44FI | pdb_000044fi

Undecameric complex of serine proteinase (SDH) with hypothetical protein (HP)

PDB DOI: https://doi.org/10.2210/pdb44FI/pdb
EM Map EMD-82559: EMDB EMDataResource

Classification: IMMUNE SYSTEM
Organism(s): Klebsiella pneumoniae
Expression System: Escherichia coli BL21(DE3)
Mutation(s): No

Deposited: 2026-07-27 Released: 2026-09-16
Deposition Author(s): Yu, Y., Chen, Q.
Funding Organization(s): National Natural Science Foundation of China (NSFC)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.51 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

Validation slider image for 44FI

This is version 1.0 of the entry. See complete history.

Literature

Passive abortive infection mechanisms targeting phage long tail fiber proteins

Yu, Y., Chen, Q.

To be published.

Macromolecule Content

Total Structure Weight: 377.98 kDa
Atom Count: 25,582
Modeled Residue Count: 3,275
Deposited Residue Count: 3,407
Unique protein chains: 6

Macromolecules

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Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
serine proteinase(SDH)	A [auth E] B [auth A] C [auth B] D [auth C] E [auth D] A [auth E], B [auth A], C [auth B], D [auth C], E [auth D], F, G, H, I, J, K	304	Klebsiella pneumoniae	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
Sequence Annotations Expand
Reference Sequence

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Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
hypothetical protein	L [auth O], O [auth P]	7	Klebsiella pneumoniae	Mutation(s): 0
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Reference Sequence

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Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
hypothetical protein	M	10	Klebsiella pneumoniae	Mutation(s): 0
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Reference Sequence

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Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
hypothetical protein	N [auth L]	19	Klebsiella pneumoniae	Mutation(s): 0
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Reference Sequence

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Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
hypothetical protein	P [auth N]	9	Klebsiella pneumoniae	Mutation(s): 0
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Reference Sequence

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Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
hypothetical protein	Q	11	Klebsiella pneumoniae	Mutation(s): 0
Sequence Annotations Expand
Reference Sequence

Small Molecules

Modified Residues 1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
UNK Query on UNK	L [auth O], O [auth P]	L-PEPTIDE LINKING	C₄ H₉ N O₂		--

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.51 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.15.2_3472
RECONSTRUCTION	cryoSPARC

Structure Validation

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Entry History

& Funding Information

Deposition Data

Released Date: 2026-09-16

Deposition Author(s):

Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	--

Revision History (Full details and data files)

Version 1.0: 2026-09-16
Type: Initial release

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.