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  1. Article ; Online: Computational modeling and druggability assessment of Aggregatibacter actinomycetemcomitans leukotoxin.

    Hakmi, Mohammed / Bouricha, El Mehdi / El Harti, Jaouad / Amzazi, Said / Belyamani, Lahcen / Khanfri, Jamal Eddine / Ibrahimi, Azeddine

    Computer methods and programs in biomedicine

    2022  Volume 222, Page(s) 106952

    Abstract: The leukotoxin (LtxA) of Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans) is a protein exotoxin belonging to the repeat-in-toxin family (RTX). Numerous studies have demonstrated that LtxA may play a critical role in the pathogenicity of A. ...

    Abstract The leukotoxin (LtxA) of Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans) is a protein exotoxin belonging to the repeat-in-toxin family (RTX). Numerous studies have demonstrated that LtxA may play a critical role in the pathogenicity of A. actinomycetemcomitans since hyper-leukotoxic strains have been associated with severe disease. Accordingly, considerable effort has been made to elucidate the mechanisms by which LtxA interacts with host cells and induce their death. However, these attempts have been hampered by the unavailability of a tertiary structure of the toxin, which limits the understanding of its molecular properties and mechanisms. In this paper, we used homology and template free modeling algorithms to build the complete tertiary model of LtxA at atomic level in its calcium-bound Holo-state. The resulting model was refined by energy minimization, validated by Molprobity and ProSA tools, and subsequently subjected to a cumulative 600ns of all-atom classical molecular dynamics simulation to evaluate its structural aspects. The druggability of the proposed model was assessed using Fpocket and FTMap tools, resulting in the identification of four putative cavities and fifteen binding hotspots that could be targeted by rational drug design tools to find new ligands to inhibit LtxA activity.
    MeSH term(s) Aggregatibacter actinomycetemcomitans/chemistry ; Aggregatibacter actinomycetemcomitans/metabolism ; Computer Simulation ; Exotoxins/chemistry ; Exotoxins/metabolism ; Exotoxins/pharmacology
    Chemical Substances Exotoxins ; leukotoxin
    Language English
    Publishing date 2022-06-13
    Publishing country Ireland
    Document type Journal Article
    ZDB-ID 632564-6
    ISSN 1872-7565 ; 0169-2607
    ISSN (online) 1872-7565
    ISSN 0169-2607
    DOI 10.1016/j.cmpb.2022.106952
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Spectrochemical study of a new albendazole derivative

    El harti Jaouad / Taoufik Jamal / Ansar M’hammed

    International Journal of Drug Development & Research, Vol 5, Iss 3, Pp 146-

    2013  Volume 149

    Abstract: The hydatidosis is a cosmopolitan parasitic disease that stays a real public health problem in the countries of strong endemic. The treatment essentially calls on the surgery that includes morbidity and mortality significant, from where the interest to ... ...

    Abstract The hydatidosis is a cosmopolitan parasitic disease that stays a real public health problem in the countries of strong endemic. The treatment essentially calls on the surgery that includes morbidity and mortality significant, from where the interest to develop the medical treatment whose main representative is the albendazole. The efficiency of this molecule is proven but limited by its bad biodisponibility due to its weak absorption by the organism. In order to improve the biodisponibility of this molecule we synthesized an ester prodrug of albendazole to solubility completely modified in relation to the princeps. This synthesis has been achieved with an output of 75%. The structure of the synthesis product has been verified and established by spectrometry of infrared molecular absorption, and by spectrometry of nuclear magnetic resonance of the proton.
    Keywords Albendazole ; Synthesis ; Prodrug ; Spectroscopy. ; Pharmacy and materia medica ; RS1-441 ; Medicine ; R
    Subject code 540
    Language English
    Publishing date 2013-09-01T00:00:00Z
    Publisher Chauhan Publishers
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Analyse du risque infectieux autour du patient dans l’unité d’hémodialyse de l’hôpital Ibn Sina de Rabat par application de la méthode d’analyse des modes de défaillance, de leurs effets et de leur criticité.

