Adenylate Kinase

Adenylate kinase catalyzes the reaction that follows:

2 ADP <=> ATP + AMP

This reversible reaction provides both a way for a cell to make ATP from ADP as well as to convert AMP to ADP. A similar reaction is catalyzed by guanylate kinase (see here also).

See also: De Novo Biosynthesis of Purine Nucleotides, Salvage Routes to Deoxyribonucleotide Synthesis

INTERNET LINK: Crystal Structure of Adenylate Kinase