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Genetic changes lead gradually to altered protein function, making deduction of the molecular basis for activity from a sequence difficult. Comparative studies provide insights into the functional consequences of specific changes. Here we present structural and biochemical studies of NtrC4, a sigma-54 activator from Aquifex aeolicus, and compare it with NtrC1 (a paralog) and NtrC (a homolog from Salmonella...
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