    El Marnissi, Safaa / Khomsi, Zoubida / Kassy Raymond Sylvestre, Allou / El Harti, Jaouad / Taoufik, Jamal / Chaibi, Aicha / Benamar, Loubna / Bayahia, Rabia

    Nephrologie & therapeutique

    2020  Volume 16, Issue 2, Page(s) 105–117

    Abstract: Introduction: Hemodialysis is a technique of extra-renal purification associated with high level of risk. The objective is to assess infectious risk during a hemodialysis session on hygiene around the patient in hospital.: Methods: An a priori risk ... ...

    Title translation Analysis of the infectious risk around the patient in the hemodialysis unit of Ibn Sina Rabat hospital using the failure modes, effects and criticality analysis method.
    Abstract Introduction: Hemodialysis is a technique of extra-renal purification associated with high level of risk. The objective is to assess infectious risk during a hemodialysis session on hygiene around the patient in hospital.
    Methods: An a priori risk assessment by Failure Modes, Effects and Criticality Analysis method (FMECA) was carried out from May to August 2018, in order to overview infectious risk during the process of hemodialysis in the Ibn Sina Hospital (Rabat, Morocco).
    Results: Twenty eight failure modes were identified during the hemodialysis process around the patient: fourteen criticality level 1, ten level 2, and four level 3. A prevention plan has been drafted. Three of the four level 3 failure modes were reduced to level 1 and one to level 2.
    Discussion: FMECA have enabled us to identify the potential risks, to reconsider certain procedures and to suggest measure matrix for the coverage of the most critical risks.
    Conclusion: This analysis makes it possible, through periodic evaluations, to enter a real quality approach, which reinforces the satisfaction of the patients as well as all the actors of the hemodialysis center.
    MeSH term(s) Cross Infection/epidemiology ; Cross Infection/etiology ; Cross Infection/prevention & control ; Cross-Sectional Studies ; Hemodialysis Units, Hospital ; Hospitals ; Humans ; Kidney Failure, Chronic/therapy ; Morocco ; Renal Dialysis ; Risk Assessment
    Language French
    Publishing date 2020-03-16
    Publishing country France
    Document type Journal Article
    ZDB-ID 2229575-6
    ISSN 1872-9177 ; 1769-7255
    ISSN (online) 1872-9177
    ISSN 1769-7255
    DOI 10.1016/j.nephro.2019.09.005
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: In silico exploration of small-molecule α-helix mimetics as inhibitors of SARS-COV-2 attachment to ACE2.

    Hakmi, Mohammed / Bouricha, E L Mehdi / Akachar, Jihane / Lmimouni, Badreddine / El Harti, Jaouad / Belyamani, Lahcen / Ibrahimi, Azeddine

    Journal of biomolecular structure & dynamics

    2020  Volume 40, Issue 4, Page(s) 1546–1557

    Abstract: The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development ... ...

    Abstract The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development of effective therapies and vaccines as well as accurate diagnosis tools. The pathogenesis of the disease is triggered by the entry of SARS-CoV-2 via its spike protein into ACE2-bearing host cells, particularly pneumocytes, resulting in overactivation of the immune system, which attacks the infected cells and damages the lung tissue. The interaction of the SARS-CoV-2 receptor binding domain (RBD) with host cells is primarily mediated by the N-terminal helix of ACE2; thus, inhibition of the spike-ACE2 interaction may be a promising therapeutic strategy for blocking the virus entry into host cells. In this paper, we used an in-silico approach to explore small-molecule α-helix mimetics as inhibitors that may disrupt the attachment of SARS-CoV-2 to ACE2. First, the RBD-ACE2 interface in the 6M0J structure was studied by the MM-GBSA decomposition module of the HawkDock server, which led to the identification of two critical target regions in the RBD. Next, two virtual screening experiments of 7236 α-helix mimetics from ASINEX were conducted on the above regions using the iDock tool, which resulted in 10 candidates with favorable binding affinities. Finally, the stability of RBD complexes with the top-two ranked compounds was further validated by 100
    MeSH term(s) Angiotensin-Converting Enzyme 2 ; COVID-19 ; Humans ; Molecular Dynamics Simulation ; Protein Binding ; Protein Conformation, alpha-Helical ; SARS-CoV-2/drug effects ; Spike Glycoprotein, Coronavirus/antagonists & inhibitors
    Chemical Substances Spike Glycoprotein, Coronavirus ; spike protein, SARS-CoV-2 ; ACE2 protein, human (EC 3.4.17.23) ; Angiotensin-Converting Enzyme 2 (EC 3.4.17.23)
    Keywords covid19
    Language English
    Publishing date 2020-10-07
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 49157-3
    ISSN 1538-0254 ; 0739-1102
    ISSN (online) 1538-0254
    ISSN 0739-1102
    DOI 10.1080/07391102.2020.1830175
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Targeting the GRP78-Dependant SARS-CoV-2 Cell Entry by Peptides and Small Molecules

    Allam, Loubna Ghrifi Fatima Mohammed Hakmi El Hafidi Naima El Jaoudi Rachid El Harti Jaouad Lmimouni Badreddine Belyamani Lahcen Ibrahimi Azeddine

    Bioinformatics & Biology Insights

    Abstract: The global burden of infections and the rapid spread of viral diseases show the need for new approaches in the prevention and development of effective therapies To this end, we aimed to explore novel inhibitor compounds that can stop replication or ... ...

    Abstract The global burden of infections and the rapid spread of viral diseases show the need for new approaches in the prevention and development of effective therapies To this end, we aimed to explore novel inhibitor compounds that can stop replication or decrease the viral load of the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), for which there is currently no approved treatment Besides using the angiotensin-converting enzyme (ACE2) receptor as a main gate, the CoV-2 can bind to the glucose-regulating protein 78 (GRP78) receptor to get into the cells to start an infection Here, we report potential inhibitors comprising small molecules and peptides that could interfere with the interaction of SARS-CoV-2 and its target cells by blocking the recognition of the GRP78 cellular receptor by the viral Spike protein These inhibitors were discovered through an approach of in silico screening of available databases of bioactive peptides and polyphenolic compounds and the analysis of their docking modes This process led to the selection of 9 compounds with optimal binding affinities to the target sites The peptides (satpdb18674, satpdb18446, satpdb12488, satpdb14438, and satpdb28899) act on regions III and IV of the viral Spike protein and on its binding sites in GRP78 However, 4 polyphenols such as epigallocatechin gallate (EGCG), homoeriodictyol, isorhamnetin, and curcumin interact, in addition to the Spike protein and its binding sites in GRP78, with the ATPase domain of GRP78 Our work demonstrates that there are at least 2 approaches to block the spread of SARS-CoV-2 by preventing its fusion with the host cells via GRP78 [ABSTRACT FROM AUTHOR] Copyright of Bioinformatics & Biology Insights is the property of Sage Publications Inc and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission However, users may print, download, or email articles for individual use This abstract may be abridged No warranty is given about the accuracy of the copy Users should refer to the original published version of the material for the full abstract (Copyright applies to all Abstracts )
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #892352
    Database COVID19

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  6. Article: Targeting the GRP78-Dependant SARS-CoV-2 Cell Entry by Peptides and Small Molecules.

    Allam, Loubna / Ghrifi, Fatima / Mohammed, Hakmi / El Hafidi, Naima / El Jaoudi, Rachid / El Harti, Jaouad / Lmimouni, Badreddine / Belyamani, Lahcen / Ibrahimi, Azeddine

    Bioinformatics and biology insights

    2020  Volume 14, Page(s) 1177932220965505

    Abstract: The global burden of infections and the rapid spread of viral diseases show the need for new approaches in the prevention and development of effective therapies. To this end, we aimed to explore novel inhibitor compounds that can stop replication or ... ...

    Abstract The global burden of infections and the rapid spread of viral diseases show the need for new approaches in the prevention and development of effective therapies. To this end, we aimed to explore novel inhibitor compounds that can stop replication or decrease the viral load of the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), for which there is currently no approved treatment. Besides using the angiotensin-converting enzyme (ACE2) receptor as a main gate, the CoV-2 can bind to the glucose-regulating protein 78 (GRP78) receptor to get into the cells to start an infection. Here, we report potential inhibitors comprising small molecules and peptides that could interfere with the interaction of SARS-CoV-2 and its target cells by blocking the recognition of the GRP78 cellular receptor by the viral Spike protein. These inhibitors were discovered through an approach of in silico screening of available databases of bioactive peptides and polyphenolic compounds and the analysis of their docking modes. This process led to the selection of 9 compounds with optimal binding affinities to the target sites. The peptides (satpdb18674, satpdb18446, satpdb12488, satpdb14438, and satpdb28899) act on regions III and IV of the viral Spike protein and on its binding sites in GRP78. However, 4 polyphenols such as epigallocatechin gallate (EGCG), homoeriodictyol, isorhamnetin, and curcumin interact, in addition to the Spike protein and its binding sites in GRP78, with the ATPase domain of GRP78. Our work demonstrates that there are at least 2 approaches to block the spread of SARS-CoV-2 by preventing its fusion with the host cells via GRP78.
    Keywords covid19
    Language English
    Publishing date 2020-10-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2423808-9
    ISSN 1177-9322
    ISSN 1177-9322
    DOI 10.1177/1177932220965505
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: In silico exploration of small-molecule α-helix mimetics as inhibitors of SARS-COV-2 attachment to ACE2

    Hakmi, Mohammed / Bouricha, E L Mehdi / Akachar, Jihane / Lmimouni, Badreddine / El Harti, Jaouad / Belyamani, Lahcen / Ibrahimi, Azeddine

    J Biomol Struct Dyn

    Abstract: The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development ... ...

    Abstract The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development of effective therapies and vaccines as well as accurate diagnosis tools. The pathogenesis of the disease is triggered by the entry of SARS-CoV-2 via its spike protein into ACE2-bearing host cells, particularly pneumocytes, resulting in overactivation of the immune system, which attacks the infected cells and damages the lung tissue. The interaction of the SARS-CoV-2 receptor binding domain (RBD) with host cells is primarily mediated by the N-terminal helix of ACE2; thus, inhibition of the spike-ACE2 interaction may be a promising therapeutic strategy for blocking the virus entry into host cells. In this paper, we used an in-silico approach to explore small-molecule α-helix mimetics as inhibitors that may disrupt the attachment of SARS-CoV-2 to ACE2. First, the RBD-ACE2 interface in the 6M0J structure was studied by the MM-GBSA decomposition module of the HawkDock server, which led to the identification of two critical target regions in the RBD. Next, two virtual screening experiments of 7236 α-helix mimetics from ASINEX were conducted on the above regions using the iDock tool, which resulted in 10 candidates with favorable binding affinities. Finally, the stability of RBD complexes with the top-two ranked compounds was further validated by 100 ns of molecular dynamics simulations. Communicated by Ramaswamy H. Sarma.
    Keywords covid19
    Publisher WHO
    Document type Article
    Note WHO #Covidence: #842248
    Database COVID19

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  8. Book ; Online: In Silico Exploration of Small-Molecule α-Helix Mimetics as Inhibitors of SARS-COV-2 Attachment to ACE2

    Hakmi, Mohammed / Bouricha, El Mehdi / Akachar, Jihane / Lmimouni, Badreddine / EL Harti, Jaouad / Belyamani, Lahcen / Ibrahimi, Azeddine

    2020  

    Abstract: The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development ... ...

    Abstract The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development of effective therapies and vaccines as well as accurate diagnosis tools. The pathogenesis of the disease is triggered by the entry of SARS-CoV-2 via its spike protein into ACE2-bearing host cells, particularly pneumocytes, resulting in overactivation of the immune system, which attacks the infected cells and damages the lung tissue. The interaction of the SARS-CoV-2 receptor binding domain (RBD) with host cells is primarily mediated by the N-terminal helix of the ACE2; thus, inhibition of the spike-ACE2 interaction may be a promising therapeutic strategy for blocking the entry of the virus into host cells. In this paper, we used an in-silico approach to explore small-molecule α-helix mimetics as inhibitors that may disrupt the attachment of SARS-CoV-2 to ACE2. First, the RBD-ACE2 interface in the 6M0J structure was studied by the MM-GBSA decomposition module of the HawkDock server, which led to the identification of two critical target regions in the RBD. Next, two virtual screening experiments of 7236 α-helix mimetics from ASINEX were conducted on the above regions using the iDock tool, which resulted in 10 candidates with favorable binding affinities. Finally, the stability of RBD complexes with the top-two ranked compounds was further validated by 40 ns MD simulations using Desmond package of Schrodinger.

    Keywords covid19
    Publisher American Chemical Society (ACS)
    Publishing country us
    Document type Book ; Online
    DOI 10.26434/chemrxiv.12592286.v1
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Book ; Online: In Silico Exploration of Small-Molecule α-Helix Mimetics as Inhibitors of SARS-COV-2 Attachment to ACE2

    Hakmi, Mohammed / Bouricha, El Mehdi / Akachar, Jihane / Lmimouni, Badreddine / EL Harti, Jaouad / Belyamani, Lahcen / Ibrahimi, Azeddine

    2020  

    Abstract: The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development ... ...

    Abstract The novel coronavirus, SARS-CoV-2, has infected more than 10 million people and caused more than 502,539 deaths worldwide as of June 2020. The explosive spread of the virus and the rapid increase in the number of cases require the immediate development of effective therapies and vaccines as well as accurate diagnosis tools. The pathogenesis of the disease is triggered by the entry of SARS-CoV-2 via its spike protein into ACE2-bearing host cells, particularly pneumocytes, resulting in overactivation of the immune system, which attacks the infected cells and damages the lung tissue. The interaction of the SARS-CoV-2 receptor binding domain (RBD) with host cells is primarily mediated by the N-terminal helix of the ACE2; thus, inhibition of the spike-ACE2 interaction may be a promising therapeutic strategy for blocking the entry of the virus into host cells. In this paper, we used an in-silico approach to explore small-molecule α-helix mimetics as inhibitors that may disrupt the attachment of SARS-CoV-2 to ACE2. First, the RBD-ACE2 interface in the 6M0J structure was studied by the MM-GBSA decomposition module of the HawkDock server, which led to the identification of two critical target regions in the RBD. Next, two virtual screening experiments of 7236 α-helix mimetics from ASINEX were conducted on the above regions using the iDock tool, which resulted in 10 candidates with favorable binding affinities. Finally, the stability of RBD complexes with the top-two ranked compounds was further validated by 40 ns MD simulations using Desmond package of Schrodinger.

    Keywords covid19
    Publisher American Chemical Society (ACS)
    Publishing country us
    Document type Book ; Online
    DOI 10.26434/chemrxiv.12592286
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Targeting the GRP78-Dependant SARS-CoV-2 Cell Entry by Peptides and Small Molecules

    Allam, Loubna / Ghrifi, Fatima / Mohammed, Hakmi / El Hafidi, Naima / El Jaoudi, Rachid / El Harti, Jaouad / Lmimouni, Badreddine / Belyamani, Lahcen / Ibrahimi, Azeddine

    Bioinformatics and Biology Insights

    2020  Volume 14, Page(s) 117793222096550

    Abstract: The global burden of infections and the rapid spread of viral diseases show the need for new approaches in the prevention and development of effective therapies. To this end, we aimed to explore novel inhibitor compounds that can stop replication or ... ...

    Abstract The global burden of infections and the rapid spread of viral diseases show the need for new approaches in the prevention and development of effective therapies. To this end, we aimed to explore novel inhibitor compounds that can stop replication or decrease the viral load of the novel severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), for which there is currently no approved treatment. Besides using the angiotensin-converting enzyme (ACE2) receptor as a main gate, the CoV-2 can bind to the glucose-regulating protein 78 (GRP78) receptor to get into the cells to start an infection. Here, we report potential inhibitors comprising small molecules and peptides that could interfere with the interaction of SARS-CoV-2 and its target cells by blocking the recognition of the GRP78 cellular receptor by the viral Spike protein. These inhibitors were discovered through an approach of in silico screening of available databases of bioactive peptides and polyphenolic compounds and the analysis of their docking modes. This process led to the selection of 9 compounds with optimal binding affinities to the target sites. The peptides (satpdb18674, satpdb18446, satpdb12488, satpdb14438, and satpdb28899) act on regions III and IV of the viral Spike protein and on its binding sites in GRP78. However, 4 polyphenols such as epigallocatechin gallate (EGCG), homoeriodictyol, isorhamnetin, and curcumin interact, in addition to the Spike protein and its binding sites in GRP78, with the ATPase domain of GRP78. Our work demonstrates that there are at least 2 approaches to block the spread of SARS-CoV-2 by preventing its fusion with the host cells via GRP78.
    Keywords Biochemistry ; Applied Mathematics ; Molecular Biology ; Computational Mathematics ; Computer Science Applications ; covid19
    Language English
    Publisher SAGE Publications
    Publishing country us
    Document type Article ; Online
    ZDB-ID 2423808-9
    ISSN 1177-9322
    ISSN 1177-9322
    DOI 10.1177/1177932220965505
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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