Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 29.43 kDa 
• Atom Count: 2066 
• Residue Count: 258 
• Unique protein chains: 1

1HLC

X-RAY CRYSTAL STRUCTURE OF THE HUMAN DIMERIC S-LAC LECTIN, L-14-II, IN COMPLEX WITH LACTOSE AT 2.9 ANGSTROMS RESOLUTION

• DOI: 10.2210/pdb1HLC/pdb

• Classification: LECTIN
• Organism(s): Homo sapiens
• Mutation(s): No 


• Deposited: 1993-10-13 Released: 1994-04-30 
• Deposition Author(s): Lobsanov, Y.D., Gitt, M.A., Leffler, H., Barondes, S., Rini, J.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Work: 0.177 
• R-Value Observed: 0.177 

Literature

X-ray crystal structure of the human dimeric S-Lac lectin, L-14-II, in complex with lactose at 2.9-A resolution.

Lobsanov, Y.D., Gitt, M.A., Leffler, H., Barondes, S.H., Rini, J.M.

(1993) J Biol Chem 268: 27034-27038

• PubMed: 8262940 
• DOI: 10.2210/pdb1hlc/pdb
• Primary Citation of Related Structures:  
  1HLC


• PubMed Abstract: 
  

S-Lac lectins are a family of soluble lactose-binding animal lectins, some of which have been implicated in modulating cell-cell and cell-matrix interactions through specific carbohydrate-mediated recognition. We report here the x-ray crystal structure of a representative member of this family, the human dimeric S-Lac lectin, L-14-II, in complex with lactose, at 2.9-A resolution. The two-fold symmetric dimer is made up of two extended anti-parallel beta-sheets, which associate in a beta-sandwich motif. Remarkably, the L-14-II monomer shares not only the same topology, but a very similar beta-sheet structure with that of the leguminous plant lectins, suggesting a conserved structure-function relationship. Carbohydrate binding by L-14-II was found to involve protein residues that are very highly conserved among all S-Lac lectins. These residues map to a single DNA exon, suggesting a carbohydrate binding cassette common to all S-Lac lectins.

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Related Citations: 

• Crystallization and Preliminary X-Ray Diffraction Analysis of the Human Dimeric S-Lac Lectin (L-14-II)
  Lobsanov, Y.D., Gitt, M.A., Leffler, H., Barondes, S., Rini, J.M.
  (1993) J Mol Biol 233: 553

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Organizational Affiliation: 

Department of Molecular and Medical Genetics, University of Toronto, Ontario, Canada.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HUMAN LECTIN	A, B	129	Homo sapiens	Mutation(s): 0  Gene Names: CDNA, LGALS2
Find proteins for P05162 (Homo sapiens) Explore P05162  Go to UniProtKB:  P05162
NIH Common Fund Data Resources
PHAROS:  P05162 GTEx:  ENSG00000100079

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-galactopyranose-(1-4)-beta-D-glucopyranose	C, D	2		N/A

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900004	C, D	beta-lactose	Oligosaccharide /  Nutrient		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Work: 0.177 
• R-Value Observed: 0.177 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 43.6	α = 90
b = 57.8	β = 90
c = 108.2	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1993-10-13 
• Released Date: 1994-04-30 
Deposition Author(s): Lobsanov, Y.D., Gitt, M.A., Leffler, H., Barondes, S., Rini, J.M.

Revision History 

• Version 1.0: 1994-04-30
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary