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                <forename type="first">Fabienne</forename>
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            <idno type="halRefHtml">&lt;i&gt;Bioconjugate Chemistry&lt;/i&gt;, 2002, 13 (4), pp.766-772. &lt;a target="_blank" href="https://dx.doi.org/10.1021/bc015588t"&gt;&amp;#x27E8;10.1021/bc015588t&amp;#x27E9;&lt;/a&gt;</idno>
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                <title xml:lang="en">Identification of two tamoxifen target proteins by photolabeling with 4-(2-morpholinoethoxy)benzophenone.</title>
                <author role="aut">
                  <persName>
                    <forename type="first">Fabienne</forename>
                    <surname>Mésange</surname>
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                    <forename type="first">Mohamed</forename>
                    <surname>Sebbar</surname>
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                  <persName>
                    <forename type="first">Joël</forename>
                    <surname>Capdevielle</surname>
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                  <idno type="halauthorid">160053-0</idno>
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                  <persName>
                    <forename type="first">Jean-Claude</forename>
                    <surname>Guillemot</surname>
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                  <idno type="halauthorid">160054-0</idno>
                  <affiliation ref="#struct-18868"/>
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                  <persName>
                    <forename type="first">Pascual</forename>
                    <surname>Ferrara</surname>
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                    <surname>Bayard</surname>
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                  <idno type="halauthorid">160056-0</idno>
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                  <persName>
                    <forename type="first">Marc</forename>
                    <forename type="middle">E.</forename>
                    <surname>Poirot</surname>
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                  <persName>
                    <forename type="first">Jean-Charles</forename>
                    <surname>Faye</surname>
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                <idno type="halJournalId" status="VALID">11133</idno>
                <idno type="issn">1043-1802</idno>
                <idno type="eissn">1520-4812</idno>
                <title level="j">Bioconjugate Chemistry</title>
                <imprint>
                  <publisher>American Chemical Society</publisher>
                  <biblScope unit="volume">13</biblScope>
                  <biblScope unit="issue">4</biblScope>
                  <biblScope unit="pp">766-772</biblScope>
                  <date type="datePub">2002</date>
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              <classCode scheme="mesh">Animals</classCode>
              <classCode scheme="mesh">Benzophenones</classCode>
              <classCode scheme="mesh">Fatty Acid-Binding Proteins</classCode>
              <classCode scheme="mesh">Hepatocytes</classCode>
              <classCode scheme="mesh">Humans</classCode>
              <classCode scheme="mesh">Morp</classCode>
              <classCode scheme="mesh">Binding Sites</classCode>
              <classCode scheme="mesh">Carboxylesterase</classCode>
              <classCode scheme="mesh">Carboxylic Ester Hydrolases</classCode>
              <classCode scheme="mesh">Carrier Proteins</classCode>
              <classCode scheme="mesh">Cross-Linking Reagents</classCode>
              <classCode scheme="mesh">Drug Delivery Systems</classCode>
              <classCode scheme="mesh">Epoxide Hydrolases</classCode>
              <classCode scheme="mesh">Estrogen Receptor Modulators</classCode>
              <classCode scheme="halDomain" n="sdv.sp">Life Sciences [q-bio]/Pharmaceutical sciences</classCode>
              <classCode scheme="halTypology" n="ART">Journal articles</classCode>
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              <p>Our quest to identify target proteins involved in the activity of tamoxifen led to the design of photoaffinity ligand analogues of tamoxifen able to cross-link such proteins. A new tritiated photoprobe, 4-(2-morpholinoethoxy)benzophenone (MBoPE), was synthesized and used to identify proteins involved in tamoxifen binding in rat liver. MBoPE, which has structural features in common with the potential antagonist of the intracellular histamine receptor (N,N-diethyl-2-[(4-phenylmethyl)phenoxy]ethanamine HCl: DPPE) is unable to bind the estrogen receptor although it does compete with tamoxifen for an antiestrogen binding site (AEBS). This tritiated benzophenone derivative was obtained by metal-catalyzed halogen-tritium replacement reaction. Because of its high specific activity, four target proteins could be photolabeled, three of which were identified with M(r) of 60,000, 49,500, and 14,000, while the fourth at 27,500 was in too low an amount and could not be sequenced. The 49.5 kDa protein corresponded by mass spectrometry to the microsomal epoxide hydrolase already identified with an aryl azide photoprobe [Mesange, F., et al. (1998) Biochem. J. 334, 107-112]. The 60 and 14 kDa proteins were identified as the carboxylesterase (ES10) and the liver fatty acid binding protein (L-FABP), respectively. The inhibitory effect of tamoxifen on carboxylesterase activity and the competitive efficacy of oleic acid on [(3)H]tamoxifen binding suggest that both proteins are AEBS subunits. Moreover, treatment of hepatocytes with antisense mRNA directed against ES10 or L-FABP abolished both tamoxifen and MBoPE binding. On the basis of previous pharmacological arguments, the 27.5 kDa protein might correspond to the sigma I receptor. Altogether, these results confirm that the microsomal epoxide hydrolase is a target for tamoxifen and provide evidence of two new target proteins implicated in cell lipid metabolism.</p>
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