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inlB

Gene
inlB
Protein
Internalin B
Organism
Listeria monocytogenes serotype 1/2a (strain EGD / Mackaness)
Length
630 amino acids
Function
Mediates the entry of L.monocytogenes into normally non-phagocytic mammalian host cells (Probable) (PubMed:9282740, PubMed:11081636). Its host receptor is hepatocyte growth factor receptor (HGF receptor, a tyrosine kinase, MET) which is tyrosine-phosphorylated in response to InlB in human, green monkey, mouse and dog cell lines (PubMed:11081636, PubMed:15049825). Downstream adapter proteins GAB1 and CBL are phosphorylated in response to InlB, which also causes cell colony scattering (PubMed:11081636). InlB binding to mammalian cells is saturable and inhibited by EDTA; InlB-coated beads can be taken up by host cells (PubMed:10747014). Complement component 1 Q subcomponent-binding protein (gC1q-R, C1QBP) might act as an InlB receptor, leading to activation of PI3-kinase in green monkey cells (PubMed:10747014). Stimulation of Tyr-phosphorylation by InlB is antagonized by C1QBP, showing that potentiation of MET signaling via the GW domains is not mediated by C1QBP; the exact role of C1QBP remains to be determined (PubMed:15049825). Stimulation of Tyr-phosphorylation of MET by InlB is potentiated by the InlB GW domains and glycosaminoglycans such as heparin; exogenously added InlB, or hepatocyte growth factor (HGF) will also substitute for bacterial InlB, suggesting InlB promotes bacterial invasion by mimicking the hormone HGF (PubMed:15049825). May stimulate phosphatidylinositol 4,5-bisphosphate 3-kinase (PI3-kinase) in green monkey cells, has less effect in humans as PI3-kinase is constitutively and highly expressed in Caco cells (Probable). Binds heparin; C1QBP and heparin seem to bind to the GW domains (PubMed:12411480).
Similarity
Belongs to the internalin family.
Mass
71.221 kDa
Sequence
MKEKHNPRRKYCLISGLAIIFSLWIIIGNGAKVQAETITVSTPIKQIFPDDAFAETIKDNLKKKSVTDAVTQNELNSIDQIIANNSDIKSVQGIQYLPNVTKLFLNGNKLTDIKPLTNLKNLGWLFLDENKIKDLSSLKDLKKLKSLSLEHNGISDINGLVHLPQLESLYLGNNKITDITVLSRLTKLDTLSLEDNQISDIVPLAGLTKLQNLYLSKNHISDLRALAGLKNLDVLELFSQECLNKPINHQSNLVVPNTVKNTDGSLVTPEIISDDGDYEKPNVKWHLPEFTNEVSFIFYQPVTIGKAKARFHGRVTQPLKEVYTVSYDVDGTVIKTKVEAGTRITAPKPPTKQGYVFKGWYTEKNGGHEWNFNTDYMSGNDFTLYAVFKAETTEKTVNLTRYVKYIRGNAGIYKLPREDNSLKQGTLASHRCKALTVDREARNGGKLWYRLKNIGWTKAENLSLDRYDKMEYDKGVTAYARVRNASGNSVWTKPYNTAGAKHVNKLSVYQGKNMRILREAKTPITTWYQFSIGGKVIGWVDTRALNTFYKQSMEKPTRLTRYVSANKAGESYYKVPVADNPVKRGTLAKYKNQKLIVDCQATIEGQLWYRIRTSSTFIGWTKAANLRAQK

Gene
inlB
Protein
Internalin B
Organism
Listeria monocytogenes serovar 1/2a (strain ATCC BAA-679 / EGD-e)
Length
630 amino acids
Function
Mediates the entry of L.monocytogenes into normally non-phagocytic mammalian host cells (PubMed:19900460). Its host receptor is hepatocyte growth factor receptor (HGF receptor, a tyrosine kinase, MET) which is tyrosine-phosphorylated in response to InlB. Downstream targets MAPK1/MAPK3 (Erk1/2) and AKT are phosphorylated in response to InlB, which also causes cell colony scattering (PubMed:19900460, PubMed:21345802, PubMed:22887347, PubMed:27789707). Complement component 1 Q subcomponent-binding protein (gC1q-R, C1QBP) has been suggested to also act an InlB receptor, but this is less certain. Stimulation of Tyr-phosphorylation of MET by InlB is potentiated by the InlB GW domains and glycosaminoglycans such as heparin (By similarity).
Similarity
Belongs to the internalin family.
Mass
71.147 kDa
Sequence
MKEKHNPRRKYCLISGLAIIFSLWIIIGNGAKVQAETITVPTPIKQIFSDDAFAETIKDNLKKKSVTDAVTQNELNSIDQIIANNSDIKSVQGIQYLPNVTKLFLNGNKLTDIKPLANLKNLGWLFLDENKVKDLSSLKDLKKLKSLSLEHNGISDINGLVHLPQLESLYLGNNKITDITVLSRLTKLDTLSLEDNQISDIVPLAGLTKLQNLYLSKNHISDLRALAGLKNLDVLELFSQECLNKPINHQSNLVVPNTVKNTDGSLVTPEIISDDGDYEKPNVKWHLPEFTNEVSFIFYQPVTIGKAKARFHGRVTQPLKEVYTVSYDVDGTVIKTKVEAGTRITAPKPPTKQGYVFKGWYTEKNGGHEWNFNTDYMSGNDFTLYAVFKAETTEKAVNLTRYVKYIRGNAGIYKLPREDNSLKQGTLASHRCKALTVDREARNGGKLWYRLKNIGWTKAENLSLDRYDKMEYDKGVTAYARVRNASGNSVWTKPYNTAGAKHVNKLSVYQGKNMRILREAKTPITTWYQFSIGGKVIGWVDTRALNTFYKQSMEKPTRLTRYVSANKAGESYYKVPVADNPVKRGTLAKYKNQKLIVDCQATIEGQLWYRIRTSSTFIGWTKAANLRAQK