Sec-ASP3 is family of bacterial proteins involved in the Sec secretory system. The family forms part of the accessory SecA2/SecY2 system specifically required to export GspB, a serine-rich repeat cell-wall glycoprotein adhesin encoded upstream in the same operon.

1: Characterization of the accessory Sec system of Staphylococcus aureus. Siboo IR, Chaffin DO, Rubens CE, Sullam PM; J Bacteriol. 2008;190:6188-6196. PMID:18621893

2: Asp2 and Asp3 interact directly with GspB, the export substrate of the Streptococcus gordonii accessory Sec System. Yen YT, Seepersaud R, Bensing BA, Sullam PM; J Bacteriol. 2011;193:3165-3174. PMID:21531800