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Protein

Toll-like receptor 4

Gene

TLR4

Organism
Equus caballus (Horse)
Status
Reviewed-Annotation score: Annotation score: 4 out of 5-Experimental evidence at transcript leveli

Functioni

Cooperates with LY96 and CD14 to mediate the innate immune response to bacterial lipopolysaccharide (LPS). Acts via MYD88, TIRAP and TRAF6, leading to NF-kappa-B activation, cytokine secretion and the inflammatory response. Also involved in LPS-independent inflammatory responses triggered by free fatty acids, such as palmitate. In complex with TLR6, promotes sterile inflammation in monocytes/macrophages in response to oxidized low-density lipoprotein (oxLDL) or amyloid-beta 42. In this context, the initial signal is provided by oxLDL- or amyloid-beta 42-binding to CD36. This event induces the formation of a heterodimer of TLR4 and TLR6, which is rapidly internalized and triggers inflammatory response, leading to the NF-kappa-B-dependent production of CXCL1, CXCL2 and CCL9 cytokines, via MYD88 signaling pathway, and CCL5 cytokine, via TICAM1 signaling pathway, as well as IL1B secretion. Binds electronegative LDL (LDL-) and mediates the cytokine release induced by LDL- (By similarity).By similarity

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Molecular functioni

Receptor

Keywords - Biological processi

Immunity, Inflammatory response, Innate immunity

Names & Taxonomyi

Protein namesi
Recommended name:
Toll-like receptor 4
Alternative name(s):
CD_antigen: CD284
Gene namesi
Name:TLR4
OrganismiEquus caballus (Horse)
Taxonomic identifieri9796 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaLaurasiatheriaPerissodactylaEquidaeEquus
Proteomesi
  • UP000002281 Componenti: Unplaced

Subcellular locationi

  • Cell membrane By similarity; Single-pass type I membrane protein By similarity

  • Note: Upon complex formation with CD36 and TLR6, internalized through dynamin-dependent endocytosis.By similarity

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Topological domaini24 – 633ExtracellularSequence analysisAdd BLAST610
Transmembranei634 – 654HelicalSequence analysisAdd BLAST21
Topological domaini655 – 843CytoplasmicSequence analysisAdd BLAST189

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Cell membrane, Membrane

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Signal peptidei1 – 23Sequence analysisAdd BLAST23
ChainiPRO_000003472124 – 843Toll-like receptor 4Add BLAST820

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Disulfide bondi29 ↔ 40By similarity
Glycosylationi35N-linked (GlcNAc...)Sequence analysis1
Glycosylationi189N-linked (GlcNAc...)Sequence analysis1
Glycosylationi205N-linked (GlcNAc...)Sequence analysis1
Glycosylationi282N-linked (GlcNAc...)Sequence analysis1
Glycosylationi295N-linked (GlcNAc...)Sequence analysis1
Disulfide bondi391 ↔ 392By similarity
Glycosylationi498N-linked (GlcNAc...)Sequence analysis1
Glycosylationi527N-linked (GlcNAc...)Sequence analysis1
Glycosylationi576N-linked (GlcNAc...)Sequence analysis1
Disulfide bondi584 ↔ 610By similarity
Disulfide bondi586 ↔ 629By similarity
Glycosylationi626N-linked (GlcNAc...)Sequence analysis1

Keywords - PTMi

Disulfide bond, Glycoprotein

Proteomic databases

PaxDbiQ9MYW3.

Interactioni

Subunit structurei

Belongs to the lipopolysaccharide (LPS) receptor, a multi-protein complex containing at least CD14, LY96 and TLR4. Binding to bacterial LPS leads to homodimerization. Interacts with LY96 via the extracellular domain. Interacts with MYD88 and TIRAP via their respective TIR domains. Interacts with NOX4. Interacts with CNPY3 and HSP90B1; this interaction is required for proper folding in the endoplasmic reticulum. Interacts with MLK4; this interaction leads to negative regulation of TLR4 signaling. Interacts with CD36, following CD36 stimulation by oxLDL or amyloid-beta 42, and forms a heterodimer with TLR6. The trimeric complex is internalized and triggers inflammatory response. LYN kinase activity facilitates TLR4-TLR6 heterodimerization and signal initiation. Interacts with TICAM1 in response to LPS in a WDFY1-dependent manner. Interacts with WDFY1 in response to LPS. Interacts with SMPDL3B. Interacts with CEACAM1; upon lipopolysaccharide stimulation, forms a complex including TLR4 and the phosphorylated form of SYK and CEACAM1, which in turn, recruits PTPN6 that dephosphorylates SYK, reducing the production of reactive oxygen species (ROS) and lysosome disruption, which in turn, reduces the activity of the inflammasome (By similarity).By similarity

Protein-protein interaction databases

STRINGi9796.ENSECAP00000008292.

Structurei

3D structure databases

ProteinModelPortaliQ9MYW3.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini24 – 54LRRNTAdd BLAST31
Repeati55 – 76LRR 1Add BLAST22
Repeati79 – 100LRR 2Add BLAST22
Repeati103 – 124LRR 3Add BLAST22
Repeati127 – 148LRR 4Add BLAST22
Repeati151 – 172LRR 5Add BLAST22
Repeati176 – 197LRR 6Add BLAST22
Repeati205 – 225LRR 7Add BLAST21
Repeati227 – 247LRR 8Add BLAST21
Repeati353 – 374LRR 9Add BLAST22
Repeati375 – 398LRR 10Add BLAST24
Repeati401 – 423LRR 11Add BLAST23
Repeati424 – 445LRR 12Add BLAST22
Repeati449 – 459LRR 13Add BLAST11
Repeati473 – 496LRR 14Add BLAST24
Repeati498 – 519LRR 15Add BLAST22
Repeati522 – 543LRR 16Add BLAST22
Repeati546 – 569LRR 17Add BLAST24
Domaini580 – 631LRRCTAdd BLAST52
Domaini674 – 820TIRPROSITE-ProRule annotationAdd BLAST147

Domaini

The TIR domain mediates interaction with NOX4.By similarity

Sequence similaritiesi

Belongs to the Toll-like receptor family.Curated
Contains 17 LRR (leucine-rich) repeats.Curated
Contains 1 LRRCT domain.Curated
Contains 1 LRRNT domain.Curated
Contains 1 TIR domain.PROSITE-ProRule annotation

Keywords - Domaini

Leucine-rich repeat, Repeat, Signal, Transmembrane, Transmembrane helix

Phylogenomic databases

eggNOGiKOG4641. Eukaryota.
COG4886. LUCA.
HOGENOMiHOG000037951.
HOVERGENiHBG018823.
InParanoidiQ9MYW3.
KOiK10160.

Family and domain databases

Gene3Di3.40.50.10140. 1 hit.
3.80.10.10. 3 hits.
InterProiIPR000483. Cys-rich_flank_reg_C.
IPR032675. L_dom-like.
IPR001611. Leu-rich_rpt.
IPR003591. Leu-rich_rpt_typical-subtyp.
IPR000157. TIR_dom.
IPR027168. TLR4.
[Graphical view]
PANTHERiPTHR24365:SF230. PTHR24365:SF230. 2 hits.
PfamiPF13516. LRR_6. 1 hit.
PF13855. LRR_8. 3 hits.
PF01582. TIR. 1 hit.
[Graphical view]
SMARTiSM00369. LRR_TYP. 11 hits.
SM00082. LRRCT. 1 hit.
SM00255. TIR. 1 hit.
[Graphical view]
SUPFAMiSSF52200. SSF52200. 1 hit.
PROSITEiPS51450. LRR. 12 hits.
PS50104. TIR. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

Sequence processingi: The displayed sequence is further processed into a mature form.

