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Mô phỏng động lực học phân tử nhiệt độ thấp của cytochrome c tim ngựa và so sánh với dữ liệu tán xạ neutron không đàn hồi
Tóm tắt
Mô phỏng động lực học phân tử (MD) kết hợp với tán xạ neutron không đàn hồi có thể cung cấp thông tin về động học nhiệt của protein, đặc biệt là các chế độ dao động tần số thấp chịu trách nhiệm cho sự chuyển động lớn của một số phần trong phân tử protein. Chúng tôi đã thực hiện một số mô phỏng MD trong 30 ns của cytochrome c (Cyt c) trong một hộp nước với nhiệt độ dao động từ 110 đến 300 K và so sánh kết quả với dữ liệu tán xạ neutron không đàn hồi thực nghiệm. Các chế độ dao động tần số thấp được thu nhận thông qua các yếu tố cấu trúc động, S(Q, ω), được lấy từ cả các thí nghiệm tán xạ neutron không đàn hồi và tính toán từ các mô phỏng MD cho Cyt c trong cùng một khoảng nhiệt độ. Sự chuyển tiếp nhiệt độ mà mọi người đều biết trong cấu trúc chuyển động của Cyt c được thể hiện rõ ràng trong các mô phỏng MD; tuy nhiên, nó bị giới hạn trong các đoạn không cấu trúc của các vòng Ω1 và Ω2; sự chuyển động của vòng cấu trúc Ω3 và cả hai đầu xoắn của protein kháng lại sự rối loạn nhiệt. Các biểu đồ S(Q, ω) tính toán và thực nghiệm nhất quán định tính tại nhiệt độ thấp, trong khi trên 200 K, một đỉnh boson biến mất khỏi các biểu đồ tính toán. Điều này có thể là do sự mất cấu trúc tinh thể của hệ protein-nước so với tinh thể protein.
Từ khóa
#Mô phỏng động lực học phân tử #cytochrome c #tán xạ neutron không đàn hồi #động học nhiệt #chế độ dao động tần số thấpTài liệu tham khảo
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