1Z32

Structure-function relationships in human salivary alpha-amylase: Role of aromatic residues

• PDB DOI: https://doi.org/10.2210/pdb1Z32/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): Yes 


• Deposited: 2005-03-10 Released: 2005-05-31 
• Deposition Author(s): Ramasubbu, N., Ragunath, C., Sundar, K., Mishra, P.J., Gyemant, G., Kandra, L.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.192 
• R-Value Work: 0.171 
• R-Value Observed: 0.172 

Starting Model: experimental

Literature

Structure-function relationships in human salivary alpha-amylase: Role of aromatic residues

Ramasubbu, N., Ragunath, C., Sundar, K., Mishra, P.J., Gyemant, G., Kandra, L.

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: 56.52 kDa 
• Atom Count: 4,315 
• Modelled Residue Count: 496 
• Deposited Residue Count: 496 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Salivary alpha-amylase	A [auth X]	496	Homo sapiens	Mutation(s): 1  Gene Names: AMY1A, AMY1 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 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GLC	B [auth X]	alpha-D-glucopyranose C6 H12 O6 WQZGKKKJIJFFOK-DVKNGEFBSA-N
HMC	D [auth X]	5-HYDROXYMETHYL-CHONDURITOL C7 H12 O5 PJPGMULJEYSZBS-VZFHVOOUSA-N
AGL	C [auth X]	4-amino-4,6-dideoxy-alpha-D-glucopyranose C6 H13 N O4 RJKBJEZZABBYBA-DVKNGEFBSA-N
CA	E [auth X]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
CL	F [auth X]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.192 
• R-Value Work: 0.171 
• R-Value Observed: 0.172 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.657	α = 90
b = 73.513	β = 90
c = 134.362	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2005-05-31 
Deposition Author(s): Ramasubbu, N., Ragunath, C., Sundar, K., Mishra, P.J., Gyemant, G., Kandra, L.

Revision History  

• Version 1.0: 2005-05-31
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-02-14
  Changes: Advisory, Experimental preparation
• Version 2.0: 2019-12-25
  Changes: Data collection, Database references, Derived calculations, Polymer sequence
• Version 2.1: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Data collection, Derived calculations, Structure summary
• Version 2.2: 2021-10-20
  Changes: Database references, Structure summary
• Version 2.3: 2023-08-23
  Changes: Data collection, Refinement description