Q9MYW3-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MMPPTRLAGT LIPAMAFLSC LRPESWDPCV QVVPNTTYQC MDLNLYKIPE
60 70 80 90 100
NIPTSTKELD LSFNPLKELG SHSFSNFPEL QVLDLSRCEI EMIEDDAYQG
110 120 130 140 150
LNHLSTLILT GNPIRSLALG AFSGLSSLQT LVAVETKLSS LEKFPIGHLK
160 170 180 190 200
TLKELNVAHN LIHSFKLPEY FSKMPNLEHL DLSNNKIQNI SHEDLRVLHQ
210 220 230 240 250
MPLLNLSLDL SLNPLEFIQP DAFKEIKLHK LTLRSNFDSI DVMKSCIQGL
260 270 280 290 300
AGLKVNRLVL GEFKNERKLE RFDTSALRGL HNLTIEEFRL AYIDNYSSKD
310 320 330 340 350
SIDLLNCLAD ISKISLVSLD LGNLKDFPKG FGWQDFELVN CRIEGFPTLE
360 370 380 390 400
LTSLKRLVFT SNKDMKSFNE VKLPSLEFLD LSRNRLSFKS CCSEADLKTT
410 420 430 440 450
RLKHLDLSFN DVISMSSNFM GLEQLEHLDF QHSTLKQASD FPVFLSLKNL
460 470 480 490 500
RYLDISYTNT RVVFHGIFDG LVSLQVLKMA GNSFKDNFLP NIFREMTNLT
510 520 530 540 550
TLDLSKCNLE QVSQEAFCLL PRLRVLNMSH NNLLFLDMLP YKPLHSLQIL
560 570 580 590 600
DCSFNRIVAF KWQELQHFPS SLASLNLTQN DFACVCEYQS FLQWVKDQRQ
610 620 630 640 650
LLVEVEHLVC AIPLQMRGMP VLGFNNATCQ ISKTIVGGSV FSILMVSVIA
660 670 680 690 700
VLVYKFYFHL MLLAGCKKYG RGESIYDAFV IYSSQDEDWV RNELVKNLEE
710 720 730 740 750
GVPPFQLCLH YRDFIPGVAI AANIIQEGFH KSRKVIVVVS QHFIQSRWCI
760 770 780 790 800
FEYEIAQTWQ FLSSRAGIIF IVLHKLEKSL LRQQVELYRL LNRNTYLEWE
810 820 830 840
DSVLGRHIFW RRLRKALLDG KPWSPAGTAD AAESRQHDAE TST
Length:843
Mass (Da):96,496
Last modified:October 1, 2000 - v1
Checksum:iB5976898AD6F7A69
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY005808 mRNA. Translation: AAF91076.1.
RefSeqiNP_001093239.2. NM_001099769.2.
UniGeneiEca.18311.

Genome annotation databases

GeneIDi100066890.
KEGGiecb:100066890.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY005808 mRNA. Translation: AAF91076.1.
RefSeqiNP_001093239.2. NM_001099769.2.
UniGeneiEca.18311.

3D structure databases

ProteinModelPortaliQ9MYW3.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi9796.ENSECAP00000008292.

Proteomic databases

PaxDbiQ9MYW3.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

GeneIDi100066890.
KEGGiecb:100066890.

Organism-specific databases

CTDi7099.

Phylogenomic databases

eggNOGiKOG4641. Eukaryota.
COG4886. LUCA.
HOGENOMiHOG000037951.
HOVERGENiHBG018823.
InParanoidiQ9MYW3.
KOiK10160.

Family and domain databases

Gene3Di3.40.50.10140. 1 hit.
3.80.10.10. 3 hits.
InterProiIPR000483. Cys-rich_flank_reg_C.
IPR032675. L_dom-like.
IPR001611. Leu-rich_rpt.
IPR003591. Leu-rich_rpt_typical-subtyp.
IPR000157. TIR_dom.
IPR027168. TLR4.
[Graphical view]
PANTHERiPTHR24365:SF230. PTHR24365:SF230. 2 hits.
PfamiPF13516. LRR_6. 1 hit.
PF13855. LRR_8. 3 hits.
PF01582. TIR. 1 hit.
[Graphical view]
SMARTiSM00369. LRR_TYP. 11 hits.
SM00082. LRRCT. 1 hit.
SM00255. TIR. 1 hit.
[Graphical view]
SUPFAMiSSF52200. SSF52200. 1 hit.
PROSITEiPS51450. LRR. 12 hits.
PS50104. TIR. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiTLR4_HORSE
AccessioniPrimary (citable) accession number: Q9MYW3
Entry historyi
Integrated into UniProtKB/Swiss-Prot: February 11, 2002
Last sequence update: October 1, 2000
Last modified: October 5, 2016
This is version 109 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.