ジャーナル: Structure / 年: 2019 タイトル: Non-syndromic Mitral Valve Dysplasia Mutation Changes the Force Resilience and Interaction of Human Filamin A. 著者: Tatu J K Haataja / Rafael C Bernardi / Simon Lecointe / Romain Capoulade / Jean Merot / Ulla Pentikäinen / 要旨: Filamin A (FLNa), expressed in endocardial endothelia during fetal valve morphogenesis, is key in cardiac development. Missense mutations in FLNa cause non-syndromic mitral valve dysplasia (FLNA-MVD). ...Filamin A (FLNa), expressed in endocardial endothelia during fetal valve morphogenesis, is key in cardiac development. Missense mutations in FLNa cause non-syndromic mitral valve dysplasia (FLNA-MVD). Here, we aimed to reveal the currently unknown underlying molecular mechanism behind FLNA-MVD caused by the FLNa P637Q mutation. The solved crystal structure of the FLNa3-5 P637Q revealed that this mutation causes only minor structural changes close to mutation site. These changes were observed to significantly affect FLNa's ability to transmit cellular force and to interact with its binding partner. The performed steered molecular dynamics simulations showed that significantly lower forces are needed to split domains 4 and 5 in FLNA-MVD than with wild-type FLNa. The P637Q mutation was also observed to interfere with FLNa's interactions with the protein tyrosine phosphatase PTPN12. Our results provide a crucial step toward understanding the molecular bases behind FLNA-MVD, which is critical for the development of drug-based therapeutics.
登録者
Tatu Haataja (University of Jyväskylä, Jyväskylän, Finland)
設備名称: ESRF BM29 / 地域: Grenoble / 国: France / 線源: X-ray synchrotron / 波長: 0.1 Å / スペクトロメータ・検出器間距離: 2.9 mm
検出器
名称: Pilatus 1M / タイプ: Dectris / Pixsize x: 172 mm
スキャン
タイトル: Filamin A Ig-like domains 3-5 (FLNa3-5) / 測定日: 2017年2月10日 / セル温度: 20 °C / 照射時間: 1 sec. / フレーム数: 10 / 単位: 1/nm /
Min
Max
Q
0.06
4.937
距離分布関数 P(R)
ソフトウェア P(R): GNOM 4.6 / ポイント数: 366 /
Min
Max
Q
0.07648
3.513
P(R) point
4
369
R
0
7.34
結果
カーブのタイプ: merged コメント: SAXS data describing the Filamin A Ig-like domains 3-5 in solution. The experiment was done to enable comparison with the corresponding P637Q mutated fragment (SASDEP7).