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- EMDB-27253: Cryo-EM structure of substrate unbound PAPP-A -

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Basic information

Entry
Database: EMDB / ID: EMD-27253
TitleCryo-EM structure of substrate unbound PAPP-A
Map dataFull Map
Sample
  • Complex: PAPP-A homodimer
    • Protein or peptide: Pappalysin-1
  • Ligand: ZINC ION
Function / homology
Function and homology information


pappalysin-1 / response to follicle-stimulating hormone / protein metabolic process / response to dexamethasone / female pregnancy / protein catabolic process / metalloendopeptidase activity / metallopeptidase activity / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / cell surface receptor signaling pathway ...pappalysin-1 / response to follicle-stimulating hormone / protein metabolic process / response to dexamethasone / female pregnancy / protein catabolic process / metalloendopeptidase activity / metallopeptidase activity / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / cell surface receptor signaling pathway / proteolysis / extracellular space / zinc ion binding / extracellular region
Similarity search - Function
Pappalysin-1/2 / Myxococcus cysteine-rich repeat / LamG-like jellyroll fold / LamG-like jellyroll fold domain / Peptidase M43, pregnancy-associated plasma-A / Pregnancy-associated plasma protein-A / Concanavalin A-like lectin/glucanases superfamily / Notch domain / Domain found in Notch and Lin-12 / Sushi repeat (SCR repeat) ...Pappalysin-1/2 / Myxococcus cysteine-rich repeat / LamG-like jellyroll fold / LamG-like jellyroll fold domain / Peptidase M43, pregnancy-associated plasma-A / Pregnancy-associated plasma protein-A / Concanavalin A-like lectin/glucanases superfamily / Notch domain / Domain found in Notch and Lin-12 / Sushi repeat (SCR repeat) / Domain abundant in complement control proteins; SUSHI repeat; short complement-like repeat (SCR) / Sushi/SCR/CCP domain / Sushi/CCP/SCR domain profile. / Sushi/SCR/CCP superfamily / Metallopeptidase, catalytic domain superfamily / Neutral zinc metallopeptidases, zinc-binding region signature. / Concanavalin A-like lectin/glucanase domain superfamily
Similarity search - Domain/homology
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.35 Å
AuthorsJudge RA / Jain R / Hao Q / Ouch C / Sridar J / Smith CL / Wang JCK / Eaton D
Funding support1 items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2022
Title: Structure of the PAPP-A complex reveals mechanism of substrate recognition.
Authors: Russell A Judge / Janani Sridar / Kathryn Tunyasuvunakool / Rinku Jain / John C K Wang / Christna Ouch / Jun Xu / Amirhossein Mafi / Aaron H Nile / Clint Remarcik / Corey L Smith / Crystal ...Authors: Russell A Judge / Janani Sridar / Kathryn Tunyasuvunakool / Rinku Jain / John C K Wang / Christna Ouch / Jun Xu / Amirhossein Mafi / Aaron H Nile / Clint Remarcik / Corey L Smith / Crystal Ghosh / Chen Xu / Vincent Stoll / John Jumper / Amoolya H Singh / Dan Eaton / Qi Hao /
Abstract: Insulin-like growth factor (IGF) signaling is highly conserved and tightly regulated by proteases including Pregnancy-Associated Plasma Protein A (PAPP-A). PAPP-A and its paralog PAPP-A2 are ...Insulin-like growth factor (IGF) signaling is highly conserved and tightly regulated by proteases including Pregnancy-Associated Plasma Protein A (PAPP-A). PAPP-A and its paralog PAPP-A2 are metalloproteases that mediate IGF bioavailability through cleavage of IGF binding proteins (IGFBPs). Here, we present single-particle cryo-EM structures of the catalytically inactive mutant PAPP-A (E483A) in complex with a peptide from its substrate IGFBP5 (PAPP-A) and also in its substrate-free form, by leveraging the power of AlphaFold to generate a high quality predicted model as a starting template. We show that PAPP-A is a flexible trans-dimer that binds IGFBP5 via a 25-amino acid anchor peptide which extends into the metalloprotease active site. This unique IGFBP5 anchor peptide that mediates the specific PAPP-A-IGFBP5 interaction is not found in other PAPP-A substrates. Additionally, we illustrate the critical role of the PAPP-A central domain as it mediates both IGFBP5 recognition and trans-dimerization. We further demonstrate that PAPP-A trans-dimer formation and distal inter-domain interactions are both required for efficient proteolysis of IGFBP4, but dispensable for IGFBP5 cleavage. Together the structural and biochemical studies reveal the mechanism of PAPP-A substrate binding and selectivity.
History
DepositionJun 8, 2022-
Header (metadata) releaseSep 28, 2022-
Map releaseSep 28, 2022-
UpdateSep 28, 2022-
Current statusSep 28, 2022Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_27253.png

Downloads & links

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Map

FileDownload / File: emd_27253.map.gz / Format: CCP4 / Size: 325 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationFull Map
Voxel sizeX=Y=Z: 0.83 Å
Density
Contour LevelBy AUTHOR: 0.2298
Minimum - Maximum-2.3824487 - 3.87236
Average (Standard dev.)-0.00014056734 (±0.041807286)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions440440440
Spacing440440440
CellA=B=C: 365.19998 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Half Map B

Fileemd_27253_half_map_1.map
AnnotationHalf Map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: Half Map A

Fileemd_27253_half_map_2.map
AnnotationHalf Map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : PAPP-A homodimer

EntireName: PAPP-A homodimer
Components
  • Complex: PAPP-A homodimer
    • Protein or peptide: Pappalysin-1
  • Ligand: ZINC ION

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Supramolecule #1: PAPP-A homodimer

SupramoleculeName: PAPP-A homodimer / type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Homo sapiens (human) / Recombinant cell: HEK 293

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Macromolecule #1: Pappalysin-1

MacromoleculeName: Pappalysin-1 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO / EC number: pappalysin-1
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 176.341703 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: REARGATEEP SPPSRALYFS GRGEQLRLRA DLELPRDAFT LQVWLRAEGG QRSPAVITGL YDKCSYISRD RGWVVGIHTI SDQDNKDPR YFFSLKTDRA RQVTTINAHR SYLPGQWVYL AATYDGQFMK LYVNGAQVAT SGEQVGGIFS PLTQKCKVLM L GGSALNHN ...String:
REARGATEEP SPPSRALYFS GRGEQLRLRA DLELPRDAFT LQVWLRAEGG QRSPAVITGL YDKCSYISRD RGWVVGIHTI SDQDNKDPR YFFSLKTDRA RQVTTINAHR SYLPGQWVYL AATYDGQFMK LYVNGAQVAT SGEQVGGIFS PLTQKCKVLM L GGSALNHN YRGYIEHFSL WKVARTQREI LSDMETHGAH TALPQLLLQE NWDNVKHAWS PMKDGSSPKV EFSNAHGFLL DT SLEPPLC GQTLCDNTEV IASYNQLSSF RQPKVVRYRV VNLYEDDHKN PTVTREQVDF QHHQLAEAFK QYNISWELDV LEV SNSSLR RRLILANCDI SKIGDENCDP ECNHTLTGHD GGDCRHLRHP AFVKKQHNGV CDMDCNYERF NFDGGECCDP EITN VTQTC FDPDSPHRAY LDVNELKNIL KLDGSTHLNI FFAKSSEEEL AGVATWPWDK EALMHLGGIV LNPSFYGMPG HTHTM IHAI GHSLGLYHVF RGISEIQSCS DPCMETEPSF ETGDLCNDTN PAPKHKSCGD PGPGNDTCGF HSFFNTPYNN FMSYAD DDC TDSFTPNQVA RMHCYLDLVY QGWQPSRKPA PVALAPQVLG HTTDSVTLEW FPPIDGHFFE RELGSACHLC LEGRILV QY ASNASSPMPC SPSGHWSPRE AEGHPDVEQP CKSSVRTWSP NSAVNPHTVP PACPEPQGCY LELEFLYPLV PESLTIWV T FVSTDWDSSG AVNDIKLLAV SGKNISLGPQ NVFCDVPLTI RLWDVGEEVY GIQIYTLDEH LEIDAAMLTS TADTPLCLQ CKPLKYKVVR DPPLQMDVAS ILHLNRKFVD MDLNLGSVYQ YWVITISGTE ESEPSPAVTY IHGSGYCGDG IIQKDQGEQC DDMNKINGD GCSLFCRQEV SFNCIDEPSR CYFHDGDGVC EEFEQKTSIK DCGVYTPQGF LDQWASNASV SHQDQQCPGW V IIGQPAAS QVCRTKVIDL SEGISQHAWY PCTISYPYSQ LAQTTFWLRA YFSQPMVAAA VIVHLVTDGT YYGDQKQETI SV QLLDTKD QSHDLGLHVL SCRNNPLIIP VVHDLSQPFY HSQAVRVSFS SPLVAISGVA LRSFDNFDPV TLSSCQRGET YSP AEQSCV HFACEKTDCP ELAVENAYLN CSSSDRYHGA QCTVSCRTGY VLQIRRDDEL IKSQTGPSVT VTCTEGKWNK QVAC EPVDC SIPDHHQVYA ASFSCPEGTT FGSQCSFQCR HPAQLKGNNS LLTCMEDGLW SFPEALCELM CLAPPPVPNA DLQTA RCRE NKHKVGSFCK YKCKPGYHVP GSSRKSKKRA FKTQCTQDGS WQEGACVPVT CDPPPPKFHG LYQCTNGFQF NSECRI KCE DSDASQGLGS NVIHCRKDGT WNGSFHVCQE MQGQCSVPNE LNSNLKLQCP DGYAIGSECA TSCLDHNSES IILPMNV TV RDIPHWLNPT RVERVVCTAG LKWYPHPALI HCVKGCEPFM GDNYCDAINN RAFCNYDGGD CCTSTVKTKK VTPFPMSC D LQGDCACRDP QAQEHSRKDL RGYSHGSGPT RTRPLEQKLI SEEDLAANDI LDYKDDDDKV

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Macromolecule #2: ZINC ION

MacromoleculeName: ZINC ION / type: ligand / ID: 2 / Number of copies: 1 / Formula: ZN
Molecular weightTheoretical: 65.409 Da

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration0.25 mg/mL
BufferpH: 9.2 / Details: BTP (Bis-Tris-Propane) pH 9.2
GridModel: C-flat-1.2/1.3
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 283 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 3.5 µm / Nominal defocus min: 1.0 µm / Nominal magnification: 105000
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 47.6 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 2145158999
CTF correctionSoftware - Name: cryoSPARC (ver. 3)
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.35 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3) / Number images used: 338320
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementProtocol: OTHER
Output model

PDB-8d8o:
Cryo-EM structure of substrate unbound PAPP-A

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