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- PDB-8vae: Cryogenic electron microscopy structure of human serum albumin in... -

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Basic information

Entry
Database: PDB / ID: 8vae
TitleCryogenic electron microscopy structure of human serum albumin in complex with salicylic acid
ComponentsSerum albumin
KeywordsTRANSPORT PROTEIN / Human Serum Albumin / Salicylic acid
Function / homology
Function and homology information


exogenous protein binding / Ciprofloxacin ADME / cellular response to calcium ion starvation / enterobactin binding / Heme biosynthesis / HDL remodeling / negative regulation of mitochondrial depolarization / Prednisone ADME / Heme degradation / Aspirin ADME ...exogenous protein binding / Ciprofloxacin ADME / cellular response to calcium ion starvation / enterobactin binding / Heme biosynthesis / HDL remodeling / negative regulation of mitochondrial depolarization / Prednisone ADME / Heme degradation / Aspirin ADME / antioxidant activity / toxic substance binding / Scavenging of heme from plasma / Recycling of bile acids and salts / cellular response to starvation / platelet alpha granule lumen / fatty acid binding / Post-translational protein phosphorylation / Cytoprotection by HMOX1 / Regulation of Insulin-like Growth Factor (IGF) transport and uptake by Insulin-like Growth Factor Binding Proteins (IGFBPs) / pyridoxal phosphate binding / Platelet degranulation / protein-folding chaperone binding / blood microparticle / copper ion binding / endoplasmic reticulum lumen / Golgi apparatus / endoplasmic reticulum / protein-containing complex / DNA binding / extracellular space / extracellular exosome / extracellular region / identical protein binding / nucleus / cytoplasm
Similarity search - Function
Serum albumin/Alpha-fetoprotein/Afamin / ALB/AFP/VDB / Serum albumin, N-terminal / Serum albumin, conserved site / Serum albumin-like / Serum albumin family / Albumin domain signature. / Albumin domain profile. / serum albumin
Similarity search - Domain/homology
2-HYDROXYBENZOIC ACID / Albumin
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsCatalano, C. / Lucier, K.W. / To, D. / Senko, S. / Tran, N.L. / Farwell, A.C. / Silva, S.M. / Dip, P.V. / Poweleit, N. / Scapin, G.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: J Struct Biol / Year: 2024
Title: The CryoEM structure of human serum albumin in complex with ligands.
Authors: Claudio Catalano / Kyle W Lucier / Dennis To / Skerdi Senko / Nhi L Tran / Ashlyn C Farwell / Sabrina M Silva / Phat V Dip / Nicole Poweleit / Giovanna Scapin /
Abstract: Human serum albumin (HSA) is the most prevalent plasma protein in the human body, accounting for 60 % of the total plasma protein. HSA plays a major pharmacokinetic function, serving as a ...Human serum albumin (HSA) is the most prevalent plasma protein in the human body, accounting for 60 % of the total plasma protein. HSA plays a major pharmacokinetic function, serving as a facilitator in the distribution of endobiotics and xenobiotics within the organism. In this paper we report the cryoEM structures of HSA in the apo form and in complex with two ligands (salicylic acid and teniposide) at a resolution of 3.5, 3.7 and 3.4 Å, respectively. We expand upon previously published work and further demonstrate that sub-4 Å maps of ∼60 kDa proteins can be routinely obtained using a 200 kV microscope, employing standard workflows. Most importantly, these maps allowed for the identification of small molecule ligands, emphasizing the practical applicability of this methodology and providing a starting point for subsequent computational modeling and in silico optimization.
History
DepositionDec 11, 2023Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 26, 2024Provider: repository / Type: Initial release
Revision 1.1Oct 16, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Serum albumin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)66,9864
Polymers66,5711
Non-polymers4143
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Serum albumin


Mass: 66571.219 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human)
Gene: ALB, GIG20, GIG42, PRO0903, PRO1708, PRO2044, PRO2619, PRO2675, UNQ696/PRO1341
Production host: Homo sapiens (human) / References: UniProt: P02768
#2: Chemical ChemComp-SAL / 2-HYDROXYBENZOIC ACID / SALICYLIC ACID


Mass: 138.121 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C7H6O3 / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: human serum albumin in complex with salicyl acid / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
Buffer componentName: PBS
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: UltrAuFoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal magnification: 240000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 3.7 sec. / Electron dose: 36.43 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 9616

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.2particle selection
2Leginon3.6image acquisition
4cryoSPARC4.2CTF correction
7UCSF ChimeraX1.2.5model fitting
9PHENIX1.19.2model refinement
10cryoSPARC4.2initial Euler assignment
11cryoSPARC4.2final Euler assignment
13cryoSPARC4.23D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 530501
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 27064 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingPDB-ID: 1AO6

1ao6


Pdb chain-ID: A / Accession code: 1AO6 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0034743
ELECTRON MICROSCOPYf_angle_d0.6146396
ELECTRON MICROSCOPYf_dihedral_angle_d4.56634
ELECTRON MICROSCOPYf_chiral_restr0.041706
ELECTRON MICROSCOPYf_plane_restr0.003834

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