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- EMDB-22328: IgA1 Protease in complex with neutralizing mAb -

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Basic information

Entry
Database: EMDB / ID: EMD-22328
TitleIgA1 Protease in complex with neutralizing mAb
Map dataIgA1 Protease with mAb
Sample
  • Complex: murine mAb in complex with Streptoccocus pneumoniae IgA1 Protease
    • Complex: Immunoglobulin A1 protease
      • Protein or peptide: Immunoglobulin A1 protease
    • Complex: mAb
      • Protein or peptide: mAB Light Chain
      • Protein or peptide: mAB Heavy Chain
KeywordsIgA1 / Protease / neutralization / IMMUNE SYSTEM
Function / homology
Function and homology information


IgA-specific metalloendopeptidase / metalloendopeptidase activity / proteolysis / extracellular region / zinc ion binding / membrane
Similarity search - Function
Peptidase M26, N-terminal domain / GLUG / Peptidase M26, C-terminal domain / M26 IgA1-specific Metallo-endopeptidase N-terminal region / M26 IgA1-specific Metallo-endopeptidase C-terminal region / The GLUG motif / G5 domain / G5 domain / G5 domain profile. / G5 ...Peptidase M26, N-terminal domain / GLUG / Peptidase M26, C-terminal domain / M26 IgA1-specific Metallo-endopeptidase N-terminal region / M26 IgA1-specific Metallo-endopeptidase C-terminal region / The GLUG motif / G5 domain / G5 domain / G5 domain profile. / G5 / YSIRK type signal peptide / YSIRK Gram-positive signal peptide / LPXTG cell wall anchor motif / Gram-positive cocci surface proteins LPxTG motif profile. / LPXTG cell wall anchor domain / Neutral zinc metallopeptidases, zinc-binding region signature.
Similarity search - Domain/homology
Immunoglobulin A1 protease / Immunoglobulin A1 protease
Similarity search - Component
Biological speciesStreptococcus pneumoniae (bacteria) / Mus musculus (house mouse)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.8 Å
AuthorsEisenmesser EZ / Zheng H
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)AI146295 United States
CitationJournal: Nat Commun / Year: 2020
Title: Mechanism and inhibition of Streptococcus pneumoniae IgA1 protease.
Authors: Zhiming Wang / Jeremy Rahkola / Jasmina S Redzic / Ying-Chih Chi / Norman Tran / Todd Holyoak / Hongjin Zheng / Edward Janoff / Elan Eisenmesser /
Abstract: Opportunistic pathogens such as Streptococcus pneumoniae secrete a giant metalloprotease virulence factor responsible for cleaving host IgA1, yet the molecular mechanism has remained unknown since ...Opportunistic pathogens such as Streptococcus pneumoniae secrete a giant metalloprotease virulence factor responsible for cleaving host IgA1, yet the molecular mechanism has remained unknown since their discovery nearly 30 years ago despite the potential for developing vaccines that target these enzymes to block infection. Here we show through a series of cryo-electron microscopy single particle reconstructions how the Streptococcus pneumoniae IgA1 protease facilitates IgA1 substrate recognition and how this can be inhibited. Specifically, the Streptococcus pneumoniae IgA1 protease subscribes to an active-site-gated mechanism where a domain undergoes a 10.0 Å movement to facilitate cleavage. Monoclonal antibody binding inhibits this conformational change, providing a direct means to block infection at the host interface. These structural studies explain decades of biological and biochemical studies and provides a general strategy to block Streptococcus pneumoniae IgA1 protease activity to potentially prevent infection.
History
DepositionJul 19, 2020-
Header (metadata) releaseDec 9, 2020-
Map releaseDec 9, 2020-
UpdateMay 28, 2025-
Current statusMay 28, 2025Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.136
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.136
  • Imaged by UCSF Chimera
  • Download
  • Surface view with fitted model
  • Atomic models: PDB-7jgj
  • Surface level: 0.136
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_22328.png

