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The crystal structure of beef liver catalase was determined abinitio in projection to 9 Å resolution using electron diffraction data at room temperature from hydrated specimens maintained in an environmental chamber in the electron microscope. A conservative combination of symbolic addition with maximum entropy and likelihood led to a model with a Patterson correlation coefficient to the observed data. This independent solution could then be compared favorably to a previous 23 Å analysis of electron micrographs from frozen hydrated preparations. Prediction of the higher‐resolution structure by extension of the lower‐resolution image‐based phase basis set also gave a good match to the direct‐methods solution, particularly for the most intense reflections.
Acta Crystallographica Section A Foundations of Crystallography – Wiley
Published: Jan 1, 1999
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