9.B.209 The DUF2633 (DUF2633) Family.
These small proteins of about 60 aas with 1 TMS are found in many proteobacteria. The expression of their encoding genes vary with conditions, but their functions are not known. They may function in conjunction with another transport system.
DUF2633 family member, YjgG, of 63 aas and 1 TMS.
YjgG of E. coli
Putative exported protein of 70 aas and 1 TMS, YjgG.
YjgG of Yersinia pestis