9HI6 | pdb_00009hi6

Structure of scaffold FI6-focused design_04 in complex with FI6-Fab

• PDB DOI: https://doi.org/10.2210/pdb9HI6/pdb

• Classification: BIOSYNTHETIC PROTEIN
• Organism(s): Homo sapiens, Bacteroides uniformis ATCC 8492
• Expression System: Drosophila melanogaster, Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2024-11-24 Released: 2025-12-03 
• Deposition Author(s): Cramer, J.T., Krey, T.
• Funding Organization(s): German Research Foundation (DFG)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free: 
  0.204 (Depositor), 0.203 (DCC) 
• R-Value Work: 
  0.177 (Depositor), 0.178 (DCC) 
• R-Value Observed: 
  0.179 (Depositor) 

Starting Model: experimental

Literature

Structure of scaffold FI6-focused design_04 in complex with FI6-Fab

Cramer, J.T., Krey, T.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 3-mer - A2B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 74.6 kDa 
• Atom Count: 5,764 
• Modeled Residue Count: 651 
• Deposited Residue Count: 672 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
FI6 Fab Heavy Chain	A [auth H]	235	Homo sapiens	Mutation(s): 0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
FI6-Fab Light Chain	B [auth L]	217	Homo sapiens	Mutation(s): 0

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
FI6-focused design_04	C [auth A]	220	Bacteroides uniformis ATCC 8492	Mutation(s): 0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CIT	D [auth A], E [auth A]	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N
PEG	F [auth A], G [auth A]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.50 Å
• R-Value Free:  0.204 (Depositor), 0.203 (DCC) 
• R-Value Work:  0.177 (Depositor), 0.178 (DCC) 
• R-Value Observed: 0.179 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 71.213	α = 90
b = 47.869	β = 106.13
c = 107.093	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
PHASER	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-12-03 
Deposition Author(s): Cramer, J.T., Krey, T.

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Funding Organization	Location	Grant Number
German Research Foundation (DFG)	Germany	--

Revision History  

• Version 1.0: 2025-12-03
  Type: Initial release