Involved in succinate export with YjjP. Both proteins are required for export (PubMed:28673128). Contributes to succinate production under both aerobic and anaerobic conditions (PubMed:28673128). The transporter is composed of YjjB and YjjP. Deletion of yjjPB decreases succinate production in E.coli by 70% under anaerobic conditions. YjjPB constitutes a split-type ThrE family transporter. Belongs to the ThrE exporter (TC 2.A.79) family.