Prokaryote Cells . Conclusions. Small Sub Unit 30S 16S RNA 21 proteins. Large Subunit 50S 23S & 5S RNAs 31 proteins. Bacterial Ribosome. Ribosomes. Complex structures consisting of protein and RNA Sites of protein synthesis Smaller than eucaryotic ribosomes
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molecules joined by ester bonds between the carboxyl and hydroxyl of adjacent molecules.
( Donnenberg lab at University of Maryland)
Positive chemotaxis is exhibited by the outer ring which are responding to serine, the second ring responding to aspartate, and the upper dot – non chemotactic
The E. coli on the agar plate is responding to acetate. Acetate concentration varies from 0 to 2M at the top left
Transport Across the Cell Wall
Proteins may be folded, unfolded, or partially folded
Some are completely assembled
The ABC (ATP binding cassette) transporter is one of the active transport systems of the cell, which is widespread in archaea, eubacteria, and eukaryotes (Higgins 1992). It is also known as the periplasmic binding protein-dependent transport system in Gram-negative bacteria and the binding-lipoprotein-dependent transport system in Gram-positive bacteria. The transporter shows a common global organization
Importers and exporters represent the ABC transporters. ABC transporters include nucleotide binding domains (NBD1 and NBD2), transmembrane spanning domains (MSD1 and MSD2) and solute binding proteins (SBP1 and SBP2). In the case of exporters, the SBP domains are absent. Also inherent to the ABC transporters is the conserved organizational nature of the genes involved.Mechanism
The Mxi-Spa Type III Secretory Pathway of Shigella flexneriOuter Membrane Lipoprotein, MxiM for Invasin translocationRaymond Schuch and Anthony Maurelli