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- PDB-7v1z: human Serine beta-lactamase-like protein LACTB -

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Entry
Database: PDB / ID: 7v1z
Titlehuman Serine beta-lactamase-like protein LACTB
ComponentsSerine beta-lactamase-like protein LACTB, mitochondrial
KeywordsHYDROLASE / mitochondrial intermembrane space protease / CYTOSOLIC PROTEIN
Function / homology
Function and homology information


Hydrolases; Acting on peptide bonds (peptidases) / regulation of lipid metabolic process / lipid metabolic process / peptidase activity / mitochondrion / proteolysis / identical protein binding / cytosol
Similarity search - Function
: / Beta-lactamase-related / Beta-lactamase / Beta-lactamase/transpeptidase-like
Similarity search - Domain/homology
Serine beta-lactamase-like protein LACTB, mitochondrial
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.98 Å
AuthorsZhang, M.H. / Yang, M.J.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31671049 China
CitationJournal: Structure / Year: 2022
Title: Structural basis for the catalytic activity of filamentous human serine beta-lactamase-like protein LACTB.
Authors: Minghui Zhang / Laixing Zhang / Runyu Guo / Chun Xiao / Jian Yin / Sensen Zhang / Maojun Yang /
Abstract: Serine beta-lactamase-like protein (LACTB) is a mammalian mitochondrial serine protease that can specifically hydrolyze peptide bonds adjacent to aspartic acid residues and is structurally related to ...Serine beta-lactamase-like protein (LACTB) is a mammalian mitochondrial serine protease that can specifically hydrolyze peptide bonds adjacent to aspartic acid residues and is structurally related to prokaryotic penicillin-binding proteins. Here, we determined the cryoelectron microscopy structures of human LACTB (hLACTB) filaments from wild-type protein, a middle region deletion mutant, and in complex with the inhibitor Z-AAD-CMK at 3.0-, 3.1-, and 2.8-Å resolution, respectively. Structural analysis and activity assays revealed that three interfaces are required for the assembly of hLACTB filaments and that the formation of higher order helical structures facilitates its cleavage activity. Further structural and enzymatic analyses of middle region deletion constructs indicated that, while this region is necessary for substrate hydrolysis, it is not required for filament formation. Moreover, the inhibitor-bound structure showed that hLACTB may cleave peptide bonds adjacent to aspartic acid residues. These findings provide the structural basis underlying hLACTB catalytic activity.
History
DepositionAug 7, 2021Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Feb 16, 2022Provider: repository / Type: Initial release
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Revision 1.0Feb 16, 2022Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Feb 16, 2022Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
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Revision 1.1Mar 1, 2023Group: Database references / Category: citation / citation_author
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Revision 1.2Jun 12, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond
Revision 1.3Jul 2, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jul 2, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Assembly

Deposited unit
A: Serine beta-lactamase-like protein LACTB, mitochondrial
B: Serine beta-lactamase-like protein LACTB, mitochondrial
C: Serine beta-lactamase-like protein LACTB, mitochondrial
D: Serine beta-lactamase-like protein LACTB, mitochondrial


Theoretical massNumber of molelcules
Total (without water)219,5584
Polymers219,5584
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: equilibrium centrifugation
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Serine beta-lactamase-like protein LACTB, mitochondrial


Mass: 54889.445 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: LACTB, MRPL56, UNQ843/PRO1781 / Production host: Escherichia coli (E. coli)
References: UniProt: P83111, Hydrolases; Acting on peptide bonds (peptidases)
Has protein modificationN

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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: mitochondrial intermembrane space protease / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.98 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 161602 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00212868
ELECTRON MICROSCOPYf_angle_d0.47417396
ELECTRON MICROSCOPYf_dihedral_angle_d3.8741740
ELECTRON MICROSCOPYf_chiral_restr0.0411908
ELECTRON MICROSCOPYf_plane_restr0.0032208

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