Identification of critical active-site residues in angiotensin-converting enzyme-2 (ACE2) by site-directed mutagenesis.
Identifieur interne : 004806 ( Main/Curation ); précédent : 004805; suivant : 004807Identification of critical active-site residues in angiotensin-converting enzyme-2 (ACE2) by site-directed mutagenesis.
Auteurs : Jodie L. Guy [Royaume-Uni] ; Richard M. Jackson ; Hanne A. Jensen ; Nigel M. Hooper ; Anthony J. TurnerSource :
- The FEBS journal [ 1742-464X ] ; 2005.
Descripteurs français
- KwdFr :
- Arginine (génétique), Arginine (métabolisme), Carboxypeptidases (), Carboxypeptidases (génétique), Carboxypeptidases (métabolisme), Catalyse, Chlorures (métabolisme), Histidine (génétique), Histidine (métabolisme), Humains, Lignée cellulaire, Modèles moléculaires, Mutagenèse dirigée (génétique), Mâle, Peptidyl-Dipeptidase A, Sites de fixation, Spécificité du substrat, Structure tertiaire des protéines, Testicule (enzymologie).
- MESH :
- enzymologie : Testicule.
- génétique : Arginine, Carboxypeptidases, Histidine, Mutagenèse dirigée.
- métabolisme : Arginine, Carboxypeptidases, Chlorures, Histidine.
- Carboxypeptidases, Catalyse, Humains, Lignée cellulaire, Modèles moléculaires, Mâle, Peptidyl-Dipeptidase A, Sites de fixation, Spécificité du substrat, Structure tertiaire des protéines.
English descriptors
- KwdEn :
- Arginine (genetics), Arginine (metabolism), Binding Sites, Carboxypeptidases (chemistry), Carboxypeptidases (genetics), Carboxypeptidases (metabolism), Catalysis, Cell Line, Chlorides (metabolism), Histidine (genetics), Histidine (metabolism), Humans, Male, Models, Molecular, Mutagenesis, Site-Directed (genetics), Peptidyl-Dipeptidase A, Protein Structure, Tertiary, Substrate Specificity, Testis (enzymology).
- MESH :
- chemical , chemistry : Carboxypeptidases.
- chemical , genetics : Arginine, Carboxypeptidases, Histidine.
- chemical , metabolism : Arginine, Carboxypeptidases, Chlorides, Histidine.
- enzymology : Testis.
- genetics : Mutagenesis, Site-Directed.
- Binding Sites, Catalysis, Cell Line, Humans, Male, Models, Molecular, Peptidyl-Dipeptidase A, Protein Structure, Tertiary, Substrate Specificity.
Abstract
Angiotensin-converting enzyme-2 (ACE2) may play an important role in cardiorenal disease and it has also been implicated as a cellular receptor for the severe acute respiratory syndrome (SARS) virus. The ACE2 active-site model and its crystal structure, which was solved recently, highlighted key differences between ACE2 and its counterpart angiotensin-converting enzyme (ACE), which are responsible for their differing substrate and inhibitor sensitivities. In this study the role of ACE2 active-site residues was explored by site-directed mutagenesis. Arg273 was found to be critical for substrate binding such that its replacement causes enzyme activity to be abolished. Although both His505 and His345 are involved in catalysis, it is His345 and not His505 that acts as the hydrogen bond donor/acceptor in the formation of the tetrahedral peptide intermediate. The difference in chloride sensitivity between ACE2 and ACE was investigated, and the absence of a second chloride-binding site (CL2) in ACE2 confirmed. Thus ACE2 has only one chloride-binding site (CL1) whereas ACE has two sites. This is the first study to address the differences that exist between ACE2 and ACE at the molecular level. The results can be applied to future studies aimed at unravelling the role of ACE2, relative to ACE, in vivo.
DOI: 10.1111/j.1742-4658.2005.04756.x
PubMed: 16008552
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pubmed:16008552Le document en format XML
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<term>Arginine (metabolism)</term>
<term>Binding Sites</term>
<term>Carboxypeptidases (chemistry)</term>
<term>Carboxypeptidases (genetics)</term>
<term>Carboxypeptidases (metabolism)</term>
<term>Catalysis</term>
<term>Cell Line</term>
<term>Chlorides (metabolism)</term>
<term>Histidine (genetics)</term>
<term>Histidine (metabolism)</term>
<term>Humans</term>
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<term>Models, Molecular</term>
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<term>Peptidyl-Dipeptidase A</term>
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<term>Substrate Specificity</term>
<term>Testis (enzymology)</term>
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<term>Arginine (métabolisme)</term>
<term>Carboxypeptidases ()</term>
<term>Carboxypeptidases (génétique)</term>
<term>Carboxypeptidases (métabolisme)</term>
<term>Catalyse</term>
<term>Chlorures (métabolisme)</term>
<term>Histidine (génétique)</term>
<term>Histidine (métabolisme)</term>
<term>Humains</term>
<term>Lignée cellulaire</term>
<term>Modèles moléculaires</term>
<term>Mutagenèse dirigée (génétique)</term>
<term>Mâle</term>
<term>Peptidyl-Dipeptidase A</term>
<term>Sites de fixation</term>
<term>Spécificité du substrat</term>
<term>Structure tertiaire des protéines</term>
<term>Testicule (enzymologie)</term>
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<term>Carboxypeptidases</term>
<term>Chlorides</term>
<term>Histidine</term>
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<keywords scheme="MESH" qualifier="enzymology" xml:lang="en"><term>Testis</term>
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<term>Catalysis</term>
<term>Cell Line</term>
<term>Humans</term>
<term>Male</term>
<term>Models, Molecular</term>
<term>Peptidyl-Dipeptidase A</term>
<term>Protein Structure, Tertiary</term>
<term>Substrate Specificity</term>
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<term>Lignée cellulaire</term>
<term>Modèles moléculaires</term>
<term>Mâle</term>
<term>Peptidyl-Dipeptidase A</term>
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<front><div type="abstract" xml:lang="en">Angiotensin-converting enzyme-2 (ACE2) may play an important role in cardiorenal disease and it has also been implicated as a cellular receptor for the severe acute respiratory syndrome (SARS) virus. The ACE2 active-site model and its crystal structure, which was solved recently, highlighted key differences between ACE2 and its counterpart angiotensin-converting enzyme (ACE), which are responsible for their differing substrate and inhibitor sensitivities. In this study the role of ACE2 active-site residues was explored by site-directed mutagenesis. Arg273 was found to be critical for substrate binding such that its replacement causes enzyme activity to be abolished. Although both His505 and His345 are involved in catalysis, it is His345 and not His505 that acts as the hydrogen bond donor/acceptor in the formation of the tetrahedral peptide intermediate. The difference in chloride sensitivity between ACE2 and ACE was investigated, and the absence of a second chloride-binding site (CL2) in ACE2 confirmed. Thus ACE2 has only one chloride-binding site (CL1) whereas ACE has two sites. This is the first study to address the differences that exist between ACE2 and ACE at the molecular level. The results can be applied to future studies aimed at unravelling the role of ACE2, relative to ACE, in vivo.</div>
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