Downloads & links

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Map

FileDownload / File: emd_22328.map.gz / Format: CCP4 / Size: 129.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationIgA1 Protease with mAb
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 324 pix.
= 269.568 Å		0.83 Å/pix.
x 324 pix.
= 269.568 Å		0.83 Å/pix.
x 324 pix.
= 269.568 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.832 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.136 / Movie #1: 0.136
Minimum - Maximum-0.20760721 - 0.51163584
Average (Standard dev.)0.0010482341 (±0.021387719)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions324324324
Spacing324324324
CellA=B=C: 269.568 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.8320.8320.832
M x/y/z324324324
origin x/y/z0.0000.0000.000
length x/y/z269.568269.568269.568
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ240240240
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS324324324
D min/max/mean-0.2080.5120.001

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Supplemental data

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Sample components

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Entire : murine mAb in complex with Streptoccocus pneumoniae IgA1 Protease

EntireName: murine mAb in complex with Streptoccocus pneumoniae IgA1 Protease
Components
  • Complex: murine mAb in complex with Streptoccocus pneumoniae IgA1 Protease
    • Complex: Immunoglobulin A1 protease
      • Protein or peptide: Immunoglobulin A1 protease
    • Complex: mAb
      • Protein or peptide: mAB Light Chain
      • Protein or peptide: mAB Heavy Chain

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Supramolecule #1: murine mAb in complex with Streptoccocus pneumoniae IgA1 Protease

SupramoleculeName: murine mAb in complex with Streptoccocus pneumoniae IgA1 Protease
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all

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Supramolecule #2: Immunoglobulin A1 protease

SupramoleculeName: Immunoglobulin A1 protease / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: Streptococcus pneumoniae (bacteria)

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Supramolecule #3: mAb

SupramoleculeName: mAb / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #2-#3
Source (natural)Organism: Mus musculus (house mouse)

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Macromolecule #1: Immunoglobulin A1 protease

MacromoleculeName: Immunoglobulin A1 protease / type: protein_or_peptide / ID: 1 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Streptococcus pneumoniae (bacteria)
Molecular weightTheoretical: 145.095812 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: TEPEKKLELR NVSDIELYSQ TNGTYRQHVS LDGIPENTDT YFVKVKSSAF KDVYIPVASI TEEKRNGQSV YKITAKAEKL QQELENKYV DNFTFYLDKK AKEENTNFTS FSNLVKAINQ NPSGTYHLAA SLNANEVELG PDERSYIKDT FTGRLIGEKD G KNYAIYNL ...String:
TEPEKKLELR NVSDIELYSQ TNGTYRQHVS LDGIPENTDT YFVKVKSSAF KDVYIPVASI TEEKRNGQSV YKITAKAEKL QQELENKYV DNFTFYLDKK AKEENTNFTS FSNLVKAINQ NPSGTYHLAA SLNANEVELG PDERSYIKDT FTGRLIGEKD G KNYAIYNL KKPLFENLSG ATVEKLSLKN VAISGKNDIG SLANEATNGT KIKQVHVDGV LAGERGVGGL LAKADQSSIA ES SFKGRIV NTYETTDAYN IGGLVGHLTG KNASIAKSKA TVTISSNTNR SDQTVGGLAG LVDQDAHIQN SYAEGDINNV KHF GKVAGV AGYLWDRTSG EEKHAGELTN VLSDVNVTNG NAITGYHYTG MKVANTFSSK ANRVFNVTLE KDEVVSKESF EERG TMLDA SQIVSKKAEI NPLTLPTVEP LSTSGKKDSD FSKIAHYQAN RALVYKNIEK LLPFYNKSTI VKYGNLVKEN SLLYQ KELL SAVMMKDDQV ITDIVSNKQT ANKLLLHYND HSSEKFDLKY QTDFANLAEY NLGNTGLLYT PNQFLYDRDS IVKEVL PEL QKLDYQSDAI RKTLGISPEV KLTELYLEDQ FSKTKQNLGD SLKKLLSADA GLASDNSVTR GYLVDKIKNN KEALLLG LT YLERWYNFNY GQVNVKDLVM YHPDFFGKGN TSPLDTLIEL GKSGFNNLLA KNNVDTYGIS LASQHGATDL FSTLEHYR K VFLPNTSNND WFKSETKAYI VEEKSTIEEV KTKQGLAGTK YSIGVYDRIT SATWKYRNMV LPLLTLPERS VFVISTMSS LGFGAYDRYR SSDHKAGKAL NDFVEENARE TAKRQRDHYD YWYRILDEQS REKLYRTILL YDAYKFGDDT TSGKATAEAK FDSSNPAMK NFFGPVGNKV VHNQHGAYAT GDGVYYMSYR MLDKDGAITY THEMTHDSDQ DIYLGGYGRR NGLGPEFFAK G LLQAPDQP SDATITINSI LKHSKSDSTE GSRLQVLDPT ERFQNAADLQ NYVHNMFDLI YMMEYLEGQS IVNKLSVYQK MA ALRKIEN KYVKDPADGN EVYATNVVKE LTEAEARNLN SFESLIDHNI LSAREYQSGD YERNGYYTIK LFAPIYSALS SEK GTPGDL MGRRIAYELL AAKGFKDGMV PYISNQYEED AKQQGQTINL YGKERGLVTD ELVLKKVFDG KYKTWAEFKT AMYQ ERVDQ FGNLKQVTFK DPTKPWPSYG TKTINNVDEL QALMDQAVLK DAEGPRWSNY DPEIDSAVHK LKRAIFKAYL DQTND FRSS IFENKK

