The Ras-related superfamily of guanine nucleotide binding proteins, which includes the R-Ras, Rap, Ral/Rec and Rho/Rab subfamilies, exhibit 30-60% homology with Ras p21. Accumulating data suggests an important role for Rab proteins, either in endocytosis or in biosynthetic protein transport. The transport of newly synthesized proteins from the endoplasmic reticulum to various stacks of the Golgi complex and to secretory vesicles involves at each stage the movement of carrier vesicles, a process that appears to involve Rab protein function. The possibility that Rab proteins might also direct the exocytosis from secretory vesicles to the plasma membrane is supported by the observation that in yeast, the Sec4 protein, which is 40% homologous to Rab proteins, is associated with secretory vesicles. At least eight members of the Rab subfamily have been identified, each of which is found at a particular stage of a membrane transport pathway.
Background References
1. Suo D et al. Coronin-1 is a neurotrophin endosomal effector that is required for developmental competition for survival. Nat Neurosci 17:36-45 (2014).
2. Simon NC & Barbieri JT Exoenzyme S ADP-ribosylates Rab5 effector sites to uncouple intracellular trafficking. Infect Immun 82:21-8 (2014).
Western blot analysis of Rab5 on different lysates with Mouse anti-Rab5 antibody (HA601679) at 1/5,000 dilution.
Lane 1: HeLa (Human cervical adenocarcinoma cell) cell lysate (15 µg/Lane)
Lane 2: MCF7 (Human breast cancer cell) cell lysate (15 µg/Lane)
Lane 3: Neuro-2a (Mouse brain neuroblastoma cell) cell lysate (20 µg/Lane)
Lane 4: PC-12 (Rat pheochromocytoma cell (undifferentiated)) cell lysate (20 µg/Lane)
Exposure time: 4 seconds; ECL: K1801
Blocking: 5% NFDM/TBST, 1 hour at room temperature
Primary antibody: HA601679, 1/5,000 in primary antibody dilution buffer (K1803), overnight at 4 °C
Secondary antibody: Goat Anti-Mouse IgG-HRP (HA1006), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 24 kDa
Observed band size: 24 kDa
Application: Immunocytochemistry (IF-cell)
Species: Human
Sample: MCF7 (Human breast cancer cell)
Fixation: 4% Paraformaldehyde, 15 minutes at room temperature.
Permeabilization: 0.1% Triton X-100, 15 minutes at room temperature.
Blocking: 1% BSA + 10% normal goat serum, 1 hour at room temperature.
Antibody dilution buffer: 1% BSA in PBST.
Primary antibody: HA601679, 1/50, overnight at 4°C.
Secondary antibody: Goat Anti-Mouse IgG (iFluor™ 488, HA1125), 45 minutes at room temperature.
Counterstain: Beta tubulin (ET1602-4, red), 1/100, overnight at 4℃. The Nuclear counterstain was DAPI (Blue).
Application: Immunohistochemistry (IHC-P)
Species: Human
Tissue: Colon adenocarcinoma
Sample: Paraffin-embedded section