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General secretory pathway (Sec-SRP) complex.  A biphasic pulling force may act on TMSs during translocon-mediated membrane integration (Ismail et al. 2012).  Intermediate structures for the insertion of integral membrane proteins have been visualized (Bischoff et al. 2014).  Insertion of the Type II single span (N-terminus, in, C-terminus, out) protein, RodZ, requires only SecYEG, SecA and the pmf, but not SecB, SecDF, YidC or FtsY (Rawat et al. 2015).  The combined effects of ribosome and peptide binding to SecYEG may allow for co-translational membrane insertion of successive transmembrane segments (Ge et al. 2014). SecA penetrates deeply into the SecYEG channel during insertion, contacting transmembrane helices and periplasmic loops (Banerjee et al. 2017). A partially inserted nascent chain unzips the Sec translocon's lateral gate (Kater et al. 2019). Cardiolipin (CL) is required in vivo for the stability of the bacterial translocon (SecYEG) as well as its efficient function in co-translational insertion into and translocation across the inner membrane of E. coli (Ryabichko et al. 2020). PpiD (623 aas and 1 N-terminal TMS), a peptidyl-prolyl cis-trans isomerase D, and YfgM (206 aas and 1 N-terminal TMS) facilitate the transport of toxins into the E. coli cell in a SecY-dependent process (Jones et al. 2021). Synchronized real-time measurement of Sec-mediated protein translocation has been described (Gupta et al. 2021). An extracellular cutinase from Amycolatopsis mediterranei (AmCut) is able to degrade the plastics, polycaprolactone and polybutylene succinate (Tan et al. 2022). It is secreted from E. coli using the Sec system for export across the inner membrane, and possibly, a non-classical secretion pathway for export across the outer membrane (Tan et al. 2022).

Accession Number:P0AAQ6
Protein Name:Uncharacterized protein ybaA
Molecular Weight:13318.00
Species:Escherichia coli (strain K12) [83333]
Location1 / Topology2 / Orientation3: Secreted1
Substrate protein polypeptide chain

Cross database links:

RefSeq: AP_001105.1    NP_414989.1   
Entrez Gene ID: 948863   
Pfam: PF07237   
BioCyc: EcoCyc:EG11099-MONOMER    ECOL168927:B0456-MONOMER   
KEGG: ecj:JW0445    eco:b0456   

References (3)

[1] “Cloning and sequence analysis of the Escherichia coli 4.5 S RNA gene.”  Hsu   6208370
[2] “The complete genome sequence of Escherichia coli K-12.”  Blattner   9278503
[3] “Highly accurate genome sequences of Escherichia coli K-12 strains MG1655 and W3110.”  Hayashi   16738553

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