9IKP | pdb_00009ikp

Crystal structure of human malectin

• PDB DOI: https://doi.org/10.2210/pdb9IKP/pdb

• Classification: SUGAR BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia
• Mutation(s): No 


• Deposited: 2024-06-28 Released: 2025-07-02 
• Deposition Author(s): Si, Y.L.
• Funding Organization(s): National Natural Science Foundation of China (NSFC)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.68 Å
• R-Value Free: 
  0.211 (Depositor), 0.206 (DCC) 
• R-Value Work: 
  0.172 (Depositor), 0.169 (DCC) 
• R-Value Observed: 
  0.173 (Depositor) 

Starting Model: experimental

Literature

The Structural Basis of Human Malectin Recognition of Ligands

Si, Y.L.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Macromolecule Content 

• Total Structure Weight: 41.87 kDa 
• Atom Count: 3,433 
• Modeled Residue Count: 368 
• Deposited Residue Count: 368 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Malectin	A, B	184	Homo sapiens	Mutation(s): 0  Gene Names: MLEC, KIAA0152
UniProt & NIH Common Fund Data Resources
Find proteins for Q14165 (Homo sapiens) Explore Q14165  Go to UniProtKB:  Q14165
PHAROS:  Q14165 GTEx:  ENSG00000110917

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	D [auth A], F [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
DIO (Subject of Investigation/LOI)	C [auth A], E [auth B]	1,4-DIETHYLENE DIOXIDE C4 H8 O2 RYHBNJHYFVUHQT-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.68 Å
• R-Value Free:  0.211 (Depositor), 0.206 (DCC) 
• R-Value Work:  0.172 (Depositor), 0.169 (DCC) 
• R-Value Observed: 0.173 (Depositor) 

Space Group: P 3₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 100.656	α = 90
b = 100.656	β = 90
c = 36.188	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
autoPX	data processing
autoPX	data reduction
PHENIX	phasing

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-07-02 
Deposition Author(s): Si, Y.L.

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Funding Organization	Location	Grant Number
National Natural Science Foundation of China (NSFC)	China	82201916

Revision History  

• Version 1.0: 2025-07-02
  Type: Initial release