1C8Q

STRUCTURE SOLUTION AND REFINEMENT OF THE RECOMBINANT HUMAN SALIVARY AMYLASE

• PDB DOI: https://doi.org/10.2210/pdb1C8Q/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2000-06-08 Released: 2001-06-13 
• Deposition Author(s): Ramasubbu, N., Sekar, K., Velmurugan, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.216 
• R-Value Work: 0.173 

Starting Model: experimental

Literature

Structure solution and refinment of recombinant human salivary amylase

Ramasubbu, N., Sekar, K., Velmurugan, D.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 56.03 kDa 
• Atom Count: 4,215 
• Modelled Residue Count: 496 
• Deposited Residue Count: 496 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALPHA-AMYLASE	A	496	Homo sapiens	Mutation(s): 0  EC: 3.2.1.1
UniProt & NIH Common Fund Data Resources
Find proteins for P0DUB6 (Homo sapiens) Explore P0DUB6  Go to UniProtKB:  P0DUB6
GTEx:  ENSG00000237763

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	B [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL	C [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PCA	A	L-PEPTIDE LINKING	C5 H7 N O3		GLN

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.216 
• R-Value Work: 0.173 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 52.707	α = 90
b = 74.768	β = 90
c = 133.337	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-06-13 
Deposition Author(s): Ramasubbu, N., Sekar, K., Velmurugan, D.

Revision History  

• Version 1.0: 2001-06-13
  Type: Initial release
  
• Version 1.1: 2008-04-26
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-04
  Changes: Refinement description
• Version 2.0: 2019-12-25
  Changes: Database references, Derived calculations, Polymer sequence
• Version 2.1: 2023-08-09
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 2.2: 2024-10-09
  Changes: Structure summary