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Professor Andrews is distinguished for his contributions to our understanding of the mechanism of action, structure and regulation of the key photosynthetic enzyme ribulose 1,5-bisphosphate carboxylase-oxygenase (Rubisco). He shared in the discovery of the oxygenase function of Rubisco and its role in photorespiration. Since then he has made major contributions to defining aspects of Rubisco function, especially the role of the small subunit in determining catalytic competence, the carbamylation-based mechanism of regulation of the enzyme, and the factors contributing to the renowned catalytic inefficiency of the enzyme. Andrews, separately or with his colleague Lorimer, has been responsible for developing and refining key concepts about Rubisco including basic features of the mechanism of the carboxylation reaction, the consequent unavoidable nature of the oxygenase reaction and the evolutionary implications of these features.

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