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The Unusual Active Site of Gal6/Bleomycin Hydrolase Can Act as a Carboxypeptidase, Aminopeptidase, and Peptide Ligase

Identifieur interne : 003B16 ( Main/Exploration ); précédent : 003B15; suivant : 003B17

The Unusual Active Site of Gal6/Bleomycin Hydrolase Can Act as a Carboxypeptidase, Aminopeptidase, and Peptide Ligase

Auteurs : Wenjin Zheng [États-Unis] ; Stephen Albert Johnston [États-Unis] ; Leemor Joshua-Tor [États-Unis]

Source :

RBID : ISTEX:FB9D51A6E87039034741F73FC940D84C74E5FE2F

English descriptors

Abstract

Abstract: The Gal6 protease is in a class of cysteine peptidases identified by their ability to inactivate the anti-cancer drug bleomycin. The protein forms a barrel structure with the active sites embedded in a channel as in the proteasome. In Gal6 the C termini lie in the active site clefts. We show that Gal6 acts as a carboxypeptidase on its C terminus to convert itself to an aminopeptidase and peptide ligase. The substrate specificity of the peptidase activity is determined by the position of the C terminus of Gal6 rather than the sequence of the substrate. We propose a model to explain these diverse activities and Gal6's singular ability to inactivate bleomycin.

Url:
DOI: 10.1016/S0092-8674(00)81150-2


Affiliations:


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Le document en format XML

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<term>Active site cysteine</term>
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<term>Drop vapor diffusion method</term>
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<term>Electron density maps</term>
<term>Electrospray mass spectrometry</term>
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<term>Endopeptidase activity</term>
<term>Equal amounts</term>
<term>Gal6</term>
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<term>National synchrotron light source</term>
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<div type="abstract" xml:lang="en">Abstract: The Gal6 protease is in a class of cysteine peptidases identified by their ability to inactivate the anti-cancer drug bleomycin. The protein forms a barrel structure with the active sites embedded in a channel as in the proteasome. In Gal6 the C termini lie in the active site clefts. We show that Gal6 acts as a carboxypeptidase on its C terminus to convert itself to an aminopeptidase and peptide ligase. The substrate specificity of the peptidase activity is determined by the position of the C terminus of Gal6 rather than the sequence of the substrate. We propose a model to explain these diverse activities and Gal6's singular ability to inactivate bleomycin.</div>
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