Identification of critical active-site residues in angiotensin-converting enzyme-2 (ACE2) by site-directed mutagenesis.
Identifieur interne : 004A95 ( Main/Merge ); précédent : 004A94; suivant : 004A96Identification 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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Jackson</name></author><author><name sortKey="Jensen, Hanne A" sort="Jensen, Hanne A" uniqKey="Jensen H" first="Hanne A" last="Jensen">Hanne A. Jensen</name></author><author><name sortKey="Hooper, Nigel M" sort="Hooper, Nigel M" uniqKey="Hooper N" first="Nigel M" last="Hooper">Nigel M. Hooper</name></author><author><name sortKey="Turner, Anthony J" sort="Turner, Anthony J" uniqKey="Turner A" first="Anthony J" last="Turner">Anthony J. 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Guy</name><affiliation wicri:level="4"><nlm:affiliation>School of Biochemistry and Microbiology, University of Leeds, UK. bmbjlg@bmb.leeds.ac.uk</nlm:affiliation><country xml:lang="fr">Royaume-Uni</country><wicri:regionArea>School of Biochemistry and Microbiology, University of Leeds</wicri:regionArea><placeName><settlement type="city">Leeds</settlement><region type="country">Angleterre</region><region type="région" nuts="1">Yorkshire-et-Humber</region></placeName><orgName type="university">Université de Leeds</orgName></affiliation></author><author><name sortKey="Jackson, Richard M" sort="Jackson, Richard M" uniqKey="Jackson R" first="Richard M" last="Jackson">Richard M. Jackson</name></author><author><name sortKey="Jensen, Hanne A" sort="Jensen, Hanne A" uniqKey="Jensen H" first="Hanne A" last="Jensen">Hanne A. Jensen</name></author><author><name sortKey="Hooper, Nigel M" sort="Hooper, Nigel M" uniqKey="Hooper N" first="Nigel M" last="Hooper">Nigel M. Hooper</name></author><author><name sortKey="Turner, Anthony J" sort="Turner, Anthony J" uniqKey="Turner A" first="Anthony J" last="Turner">Anthony J. Turner</name></author></analytic><series><title level="j">The FEBS journal</title><idno type="ISSN">1742-464X</idno><imprint><date when="2005" type="published">2005</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Arginine (genetics)</term><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><term>Male</term><term>Models, Molecular</term><term>Mutagenesis, Site-Directed (genetics)</term><term>Peptidyl-Dipeptidase A</term><term>Protein Structure, Tertiary</term><term>Substrate Specificity</term><term>Testis (enzymology)</term></keywords><keywords scheme="KwdFr" xml:lang="fr"><term>Arginine (génétique)</term><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></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Carboxypeptidases</term></keywords><keywords scheme="MESH" type="chemical" qualifier="genetics" xml:lang="en"><term>Arginine</term><term>Carboxypeptidases</term><term>Histidine</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Arginine</term><term>Carboxypeptidases</term><term>Chlorides</term><term>Histidine</term></keywords><keywords scheme="MESH" qualifier="enzymologie" xml:lang="fr"><term>Testicule</term></keywords><keywords scheme="MESH" qualifier="enzymology" xml:lang="en"><term>Testis</term></keywords><keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Mutagenesis, Site-Directed</term></keywords><keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>Arginine</term><term>Carboxypeptidases</term><term>Histidine</term><term>Mutagenèse dirigée</term></keywords><keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Arginine</term><term>Carboxypeptidases</term><term>Chlorures</term><term>Histidine</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Binding Sites</term><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></keywords><keywords scheme="MESH" xml:lang="fr"><term>Carboxypeptidases</term><term>Catalyse</term><term>Humains</term><term>Lignée cellulaire</term><term>Modèles moléculaires</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></keywords></textClass></profileDesc></teiHeader><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></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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