Structure of human argininosuccinate synthetase.

• Argininosuccinate synthetase catalyzes the transformation of citrulline and aspartate into argininosuccinate and pyrophosphate using the hydrolysis of ATP to AMP and pyrophosphate. This enzymatic process constitutes the rate-limiting step in both the urea and arginine-citrulline cycles. Previous studies have investigated the crystal structures of argininosuccinate synthetase from bacterial species. In this work, the first crystal structure of human argininosuccinate synthetase in complex with the substrates citrulline and aspartate is presented. The human enzyme is compared with structures of argininosuccinate synthetase from bacteria. In addition, the structure also provides new insights into the function of the numerous clinical mutations identified in patients with type I citrullinaemia (also known as classic citrullinaemia).

Nyckelord

Adenosine Triphosphate/chemistry/metabolism

Amino Acid Sequence

Argininosuccinate Synthase/*chemistry/genetics

Binding Sites

Crystallography; X-Ray

Humans

Models; Molecular

Molecular Sequence Data

Protein Conformation

Sequence Analysis; Protein

Substrate Specificity

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