▁other ▁secret ion ▁systems . ▁Among ▁Gram - negative ▁b acter ia , ▁V ib rio ▁ch ol era e , ▁Kle bs iella ▁p neum onia e , ▁and ▁Y ers in ia ▁enter oc olit ica ▁use ▁the ▁Sec ▁system . ▁St ap hy loc oc cus ▁a ure us ▁and ▁L ister ia ▁mon oc yt ogen es ▁are ▁Gram - pos itive ▁b acter ia ▁that ▁use ▁the ▁Sec ▁system . ▁ ▁The ▁Sec ▁system ▁util ises ▁two ▁different ▁path ways ▁for ▁secret ion : ▁the ▁Sec A ▁and ▁signal ▁recognition ▁particle ▁( SR P ) ▁path ways . ▁Sec A ▁is ▁an ▁ATP ase ▁motor ▁protein ▁and ▁has ▁many ▁related ▁prote ins ▁including ▁Sec D , ▁Sec E , ▁Sec F , ▁Seg G , ▁Sec M , ▁and ▁Sec Y . ▁SR P ▁is ▁a ▁rib on uc le op rote in ▁( prote in - R NA ▁complex ) ▁that ▁recogn izes ▁and ▁targets ▁specific ▁prote ins ▁to ▁the ▁end op las mic ▁ret icul um ▁in ▁e uk ary otes ▁and ▁to ▁the ▁cell ▁memb rane ▁in ▁pro k ary otes . ▁The ▁two ▁path ways ▁require ▁different ▁mole cular ▁ch aper ones ▁and ▁ultimately ▁use ▁a ▁protein - transport ing ▁channel ▁Sec Y EG ▁for ▁transport ing ▁the ▁prote ins ▁across ▁the ▁inner ▁cell ▁memb rane . ▁In ▁the ▁Sec A ▁path way , ▁Sec B ▁acts ▁as ▁a ▁ch aper one , ▁helping ▁protein ▁transport ▁to ▁the ▁peri pl asm ▁after ▁complete ▁synth