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The PutA flavoprotein from Escherichia coli combines DNA-binding, proline dehydrogenase (PRODH), and Δ 1 -pyrroline-5-carboxylate dehydrogenase (P5CDH) activities onto a single polypeptide. Recently, an X-ray crystal structure of PutA residues 87-612 was solved which identified a D370-Y540 hydrogen bond pair in the PRODH active site that appears to have an important role in shaping proline...
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