Flexibility in targeting and insertion during bacterial membrane protein biogenesis.
The biogenesis of Escherichia coli inner membrane proteins (IMPs) is assisted by targeting and insertion factors such as the signal recognition particle (SRP), the Sec-translocon and YidC with translocation of (large) periplasmic domains energized by SecA and the proton motive force (pmf). The use of these factors and forces is probably primarily determined by specific structural features of an IMP. To analyze these features we have engineered a set of model IMPs based on endogenous E. coli IMPs known to follow distinct targeting and insertion pathways. The modified model IMPs were analyzed for altered routing using an in vivo protease mapping approach. The data suggest a facultative use of different combinations of factors.
van Bloois
Edwin
E
Department of Molecular Microbiology, Institute of Molecular Cell Biology, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
ten Hagen-Jongman
Corinne M
CM
Luirink
Joen
J
D018407:Bacterial Physiological Phenomena; D001426:Bacterial Proteins / Q000737:chemistry*; D001671:Biochemistry / Q000379:methods; D002462:Cell Membrane / Q000378:metabolism; D004926:Escherichia coli / Q000378:metabolism*; D029968:Escherichia coli Proteins / Q000378:metabolism; D008565:Membrane Proteins / Q000737:chemistry*; D026901:Membrane Transport Proteins / Q000378:metabolism; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D021381:Protein Transport; D012270:Ribosomes / Q000378:metabolism; D018271:Signal Recognition Particle / Q000737:chemistry
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D008565:Membrane Proteins; D026901:Membrane Transport Proteins; D018271:Signal Recognition Particle; C412443:YIDC protein, E coli