4APH | pdb_00004aph

Human angiotensin-converting enzyme in complex with angiotensin-II

PDB DOI: https://doi.org/10.2210/pdb4APH/pdb

Classification: HYDROLASE/HORMONE
Organism(s): Homo sapiens
Expression System: Cricetulus griseus
Mutation(s): No

Deposited: 2012-04-03 Released: 2012-10-17
Deposition Author(s): Masuyer, G., Schwager, S.L.U., Sturrock, E.D., Isaac, R.E., Acharya, K.R.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.99 Å
R-Value Free:
0.240 (Depositor), 0.241 (DCC)
R-Value Work:
0.194 (Depositor), 0.194 (DCC)
R-Value Observed:
0.196 (Depositor)

Starting Model: experimental
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Ligand Structure Quality Assessment

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Literature

Molecular Recognition and Regulation of Human Angiotensin-I Converting Enzyme (Ace) Activity by Natural Inhibitory Peptides.

Masuyer, G., Schwager, S.L.U., Sturrock, E.D., Isaac, R.E., Acharya, K.R.

(2012) Sci Rep 2: 717

PubMed: 23056909 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1038/srep00717
Primary Citation Related Structures:
4APH, 4APJ

PubMed Abstract:
Angiotensin-I converting enzyme (ACE), a two-domain dipeptidylcarboxypeptidase, is a key regulator of blood pressure as a result of its critical role in the renin-angiotensin-aldosterone and kallikrein-kinin systems. Hence it is an important drug target in the treatment of cardiovascular diseases. ACE is primarily known for its ability to cleave angiotensin I (Ang I) to the vasoactive octapeptide angiotensin II (Ang II), but is also able to cleave a number of other substrates including the vasodilator bradykinin and N-acetyl-Ser-Asp-Lys-Pro (Ac-SDKP), a physiological modulator of hematopoiesis. For the first time we provide a detailed biochemical and structural basis for the domain selectivity of the natural peptide inhibitors of ACE, bradykinin potentiating peptide b and Ang II. Moreover, Ang II showed selective competitive inhibition of the carboxy-terminal domain of human somatic ACE providing evidence for a regulatory role in the human renin-angiotensin system (RAS).

Organizational Affiliation

Department of Biology and Biochemistry, University of Bath, Claverton Down, Bath, UK.

Macromolecule Content

Total Structure Weight: 70.71 kDa
Atom Count: 5,319
Modeled Residue Count: 590
Deposited Residue Count: 597
Unique protein chains: 2

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ANGIOTENSIN-CONVERTING ENZYME	A	589	Homo sapiens	Mutation(s): 0 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 GTEx: ENSG00000159640
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P12821
Glycosylation
Glycosylation Sites: 2	Glycosylation Focus chain A	Go to GlyGen: P12821-1
Sequence Annotations Expand
Reference Sequence

Find similar proteins by: Sequence | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
ANGIOTENSIN-2	B [auth P]	8	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P01019 (Homo sapiens) Explore P01019 Go to UniProtKB: P01019
PHAROS: P01019 GTEx: ENSG00000135744
Entity Groups
UniProt Group	P01019
Sequence Annotations Expand
Reference Sequence

Oligosaccharides

Help

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	D Interactions
beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	C [auth B]	3		N-Glycosylation	Interactions Focus chain C [auth B] Interactions & Density Focus chain C [auth B]
Glycosylation Resources
GlyTouCan: G15407YE GlyCosmos: G15407YE GlyGen: G15407YE

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
PE4 Query on PE4 Download:Ideal Coordinates CCD File SDF format, chain G [auth A] MOL2 format, chain G [auth A] mmCIF format, chain G [auth A]	G [auth A]	2-{2-[2-(2-{2-[2-(2-ETHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHOXY]-ETHOXY}-ETHANOL C₁₆ H₃₄ O₈ PJWQOENWHPEPKI-UHFFFAOYSA-N		Interactions Focus chain G [auth A] Interactions & Density Focus chain G [auth A]
NAG Query on NAG Download:Ideal Coordinates CCD File SDF format, chain H [auth A] MOL2 format, chain H [auth A] mmCIF format, chain H [auth A]	H [auth A]	2-acetamido-2-deoxy-beta-D-glucopyranose C₈ H₁₅ N O₆ OVRNDRQMDRJTHS-FMDGEEDCSA-N		Interactions Focus chain H [auth A] Interactions & Density Focus chain H [auth A]
ZN Query on ZN Download:Ideal Coordinates CCD File SDF format, chain E [auth A] MOL2 format, chain E [auth A] mmCIF format, chain E [auth A]	E [auth A]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N		Interactions Focus chain E [auth A] Interactions & Density Focus chain E [auth A]
ACT Query on ACT Download:Ideal Coordinates CCD File SDF format, chain J [auth A] SDF format, chain M [auth A] SDF format, chain L [auth A] SDF format, chain K [auth A] SDF format, chain I [auth A] MOL2 format, chain J [auth A] MOL2 format, chain M [auth A] MOL2 format, chain L [auth A] MOL2 format, chain K [auth A] MOL2 format, chain I [auth A] mmCIF format, chain J [auth A] mmCIF format, chain M [auth A] mmCIF format, chain L [auth A] mmCIF format, chain K [auth A] mmCIF format, chain I [auth A]	I [auth A], J [auth A], K [auth A], L [auth A], M [auth A]	ACETATE ION C₂ H₃ O₂ QTBSBXVTEAMEQO-UHFFFAOYSA-M		Interactions Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A] Focus chain M [auth A] Interactions & Density Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A] Focus chain M [auth A]
CL Query on CL Download:Ideal Coordinates CCD File SDF format, chain D [auth A] SDF format, chain F [auth A] MOL2 format, chain D [auth A] MOL2 format, chain F [auth A] mmCIF format, chain D [auth A] mmCIF format, chain F [auth A]	D [auth A], F [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M		Interactions Focus chain D [auth A] Focus chain F [auth A] Interactions & Density Focus chain D [auth A] Focus chain F [auth A]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.99 Å
R-Value Free: 0.240 (Depositor), 0.241 (DCC)
R-Value Work: 0.194 (Depositor), 0.194 (DCC)
R-Value Observed: 0.196 (Depositor)

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 56.5	α = 90
b = 84.66	β = 90
c = 133.97	γ = 90

Software Package:

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

Structure Validation

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Ligand Structure Quality Assessment

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Entry History

Deposition Data

Released Date: 2012-10-17

Deposition Author(s):

Revision History (Full details and data files)

Version 1.0: 2012-10-17
Type: Initial release
Version 1.1: 2012-10-24
Changes: Database references
Version 1.2: 2017-01-25
Changes: Atomic model, Derived calculations, Non-polymer description, Other
Version 2.0: 2020-07-29
Type: Remediation
Reason: Carbohydrate remediation
Changes: Advisory, Atomic model, Data collection, Derived calculations, Other, Structure summary
Version 2.1: 2023-12-20
Changes: Data collection, Database references, Refinement description, Structure summary
Version 3.0: 2025-10-01
Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary