<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1870-249X</journal-id>
<journal-title><![CDATA[Journal of the Mexican Chemical Society]]></journal-title>
<abbrev-journal-title><![CDATA[J. Mex. Chem. Soc]]></abbrev-journal-title>
<issn>1870-249X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Química de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-249X2007000300005</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Homology Modeling and Blind Docking Approach Studies of Pig Heart Fumarase]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trujillo-Ferrara]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosales-Hernández]]></surname>
<given-names><![CDATA[Martha Cecilia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Correa-Basurto]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Medicina Departamento de Bioquímica]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Medicina Departamento de Farmacología]]></institution>
<addr-line><![CDATA[México Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<volume>51</volume>
<numero>3</numero>
<fpage>148</fpage>
<lpage>153</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-249X2007000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-249X2007000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-249X2007000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The fumarase is an enzyme that could be used as target in drug design to treat infections by Helicobacter pylori and Trypanosoma brucei. In the first step, homology modeling was employed to build the 3D structure of pig heart fumarase (FUM P). Then, Q-Site Finder program was used to identify the potential binding sites of FUM P and fumarase of Saccharomyces cerevisiae (FUM Y). Further, molecular docking of arylderivatives substituted at the aromatic ring with an electron withdrawing or donating groups were evaluated on FUM P and on FUM Y to validate the homology model. The homology model of FUM P showed a structure very similar (70.33 % of identity in sequence) to the crystal structure of FUM Y. Some active sites were identified by Q-Site Finder server on FUM P and on FUM Y which could correspond to sites A and B. The docking results showed that some compounds were bonded at the site A on FUM P and FUM Y being those with electron withdrawing groups with more affinity on FUM P, suggesting that electronic effects are the more important ones during the recognition process by FUM P.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[La fumarasa es un enzima que podría ser usada como blanco en el diseño de drogas para el tratamiento de infecciones por Helicobacterpylori y Trypanosoma brucei. En este trabajo, se creó la estructura en tercera dimensión (3D) de la fumarasa de corazón de cerdo (FUM P) usando modelado por homología tomando como templete a la fumarasa de Saccharomyces cerevisiae (FUM Y). Después, se usó el programa Q-Site Finder para identificar los posibles sitios de unión de FUM P y FUM Y. Posteriormente, se efectuaron estudios de acoplamiento molecular de un grupo de derivados aril monosustituidos con grupos electrodonadores y electroatractores, sobre la FUM P y la FUM Y, con el fin de validar el modelo por homología. La estructura en 3D de la FUM P mostró alta semejanza estructural (70.33 %) con la estructura cristalina de la FUM Y. Algunos sitios de unión de FUM P identificados con el programa Q-Site Finder corresponden a los sitios A y B de FUM Y. Los resultados de docking mostraron que algunos compuestos interactúan en el sitio A de FUM P FUM Y, siendo los de mayor afinidad aquellos que tienen electroatractores sobre FUM P, lo que sugiere que los efectos electrónicos son los más importantes durante el proceso de reconocimiento para FUM P.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Homology]]></kwd>
<kwd lng="en"><![CDATA[docking]]></kwd>
<kwd lng="en"><![CDATA[arylderivatives]]></kwd>
<kwd lng="en"><![CDATA[pig heart fumarase]]></kwd>
<kwd lng="es"><![CDATA[Homología]]></kwd>
<kwd lng="es"><![CDATA[acoplamiento]]></kwd>
<kwd lng="es"><![CDATA[arilderivados]]></kwd>
