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Science 1 July 1977:
Vol. 197. no. 4298, pp. 72 - 74
DOI: 10.1126/science.867052
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Articles

Science, Vol 197, Issue 4298, 72-74
Copyright © 1977 by American Association for the Advancement of Science

articles

Freeze-fractured purple membrane particles: protein content

KA Fisher and W Stoeckenius

Optical diffraction and image reconstruction can be used to correlate the electron microscope image of the biological membrane with its electron density projection. Such correlation shows that a single purple membrane particle contains 9 to 12 protein molecules--63 to 84 transmembrane alpha helices--a complexity two to ten times greater than that previously suggested for membrane particles.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)