+
Open data
-
Basic information
Entry | ![]() | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Title | Human heparan sulfate polymerase complex EXT1-EXT2 | ||||||||||||
![]() | |||||||||||||
![]() |
| ||||||||||||
Function / homology | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | ||||||||||||
Biological species | ![]() ![]() | ||||||||||||
Method | ![]() ![]() | ||||||||||||
![]() | Leisico F / Omeiri J / Hons M / Schoehn G / Lortat-Jacob H / Wild R | ||||||||||||
Funding support | ![]()
| ||||||||||||
![]() | ![]() Title: Structure of the human heparan sulfate polymerase complex EXT1-EXT2. Authors: Francisco Leisico / Juneina Omeiri / Christine Le Narvor / Joël Beaudouin / Michael Hons / Daphna Fenel / Guy Schoehn / Yohann Couté / David Bonnaffé / Rabia Sadir / Hugues Lortat-Jacob / Rebekka Wild / ![]() Abstract: Heparan sulfates are complex polysaccharides that mediate the interaction with a broad range of protein ligands at the cell surface. A key step in heparan sulfate biosynthesis is catalyzed by the bi- ...Heparan sulfates are complex polysaccharides that mediate the interaction with a broad range of protein ligands at the cell surface. A key step in heparan sulfate biosynthesis is catalyzed by the bi-functional glycosyltransferases EXT1 and EXT2, which generate the glycan backbone consisting of repeating N-acetylglucosamine and glucuronic acid units. The molecular mechanism of heparan sulfate chain polymerization remains, however, unknown. Here, we present the cryo-electron microscopy structure of human EXT1-EXT2, which reveals the formation of a tightly packed hetero-dimeric complex harboring four glycosyltransferase domains. A combination of in vitro and in cellulo mutational studies is used to dissect the functional role of the four catalytic sites. While EXT1 can catalyze both glycosyltransferase reactions, our results indicate that EXT2 might only have N-acetylglucosamine transferase activity. Our findings provide mechanistic insight into heparan sulfate chain elongation as a nonprocessive process and lay the foundation for future studies on EXT1-EXT2 function in health and disease. | ||||||||||||
History |
|
-
Structure visualization
Supplemental images |
---|
-
Downloads & links
-EMDB archive
Map data | ![]() | 79.2 MB | ![]() | |
---|---|---|---|---|
Header (meta data) | ![]() ![]() | 20.6 KB 20.6 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 11.4 KB | Display | ![]() |
Images | ![]() | 182 KB | ||
Masks | ![]() | 125 MB | ![]() | |
Others | ![]() ![]() ![]() | 98.7 MB 98.5 MB 98.7 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 652.1 KB | Display | ![]() |
---|---|---|---|---|
Full document | ![]() | 651.7 KB | Display | |
Data in XML | ![]() | 18.6 KB | Display | |
Data in CIF | ![]() | 24.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7zayMC M: atomic model generated by this map C: citing same article ( |
---|---|
Similar structure data | Similarity search - Function & homology ![]() |
-
Links
EMDB pages | ![]() ![]() |
---|---|
Related items in Molecule of the Month |
-
Map
File | ![]() | ||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.84 Å | ||||||||||||||||||||||||||||||||||||
Density |
| ||||||||||||||||||||||||||||||||||||
Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
|
-Supplemental data
-Mask #1
File | ![]() | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & Slices |
| ||||||||||||
Density Histograms |
-Additional map: #1
File | emd_14582_additional_1.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & Slices |
| ||||||||||||
Density Histograms |
-Half map: #2
File | emd_14582_half_map_1.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & Slices |
| ||||||||||||
Density Histograms |
-Half map: #1
File | emd_14582_half_map_2.map | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Projections & Slices |
| ||||||||||||
Density Histograms |
-
Sample components
-Entire : Hetero-dimeric complex EXT1-EXT2
Entire | Name: Hetero-dimeric complex EXT1-EXT2 |
---|---|
Components |
|
-Supramolecule #1: Hetero-dimeric complex EXT1-EXT2
Supramolecule | Name: Hetero-dimeric complex EXT1-EXT2 / type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: #1-#2 Details: local resolution-filtered map generated using a B-factor of -30 A2 |
