Original Literature | Model OverView |
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Publication
Title
A Toll-like receptor in horseshoe crabs.
Affiliation
Department of Biology, Faculty of Sciences, Kyushu University, Fukuoka, Japan.
Abstract
Non-self-recognition of invading microbes relies on the pattern-recognition ofpathogen-associated molecular patterns (PAMPs) derived from microbial cell-wallcomponents. Insects and mammals conserve a signaling pathway of the innateimmune system through cell-surface receptors called Tolls and Toll-likereceptors (TLRs). Bacterial lipopolysaccharides (LPSs) are an important triggerof the horseshoe crab's innate immunity to infectious microorganisms. Horseshoecrabs' granular hemocytes respond specifically to LPS stimulation, inducing thesecretion of various defense molecules from the granular hemocytes. Here, weshow a cDNA which we named tToll, coding for a TLR identified from hemocytes ofthe horseshoe crab Tachypleus tridentatus. tToll is most closely related toDrosophila Toll in both domain architecture and overall length. Human TLRs havebeen suggested to contain numerous PAMP-binding insertions located in theleucine-rich repeats (LRRs) of their ectodomains. However, the LRRs of tTollcontained no obvious PAMP-binding insertions. Furthermore, tToll wasnon-specifically expressed in horseshoe crab tissues. These observations suggestthat tToll does not function as an LPS receptor on granular hemocytes.
PMID
15199958
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stoichiometry:c1 : 1
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PMID: 15199958,8808632 In the embryo, a proteolytic cascade that includes three proteases (gastrulation defective, snake, and easter) cleaves a cytokine-like protein, Spaetzle, as a ligand for dToll
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PMID: 15199958 The activated factor C activates factor B, which converts the proclotting enzyme into the clotting enzyme, which in turn converts coagulogen into an insoluble coagulin gel
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PMID: 15199958 The activated factor C activates factor B, which converts the proclotting enzyme into the clotting enzyme, which in turn converts coagulogen into an insoluble coagulin gel
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PMID: 15199958 The activated factor C activates factor B, which converts the proclotting enzyme into the clotting enzyme, which in turn converts coagulogen into an insoluble coagulin gel
--
and
mass
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coefficient2:1.0
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PMID: 15199958 The activated factor G activates the proclotting enzyme directly
--
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mass
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coefficient2:1.0
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PMID: 15199958 The horseshoe crab coagulation cascade promotes prophenoloxidase activation through the non-enzymatic interaction of factor B or through the interaction of proclotting enzyme with hemocyanin.
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PMID: 15199958,10359581 TLR-4 forms a complex with an accessory protein MD-2, and it triggers the innate immune response to LPS
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PMID: 15199958,10359581 TLR-4 forms a complex with an accessory protein MD-2, and it triggers the innate immune response to LPS
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PMID: 15199958,11130078 Furthermore, in TLR-9, which is essential for recognizing and triggering the inflammatory response to bacterial DNA containing CpG sequences, long inserts are present in repeat-2, repeat-5, and repeat-8 after position 10
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PMID: 15199958,3512266 These serine protease zymogens are autocatalytically activated by LPS and b-1,3-glucans, respectively.
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nodelay
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0
PMID: 15199958,8808632 In the embryo, a proteolytic cascade that includes three proteases (gastrulation defective, snake, and easter) cleaves a cytokine-like protein, Spaetzle, as a ligand for dToll
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c6 : 1
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m12*m5*0.1
nodelay
--
0
PMID: 15199958,8808632 In the embryo, a proteolytic cascade that includes three proteases (gastrulation defective, snake, and easter) cleaves a cytokine-like protein, Spaetzle, as a ligand for dToll
--
and
mass
coefficient1:0.1
coefficient2:1.0
stoichiometry:c10 : 1
stoichiometry:c11 : 1
stoichiometry:c12 : 1
m14*m6*0.1
nodelay
--
0
PMID: 15199958,8808632 In the embryo, a proteolytic cascade that includes three proteases (gastrulation defective, snake, and easter) cleaves a cytokine-like protein, Spaetzle, as a ligand for dToll
--
and
mass
coefficient1:0.1
coefficient2:1.0
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nodelay
--
0
PMID: 15199958,1209870,11812988 During infection, the cleaved form of Spaetzle is produced through another proteolytic cascade, one that includes Persephone, a newly identified serine protease.
--
and
mass
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coefficient2:1.0
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nodelay
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PMID: 15199958,12359879 Overexpression of peptidoglycan-recognition protein-LE, a receptor for the diaminopimelic acid-type peptidoglycan, leads to the activation of prophenoloxidase cascade in Drosophila larvae
--
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mass
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coefficient2:1.0
stoichiometry:c19 : 1
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nodelay
--
0
PMID: 15199958,12359879 Overexpression of peptidoglycan-recognition protein-LE, a receptor for the diaminopimelic acid-type peptidoglycan, leads to the activation of prophenoloxidase cascade in Drosophila larvae
--
and
mass
coefficient1:0.1
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nodelay
--
0
PMID: 15199958,7822328 These serine protease zymogens are autocatalytically activated by LPS and b-1,3-glucans, respectively.
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