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Open data
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Basic information
Entry | Database: PDB / ID: 7sjn | ||||||
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Title | HtrA1:Fab15H6.v4 complex | ||||||
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![]() | HYDROLASE/Immune System / HtrA1 / allosteric inhibition / Age-related macular degeneration / Geographic Atrophy / Antibody complex / HYDROLASE / HYDROLASE-Immune System complex | ||||||
Function / homology | ![]() chorionic trophoblast cell differentiation / programmed cell death / growth factor binding / negative regulation of BMP signaling pathway / Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases / Degradation of the extracellular matrix / serine-type peptidase activity / molecular function activator activity / negative regulation of transforming growth factor beta receptor signaling pathway / placenta development ...chorionic trophoblast cell differentiation / programmed cell death / growth factor binding / negative regulation of BMP signaling pathway / Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases / Degradation of the extracellular matrix / serine-type peptidase activity / molecular function activator activity / negative regulation of transforming growth factor beta receptor signaling pathway / placenta development / collagen-containing extracellular matrix / positive regulation of apoptotic process / serine-type endopeptidase activity / proteolysis / extracellular space / extracellular exosome / extracellular region / identical protein binding / plasma membrane / cytosol Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å | ||||||
![]() | Gerhardy, S. / Green, E. / Estevez, A. / Arthur, C.P. / Ultsch, M. / Rohou, A. / Kirchhofer, D. | ||||||
Funding support | 1items
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![]() | ![]() Title: Allosteric inhibition of HTRA1 activity by a conformational lock mechanism to treat age-related macular degeneration. Authors: Stefan Gerhardy / Mark Ultsch / Wanjian Tang / Evan Green / Jeffrey K Holden / Wei Li / Alberto Estevez / Chris Arthur / Irene Tom / Alexis Rohou / Daniel Kirchhofer / ![]() Abstract: The trimeric serine protease HTRA1 is a genetic risk factor associated with geographic atrophy (GA), a currently untreatable form of age-related macular degeneration. Here, we describe the allosteric ...The trimeric serine protease HTRA1 is a genetic risk factor associated with geographic atrophy (GA), a currently untreatable form of age-related macular degeneration. Here, we describe the allosteric inhibition mechanism of HTRA1 by a clinical Fab fragment, currently being evaluated for GA treatment. Using cryo-EM, X-ray crystallography and biochemical assays we identify the exposed LoopA of HTRA1 as the sole Fab epitope, which is approximately 30 Å away from the active site. The cryo-EM structure of the HTRA1:Fab complex in combination with molecular dynamics simulations revealed that Fab binding to LoopA locks HTRA1 in a non-competent conformational state, incapable of supporting catalysis. Moreover, grafting the HTRA1-LoopA epitope onto HTRA2 and HTRA3 transferred the allosteric inhibition mechanism. This suggests a conserved conformational lock mechanism across the HTRA family and a critical role of LoopA for catalysis, which was supported by the reduced activity of HTRA1-3 upon LoopA deletion or perturbation. This study reveals the long-range inhibition mechanism of the clinical Fab and identifies an essential function of the exposed LoopA for activity of HTRA family proteases. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 392.5 KB | Display | ![]() |
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PDB format | ![]() | 330.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 25162MC ![]() 7sjmC ![]() 7sjoC ![]() 7sjpC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 22434.699 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() References: UniProt: Q92743, Hydrolases; Acting on peptide bonds (peptidases); Serine endopeptidases #2: Antibody | Mass: 12906.205 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() #3: Antibody | Mass: 11421.634 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: HtrA1PD bound by Fab15H6.v4 at LoopA epitope / Type: COMPLEX Details: HtrA1PD bound by clinical Fab15H6.v4 at LoopA epitope Entity ID: all / Source: RECOMBINANT | ||||||||||||||||||||
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Molecular weight | Value: 0.22 MDa / Experimental value: NO | ||||||||||||||||||||
Source (natural) | Organism: ![]() | ||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | ||||||||||||||||||||
Buffer solution | pH: 7.2 | ||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: HtrA1PD:Fab15H6.v4 complex | ||||||||||||||||||||
Specimen support | Details: SAM: Grids were incubated in 4 mM monothiolalkane(C11)PEG6-OH (11-mercaptoundecyl) hexaethylenglycol (SPT-0011P6, SensoPath Technologies, Inc., Bozeman, MT) for 24h and rinsed in EtOH before sample application Grid material: GOLD / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R0.6/1 | ||||||||||||||||||||
Vitrification | Instrument: LEICA EM GP / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: 3.5s blot time |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 3 sec. / Electron dose: 64 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5345 |
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Processing
Software | Name: PHENIX / Version: 1.19.1-4122_final: / Classification: refinement | ||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
Particle selection | Num. of particles selected: 566088 | ||||||||||||||||||||||||
Symmetry | Point symmetry: C3 (3 fold cyclic) | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 184782 / Symmetry type: POINT | ||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT | ||||||||||||||||||||||||
Atomic model building | PDB-ID: 3TJN Pdb chain-ID: A | ||||||||||||||||||||||||
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