Lateral diffusion of phospholipids in a vesicle membrane.

نویسندگان

  • R D Kornberg
  • H M McConnell
چکیده

Nuclear-resonance spectra of phosphatidylcholine (PC) vesicles are broadened by spin-labeled PC. The broadening of the N-methyl proton line is proportional to spin-labeled PC concentration; the broadening by 1 molecule in 100 of spin-labeled PC is 9.7 Hz at 35 degrees C; the broadening is not due to collisions between vesicles, exchange of spin label between vesicles, or fusion of vesicles. These findings are proof of rapid diffusion in the plane of the PC bilayer (lateral diffusion). A further study of the broadening reveals the molecular frequency of the translation step for lateral diffusion to be much greater than 3 x 10(3) sec(-1) at 0 degrees C.

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عنوان ژورنال:
  • Proceedings of the National Academy of Sciences of the United States of America

دوره 68 10  شماره 

صفحات  -

تاریخ انتشار 1971