Enables GDP binding activity and succinate-CoA ligase (GDP-forming) activity. Involved in succinate metabolic process; succinyl-CoA metabolic process; and tricarboxylic acid cycle. Located in mitochondrion. Part of succinate-CoA ligase complex (GDP-forming). Orthologous to human SUCLG2 (succinate-CoA ligase GDP-forming subunit beta). [provided by Alliance of Genome Resources, Apr 2022]