Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 54933.71 
• Atom Count: 3854 
• Residue Count: 503 
• Unique protein chains: 2

1CLV

YELLOW MEAL WORM ALPHA-AMYLASE IN COMPLEX WITH THE AMARANTH ALPHA-AMYLASE INHIBITOR

• DOI: 10.2210/pdb1CLV/pdb

• Classification: HYDROLASE
• Organism(s): Tenebrio molitor, Amaranthus hypochondriacus


• Deposited: 1999-05-04 Released: 2000-05-03 
• Deposition Author(s): Pereira, P.J.B., Lozanov, V., Patthy, A., Huber, R., Bode, W., Pongor, S., Strobl, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.190 
• R-Value Work: 0.161 

Literature

Specific inhibition of insect alpha-amylases: yellow meal worm alpha-amylase in complex with the amaranth alpha-amylase inhibitor at 2.0 A resolution.

Pereira, P.J., Lozanov, V., Patthy, A., Huber, R., Bode, W., Pongor, S., Strobl, S.

(1999) Structure Fold.Des. 7: 1079-1088

• PubMed: 10508777 
• Also Cited By: 4BFH


• PubMed Abstract: 
  

alpha-Amylases constitute a family of enzymes that catalyze the hydrolysis of alpha-D-(1,4)-glucan linkages in starch and related polysaccharides. The Amaranth alpha-amylase inhibitor (AAI) specifically inhibits alpha-amylases from insects, but not from mammalian sources. AAI is the smallest proteinaceous alpha-amylase inhibitor described so far and has no known homologs in the sequence databases. Its mode of inhibition of alpha-amylases was unknown until now.

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Organizational Affiliation: 

Max-Planck-Institut für Biochemie Am Klopferspitz 18a, 82152, Planegg, Germany.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (ALPHA-AMYLASE)	A	471	Tenebrio molitor	Mutation(s): 0  EC: 3.2.1.1
Find proteins for P56634 (Tenebrio molitor) Go to UniProtKB:  P56634

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (ALPHA-AMYLASE INHIBITOR)	I	32	Amaranthus hypochondriacus	Mutation(s): 0  Gene Names: AAI
Find proteins for P80403 (Amaranthus hypochondriacus) Go to UniProtKB:  P80403

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

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

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
AAI	Kd: 1 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.190 
• R-Value Work: 0.161 
• Space Group: P 6₁

Unit Cell:

Length (Å)	Angle (°)
a = 119.250	α = 90.00
b = 119.250	β = 90.00
c = 64.780	γ = 120.00

Software Package:

Software Name	Purpose
AMoRE	phasing
SCALEPACK	data scaling
DENZO	data reduction
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-05-04 
• Released Date: 2000-05-03 
• Deposition Author(s): Pereira, P.J.B., Lozanov, V., Patthy, A., Huber, R., Bode, W., Pongor, S., Strobl, S.

Revision History 

• Version 1.0: 2000-05-03
  Type: Initial release
• Version 1.1: 2007-10-16
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance
• Version 2.0: 2019-12-25
  Type: Advisory, Database references, Derived calculations, Polymer sequence