Reference: Darst SA, et al. (1991) Two-dimensional and epitaxial crystallization of a mutant form of yeast RNA polymerase II. J Mol Biol 221(1):347-57

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Abstract


A mutant form of yeast RNA polymerase II that lacks the fourth and seventh largest subunits, referred to as pol II delta 4/7, crystallized on positively charged lipid layers. Both single-layered (two-dimensional) crystals and several multi-layered crystal forms were obtained. The two-dimensional crystals, preserved in negative stain, diffracted strongly to about 1/20 A-1 and more weakly to 1/13 A-1 resolution. A projection map computed from averaged Fourier transforms revealed four pol II delta 4/7 complexes per unit cell and further revealed a cleft on the surface of the complex similar to that previously observed in the structure of Escherichia coli RNA polymerase. One of the multi-layered crystal forms, preserved in negative stain, diffracted strongly beyond 1/15 A-1 resolution. Coherent diffraction from the multi-layered crystal is indicative of protein-protein interactions between layers and ordering in the third dimension.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't | Research Support, U.S. Gov't, P.H.S.
Authors
Darst SA, Kubalek EW, Edwards AM, Kornberg RD
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