This gene encodes a multidomain protein containing an N-terminal alpha-helical region with a coiled-coil motif, followed by a pleckstrin homology (PH) domain, an Arf-GAP domain, an ankyrin homology region, a proline-rich region, and a SLCterminal Src homology 3 (SH3) domain. The protein localizes in the Golgi apparatus and at the plasma membrane, where it colocalizes with protein tyrosine kinase 2-beta (PYK2). The encoded protein forms a stable complex with PYK2 in vivo. This interaction appears to be mediated by binding of its SH3 domain to the SLCterminal proline-rich domain of PYK2. The encoded protein is tyrosine phosphorylated by activated PYK2. It has catalytic activity for class I and II ArfGAPs in vitro, and can bind the class III Arf ARF6 without immediate GAP activity. The encoded protein is believed to function as an ARF GAP that controls ARF-mediated vesicle budding when recruited to Golgi membranes. In addition, it functions as a substrate and downstream target for PYK2 and SRC, a pathway that may be involved in the regulation of vesicular transport. Multiple transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Sep 2008]
Function:
Activates the small GTPases ARF1, ARF5 and ARF6. Regulates the formation of post-Golgi vesicles and modulates constitutive secretion. Modulates phagocytosis mediated by Fc gamma receptor and ARF6. Modulates PXN recruitment to focal contacts and cell migration.
Subcellular Location:
Cytoplasm. Golgi apparatus > Golgi stack membrane. Cell membrane. Colocalizes with F-actin and ARF6 in phagocytic cups.
Tissue Specificity:
Detected in heart, brain, placenta, kidney, monocytes and pancreas.
Post-translational modifications:
Phosphorylated on tyrosine residues by SRC and PTK2B.
Similarity:
Contains 2 ANK repeats.
Contains 1 Arf-GAP domain.
Contains 1 PH domain.
Contains 1 SH3 domain.
SWISS:
O43150
Gene ID:
8853
Database links:
Entrez Gene: 8853 Human
Entrez Gene: 211914 Mouse
Omim: 603817 Human
SwissProt: O43150 Human
SwissProt: Q7SIG6 Mouse
Unigene: 555902 Human
Unigene: 358946 Mouse
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Sample:
Cerebrum (Mouse) Lysate at 40 ug
Primary: Anti- PAG3/ASAP2 (SL21004R) at 1/1000 dilution
Secondary: IRDye800CW Goat Anti-Rabbit IgG at 1/20000 dilution
Predicted band size: 112 kD
Observed band size: 110 kD
Paraformaldehyde-fixed, paraffin embedded (rat pancreas); Antigen retrieval by boiling in sodium citrate buffer (pH6.0) for 15min; Block endogenous peroxidase by 3% hydrogen peroxide for 20 minutes; Blocking buffer (normal goat serum) at 37°C for 30min; Antibody incubation with (PAG3 ASAP2) Polyclonal Antibody, Unconjugated (SL21004R) at 1:200 overnight at 4°C, followed by operating according to SP Kit(Rabbit) (sp-0023) instructionsand DAB staining.
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