UniProtKB: Immunoglobulin A1 protease

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Macromolecule #2: mAB Light Chain

MacromoleculeName: mAB Light Chain / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 23.270615 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: EEVLTQSPAI MSASPGEKVT MTCSASSSVS YIHWYQQKSN TSPKLWIYAT SKLASGVPGR FSGSGSGNSY SLTISSMEAE DVATYYCFQ GSGYPFTFGS GTKLEIKRAD AAPTVSIFPP SSEQLTSGGA SVVCFLNNFY PKDINVKWKI DGSERQNGVL N SWTDQDSK ...String:
EEVLTQSPAI MSASPGEKVT MTCSASSSVS YIHWYQQKSN TSPKLWIYAT SKLASGVPGR FSGSGSGNSY SLTISSMEAE DVATYYCFQ GSGYPFTFGS GTKLEIKRAD AAPTVSIFPP SSEQLTSGGA SVVCFLNNFY PKDINVKWKI DGSERQNGVL N SWTDQDSK DSTYSMSSTL TLTKDEYERH NSYTCEATHK TSTSPIVKSF NRNEC

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Macromolecule #3: mAB Heavy Chain

MacromoleculeName: mAB Heavy Chain / type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 23.212004 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: EVQLQQSGPE LEKPGASMKI SCKASGYSFT GYNMNWVKQS NGKSLEWIGS IDPYTGGSNY NQKFMGKATL TVDKSSSTAY MQLKSLTSE DSAVYYCATV VGRVYAMDYW GQGTSVTVSS AKTTPPSVYP LAPGSAAQTN SMVTLGCLVK GYFPEPVTVT W NSGSLSSG ...String:
EVQLQQSGPE LEKPGASMKI SCKASGYSFT GYNMNWVKQS NGKSLEWIGS IDPYTGGSNY NQKFMGKATL TVDKSSSTAY MQLKSLTSE DSAVYYCATV VGRVYAMDYW GQGTSVTVSS AKTTPPSVYP LAPGSAAQTN SMVTLGCLVK GYFPEPVTVT W NSGSLSSG VHTFPAVLQS DLYTLSSSVT VPSSTWPSET VTCNVAHPAS STKVDKKIVP

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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

Concentration1 mg/mL
BufferpH: 7.4 / Component - Concentration: 20.0 millimolar / Component - Name: HEPES / Details: 20 mM HEPES, pH 7.4 150 mM NaCl
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K2 BASE (4k x 4k) / Average electron dose: 30.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: OTHER
Electron opticsIllumination mode: OTHER / Imaging mode: OTHER
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.8 Å / Resolution method: FSC 3 SIGMA CUT-OFF / Number images used: 64968
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER

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