---|---|
Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 160 KDa |
-Macromolecule #1: Exostosin-1
Macromolecule | Name: Exostosin-1 / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO EC number: ![]() |
---|---|
Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 85.261859 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: GASRASRSHS RREEHSGRNG LHHPSPDHFW PRFPDALRPF VPWDQLENED SSVHISPRQK RDANSSIYKG KKCRMESCFD FTLCKKNGF KVYVYPQQKG EKIAESYQNI LAAIEGSRFY TSDPSQACLF VLSLDTLDRD QLSPQYVHNL RSKVQSLHLW N NGRNHLIF ...String: GASRASRSHS RREEHSGRNG LHHPSPDHFW PRFPDALRPF VPWDQLENED SSVHISPRQK RDANSSIYKG KKCRMESCFD FTLCKKNGF KVYVYPQQKG EKIAESYQNI LAAIEGSRFY TSDPSQACLF VLSLDTLDRD QLSPQYVHNL RSKVQSLHLW N NGRNHLIF NLYSGTWPDY TEDVGFDIGQ AMLAKASIST ENFRPNFDVS IPLFSKDHPR TGGERGFLKF NTIPPLRKYM LV FKGKRYL TGIGSDTRNA LYHVHNGEDV VLLTTCKHGK DWQKHKDSRC DRDNTEYEKY DYREMLHNAT FCLVPRGRRL GSF RFLEAL QAACVPVMLS NGWELPFSEV INWNQAAVIG DERLLLQIPS TIRSIHQDKI LALRQQTQFL WEAYFSSVEK IVLT TLEII QDRIFKHISR NSLIWNKHPG GLFVLPQYSS YLGDFPYYYA NLGLKPPSKF TAVIHAVTPL VSQSQPVLKL LVAAA KSQY CAQIIVLWNC DKPLPAKHRW PATAVPVVVI EGESKVMSSR FLPYDNIITD AVLSLDEDTV LSTTEVDFAF TVWQSF PER IVGYPARSHF WDNSKERWGY TSKWTNDYSM VLTGAAIYHK YYHYLYSHYL PASLKNMVDQ LANCEDILMN FLVSAVT KL PPIKVTQKKQ YKETMMGQTS RASRWADPDH FAQRQSCMNT FASWFGYMPL IHSQMRLDPV LFKDQVSILR KKYRDIER L NNNNNNGHHH HHHHH |
-Macromolecule #2: Exostosin-2
Macromolecule | Name: Exostosin-2 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO EC number: ![]() |
---|---|
Source (natural) | Organism: ![]() ![]() |
Molecular weight | Theoretical: 79.056836 KDa |
Recombinant expression | Organism: ![]() ![]() |
Sequence | String: GASPHSIESS NDWNVEKRSI RDVPVVRLPA DSPIPERGDL SCRMHTCFDV YRCGFNPKNK IKVYIYALKK YVDDFGVSVS NTISREYNE LLMAISDSDY YTDDINRACL FVPSIDVLNQ NTLRIKETAQ AMAQLSRWDR GTNHLLFNML PGGPPDYNTA L DVPRDRAL ...String: GASPHSIESS NDWNVEKRSI RDVPVVRLPA DSPIPERGDL SCRMHTCFDV YRCGFNPKNK IKVYIYALKK YVDDFGVSVS NTISREYNE LLMAISDSDY YTDDINRACL FVPSIDVLNQ NTLRIKETAQ AMAQLSRWDR GTNHLLFNML PGGPPDYNTA L DVPRDRAL LAGGGFSTWT YRQGYDVSIP VYSPLSAEVD LPEKGPGPRQ YFLLSSQVGL HPEYREDLEA LQVKHGESVL VL DKCTNLS EGVLSVRKRC HKHQVFDYPQ VLQEATFCVV LRGARLGQAV LSDVLQAGCV PVVIADSYIL PFSEVLDWKR ASV VVPEEK MSDVYSILQS IPQRQIEEMQ RQARWFWEAY FQSIKAIALA TLQIINDRIY PYAAISYEEW NDPPAVKWGS VSNP LFLPL IPPQSQGFTA IVLTYDRVES LFRVITEVSK VPSLSKLLVV WNNQNKNPPE DSLWPKIRVP LKVVRTAENK LSNRF FPYD EIETEAVLAI DDDIIMLTSD ELQFGYEVWR EFPDRLVGYP GRLHLWDHEM NKWKYESEWT NEVSMVLTGA AFYHKY FNY LYTYKMPGDI KNWVDAHMNC EDIAMNFLVA NVTGKAVIKV TPRKKFKCPE CTAIDGLSLD QTHMVERSEC INKFASV FG TMPLKVVEHR ADPVLYKDDF PEKLKSFPNI GSLNNNNNNG HHHHHHHH |
-Macromolecule #4: 2-acetamido-2-deoxy-beta-D-glucopyranose
Macromolecule | Name: 2-acetamido-2-deoxy-beta-D-glucopyranose / type: ligand / ID: 4 / Number of copies: 1 / Formula: NAG |
---|---|
Molecular weight | Theoretical: 221.208 Da |
Chemical component information | ![]() ChemComp-NAG: |
-Macromolecule #5: URIDINE-5'-DIPHOSPHATE
Macromolecule | Name: URIDINE-5'-DIPHOSPHATE / type: ligand / ID: 5 / Number of copies: 1 / Formula: UDP |
---|---|
Molecular weight | Theoretical: 404.161 Da |
Chemical component information | ![]() ChemComp-UDP: |
-Experimental details
-Structure determination
Method | ![]() |
---|---|
![]() | ![]() |
Aggregation state | particle |
-
Sample preparation
Concentration | 0.4 mg/mL |
---|---|
Buffer | pH: 7.2 |
Grid | Model: Quantifoil R1.2/1.3 / Material: COPPER / Pretreatment - Type: GLOW DISCHARGE |
Vitrification | Cryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV |
Details | Purified EXT1-EXT2 complex at 0.4mg/mL was mixed with 1mM of UDP-GlcNAc, 1mM UDP-GlcA and 1mM MnCl2 and incubated 15 min on ice before applying 4 uL of the sample onto a glow discharged Quantifoil holey carbon grid (R1.2/1.3, 300 mesh, copper). |
-
Electron microscopy
Microscope | FEI TITAN KRIOS |
---|---|
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: OTHER / Imaging mode: BRIGHT FIELD![]() |
Image recording | Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 46.0 e/Å2 |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |