Sự Kích Thích Của Kali Đối Với Vận Chuyển IAA Do Đơn Vị Nhập Khẩu AUX1 Của Arabidopsis Thực Hiện Được Nghiên Cứu Trong Một Hệ Thống Nấm Nước Ngoài

The Journal of Membrane Biology - Tập 252 - Trang 183-194 - 2019
Li-Kun Huang1, Ya-Yun Liao1, Wei-Hua Lin1, Shih-Ming Lin2, Tzu-Yin Liu1, Ching-Hung Lee1, Rong-Long Pan1
1Department of Life Science and Institute of Bioinformatics and Structural Biology, College of Life Science, National Tsing Hua University, Hsin Chu, Republic of China
2Department of Biotechnology and Bioindustry Sciences, National Cheng Kung University, Tainan, Republic of China

Tóm tắt

Auxin điều chỉnh nhiều quá trình liên quan đến sự phát triển và sinh trưởng của thực vật. AUX1 là đơn vị nhập khẩu auxin đầu tiên được xác định và được nghiên cứu rộng rãi nhất, đóng vai trò quan trọng trong sự hướng rễ theo trọng lực và sự phát triển của rễ bên và lông rễ. Tuy nhiên, cơ chế điều chỉnh vận chuyển auxin của AUX1 vẫn chưa được hiểu rõ. Trong nghiên cứu này, chúng tôi đã xem xét ảnh hưởng của các ion kim loại đến chức năng vận chuyển của AUX1 và phát hiện rằng hoạt động của nó có thể được kích thích đặc hiệu gấp bốn lần bởi K+. Các thí nghiệm tiếp theo đã tiết lộ sự ưu tiên của KF trong việc nâng cao hoạt động vận chuyển của AUX1 so với KCl, KBr và KI. Ngoài ra, sự tương tác giữa K+ và AUX1 khiến AUX1 chịu nhiệt tốt hơn nhưng dễ bị phân hủy bởi protease. Sửa đổi hóa học thông thường cho thấy rằng các axit amin acid bên ngoài của AUX1 đóng một vai trò then chốt trong sự kích thích K+. Quá trình đột biến tại chỗ cho thấy rằng việc thay thế Asp166, Asp293, và Asp312 của AUX1 bằng alanine làm suy giảm khả năng vận chuyển auxin được kích thích bởi K+. Ngược lại, khi các dư lượng này bị đột biến thành glutamate, lysine, hoặc asparagine, chỉ có biến thể D312E phục hồi hoạt động vận chuyển IAA về mức gần với kiểu hoang dã. Do đó, chúng tôi tin rằng D312 có thể là dư lượng hứa hẹn nhất cho sự kích thích của K+ lên AUX1.

Từ khóa

#Auxin #AUX1 #vận chuyển auxin #ion kim loại #kích thích K+

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