<kwd lng="es"><![CDATA[fumarasa de corazón de cerdo]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Article</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Homology Modeling and Blind Docking Approach Studies of Pig Heart Fumarase</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Jos&eacute; Trujillo&#45;Ferrara,<sup>1</sup> Martha Cecilia Rosales&#45;Hern&aacute;ndez,<sup>1</sup> Jos&eacute; Correa&#45;Basurto*<sup>1,2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>1</sup>&nbsp;<i>Secci&oacute;n de Estudios de Posgrado e Investigaci&oacute;n y Departamento de Bioqu&iacute;mica, Escuela Superior de Medicina, Instituto Polit&eacute;cnico Nacional, Plan de San Luis y D&iacute;az Mir&oacute;n, M&eacute;xico, D.F., 11340, M&eacute;xico. Tel/Fax *52 55 7296000 Ext. 62747.</i> <a href="mailto:jcorreab@ipn.mx">jcorreab@ipn.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup>2</sup><i>&nbsp;Departamento de Farmacolog&iacute;a, Escuela Superior de Medicina, Instituto Polit&eacute;cnico Nacional, Plan de San Luis y D&iacute;az Mir&oacute;n, M&eacute;xico, D.F., 11340, M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 21 de marzo de 2007    <br> 	Aceptado el 23 de noviembre de 2007</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The fumarase is an enzyme that could be used as target in drug design to treat infections by <i>Helicobacter pylori</i> and <i>Trypanosoma brucei.</i> In the first step, homology modeling was employed to build the 3D structure of pig heart fumarase (FUM P). Then, Q&#45;Site Finder program was used to identify the potential binding sites of FUM P and fumarase of <i>Saccharomyces cerevisiae</i> (FUM Y). Further, molecular docking of arylderivatives substituted at the aromatic ring with an electron withdrawing or donating groups were evaluated on FUM P and on FUM Y to validate the homology model. The homology model of FUM P showed a structure very similar (70.33 % of identity in sequence) to the crystal structure of FUM Y. Some active sites were identified by Q&#45;Site Finder server on FUM P and on FUM Y which could correspond to sites A and B. The docking results showed that some compounds were bonded at the site A on FUM P and FUM Y being those with electron withdrawing groups with more affinity on FUM P, suggesting that electronic effects are the more important ones during the recognition process by FUM P.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Homology, docking, arylderivatives, pig heart fumarase.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La fumarasa es un enzima que podr&iacute;a ser usada como blanco en el dise&ntilde;o de drogas para el tratamiento de infecciones por <i>Helicobacterpylori</i> y <i>Trypanosoma brucei.</i> En este trabajo, se cre&oacute; la estructura en tercera dimensi&oacute;n (3D) de la fumarasa de coraz&oacute;n de cerdo (FUM P) usando modelado por homolog&iacute;a tomando como templete a la fumarasa de <i>Saccharomyces cerevisiae</i> (FUM Y). Despu&eacute;s, se us&oacute; el programa Q&#45;Site Finder para identificar los posibles sitios de uni&oacute;n de FUM P y FUM Y. Posteriormente, se efectuaron estudios de acoplamiento molecular de un grupo de derivados aril monosustituidos con grupos electrodonadores y electroatractores, sobre la FUM P y la FUM Y, con el fin de validar el modelo por homolog&iacute;a. La estructura en 3D de la FUM P mostr&oacute; alta semejanza estructural (70.33 %) con la estructura cristalina de la FUM Y. Algunos sitios de uni&oacute;n de FUM P identificados con el programa Q&#45;Site Finder corresponden a los sitios A y B de FUM Y. Los resultados de <i>docking</i> mostraron que algunos compuestos interact&uacute;an en el sitio A de FUM P FUM Y, siendo los de mayor afinidad aquellos que tienen electroatractores sobre FUM P, lo que sugiere que los efectos electr&oacute;nicos son los m&aacute;s importantes durante el proceso de reconocimiento para FUM P.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Homolog&iacute;a, acoplamiento, arilderivados, fumarasa de coraz&oacute;n de cerdo.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/jmcs/v51n3/v51n3a5.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Acknowledgements</b></font></p>  	    <p align="justify"><font face="verdana" size="2">The authors thank to CONACYT (62488), COFAA&#45;SIP/IPN (20070140) for financial support.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1.&nbsp;Jato&#45;Rodriguez, J. J.; Hudson, A. J.; Strickland, K. 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