric matrix protein promotes binding with the hZ{alpha}ADAR1 protein [Computational Biology]
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Medicine by Alexandros G. Sfakianakis,Anapafseos 5 Agios Nikolaos 72100 Crete Greece,00302841026182,00306932607174,alsfakia@gmail.com,