Biological Assembly 1  

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Biological Assembly 3  

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

Biological assembly 3 assigned by authors and generated by PISA (software)

Biological Assembly 4  

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

Biological assembly 4 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 302.59 kDa 
• Atom Count: 22,316 
• Modelled Residue Count: 2,440 
• Deposited Residue Count: 2,544 
• Unique protein chains: 2

 5AM8

Crystal structure of the Angiotensin-1 converting enzyme N-domain in complex with amyloid-beta 4-10

• PDB DOI: 10.2210/pdb5AM8/pdb

• Classification: HYDROLASE
• Organism(s): Homo sapiens
• Expression System: Cricetulus griseus
• Mutation(s): Yes 


• Deposited: 2015-03-10 Released: 2016-01-13 
• Deposition Author(s): Masuyer, G., Larmuth, K.M., Douglas, R.G., Sturrock, E.D., Acharya, K.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.224 
• R-Value Work: 0.185 
• R-Value Observed: 0.187 

Literature

The Kinetic and Structural Characterisation of Amyloid-Beta Metabolism by Human Angiotensin-1- Converting Enzyme (Ace)

Larmuth, K.M., Masuyer, G., Douglas, R.G., Sturrock, E.D., Acharya, K.R.

(2016) FEBS J 283: 1060

• PubMed: 26748546 
• DOI: 10.1111/febs.13647
• Primary Citation of Related Structures:  
  5AM8, 5AM9, 5AMA, 5AMB, 5AMC


• PubMed Abstract: 
  

Angiotensin-1-converting enzyme (ACE), a zinc metallopeptidase, consists of two homologous catalytic domains (N and C) with different substrate specificities. Here we report kinetic parameters of five different forms of human ACE with various amyloid beta (Aβ) substrates together with high resolution crystal structures of the N-domain in complex with Aβ fragments. For the physiological Aβ(1-16) peptide, a novel ACE cleavage site was found at His14-Gln15. Furthermore, Aβ(1-16) was preferentially cleaved by the individual N-domain; however, the presence of an inactive C-domain in full-length somatic ACE (sACE) greatly reduced enzyme activity and affected apparent selectivity. Two fluorogenic substrates, Aβ(4-10)Q and Aβ(4-10)Y, underwent endoproteolytic cleavage at the Asp7-Ser8 bond with all ACE constructs showing greater catalytic efficiency for Aβ(4-10)Y. Surprisingly, in contrast to Aβ(1-16) and Aβ(4-10)Q, sACE showed positive domain cooperativity and the double C-domain (CC-sACE) construct no cooperativity towards Aβ(4-10)Y. The structures of the Aβ peptide-ACE complexes revealed a common mode of peptide binding for both domains which principally targets the C-terminal P2' position to the S2' pocket and recognizes the main chain of the P1' peptide. It is likely that N-domain selectivity for the amyloid peptide is conferred through the N-domain specific S2' residue Thr358. Additionally, the N-domain can accommodate larger substrates through movement of the N-terminal helices, as suggested by the disorder of the hinge region in the crystal structures. Our findings are important for the design of domain selective inhibitors as the differences in domain selectivity are more pronounced with the truncated domains compared to the more physiological full-length forms.

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Organizational Affiliation: 

Department of Integrative Biomedical Sciences, Institute of Infectious Disease and Molecular Medicine, University of Cape Town, South Africa.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ANGIOTENSIN-CONVERTING ENZYME	A, B, C, D	629	Homo sapiens	Mutation(s): 8  Gene Names: ACE, DCP, DCP1 EC: 3.2.1 (PDB Primary Data), 3.4.15.1 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P12821 (Homo sapiens) Explore P12821  Go to UniProtKB:  P12821
PHAROS:  P12821

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
BETA-AMYLOID PROTEIN 42	E [auth P], F [auth Q], G [auth R], H [auth S]	7	Homo sapiens	Mutation(s): 0  Gene Names: APP, A4, AD1
UniProt & NIH Common Fund Data Resources
Find proteins for P05067 (Homo sapiens) Explore P05067  Go to UniProtKB:  P05067
PHAROS:  P05067

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	I [auth E], J [auth F], L [auth H], O [auth K]	2		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT GlyCosmos:  G42666HT GlyGen:  G42666HT

Entity ID: 4
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose	K [auth G], N [auth J]	2		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G86851RC GlyCosmos:  G86851RC GlyGen:  G86851RC

Entity ID: 5
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	M [auth I]	3		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G15407YE GlyCosmos:  G15407YE GlyGen:  G15407YE

Entity ID: 6
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[beta-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose	P [auth L]	4		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G86566TX GlyCosmos:  G86566TX GlyGen:  G86566TX

Entity ID: 7
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose	Q [auth M]	4		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G47477HI GlyCosmos:  G47477HI GlyGen:  G47477HI

Small Molecules

Ligands 6 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
P6G	GA [auth B], WA [auth D], X [auth A]	HEXAETHYLENE GLYCOL C12 H26 O7 IIRDTKBZINWQAW-UHFFFAOYSA-N
NAG	TA [auth D], U [auth A], UA [auth D]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
PEG	AB [auth D], DA [auth B], EA [auth B], FA [auth B], HA [auth B], IA [auth B], MA [auth C], NA [auth C], OA [auth C], PA [auth C], V [auth A], VA [auth D], W [auth A], XA [auth D], Y [auth A], YA [auth D], Z [auth A], ZA [auth D]	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N
SO4	CA [auth B], LA [auth C], SA [auth D], T [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ZN	AA [auth B], JA [auth C], QA [auth D], R [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CL	BA [auth B], KA [auth C], RA [auth D], S [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.224 
• R-Value Work: 0.185 
• R-Value Observed: 0.187 
• Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 73.449	α = 85.23
b = 101.76	β = 86.07
c = 114.361	γ = 81.45

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2016-01-13 
Deposition Author(s): Masuyer, G., Larmuth, K.M., Douglas, R.G., Sturrock, E.D., Acharya, K.R.

Revision History  

• Version 1.0: 2016-01-13
  Type: Initial release
  
• Version 1.1: 2016-01-20
  Changes: Database references
• Version 1.2: 2016-04-06
  Changes: Database references
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary