An Actinobacillus succinogenes plasmid vector which provides a means to overexpress proteins in A. succinogenes . The plasmid can be transformed efficiently by electroporation, and replicates in a stable manner in A. succinogenes . The plasmid comprises at least one marker gene, operably linked to a first promoter functional in Actinobacillus succinogenes , an origin of replication functional in Actinobacillus succinogenes , a second promoter isolated from Actinobacillus succinogenes , and a cloning site downstream from the second promoter. Plasmids pLGZ901, pLGZ920, pLGZ921, and pLGZ922 are disclosed. The pckA gene polypeptide sequence and nucleic acid sequence of Actinobacillus succinogenes , including the promoter and ribosome binding site, is disclosed. Furthermore, a method for producing a recombinant Actinobacillus succinogenes is described, including a method of transformation. Additionally, a recombinant Actinobacillus succinogenes is disclosed and a method for producing succinate utilizing this recombinant Actinobacillus succinogenes is described.
1. An isolated polypeptide which comprises the amino acid sequence set forth in SEQ ID NO: 22.