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    Wyświetlanie 1-7 z 7
    Tytuł:
    Identification of proteins associated with Mycobacterium tuberculosis virulence pathway by their polar profile
    Autorzy:
    Polanco, Carlos
    Castañón-González, Jorge
    Mancilla, Raul
    Buhse, Thomas
    Samaniego, José
    Gimbel, Arturo
    Powiązania:
    https://bibliotekanauki.pl/articles/1039087.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Mycobacterium tuberculosis bacteria virulence pathway
    Polarity Index Method
    Opis:
    With almost one third of the world population infected, tuberculosis is one of the most devastating diseases worldwide and it is a major threat to any healthcare system. With the mathematical-computational method named "Polarity Index Method", already published by this group, we identified, with high accuracy (70%), proteins related to Mycobacterium tuberculosis bacteria virulence pathway from the Tuberculist Database. The test considered the totality of proteins cataloged in the main domains: fungi, bacteria, and viruses from three databases: Antimicrobial Peptide Database (APD2), Tuberculist Database, Uniprot Database, and four antigens of Mycobacterium tuberculosis: PstS-1, 38-kDa, 19-kDa, and H37Rv ORF. The method described was calibrated with each database to achieve the same performance, showing a high percentage of coincidence in the identification of proteins associated with Mycobacterium tuberculosis bacteria virulence pathway located in the Tuberculist Database, and identifying a polar pattern regardless of the group studied. This method has already been used in the identification of diverse groups of proteins and peptides, showing that it is an effective discriminant. Its metric considers only one physico-chemical property, i.e. polarity.
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 2; 191-196
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of a possible uptake mechanism of selective antibacterial peptides
    Autorzy:
    Polanco, Carlos
    Samaniego, José
    Castañón-González, Jorge
    Buhse, Thomas
    Sordo, Marili
    Powiązania:
    https://bibliotekanauki.pl/articles/1039457.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Polarity index method
    cell penetrating peptides
    selective antibacterial peptides
    Opis:
    Selective antibacterial peptides containing less than 30 amino acid residues, cationic, with amphipathic properties, have been the subject of several studies due to their active participation and beneficial effects in strengthening the immune system of all living organisms. This manuscript reports the results of a comparison between the group of selective antibacterial peptides and another group called "cell penetrating peptides". An important number of the selective antibacterial peptides are cell penetrating peptides, suggesting that their toxicity is related to their uptake mechanism. The verification of this observation also includes the adaptation of a method previously published, called Polarity index, which reproduces and confirms the action of this new set of peptides. The efficiency of this method was verified based on four different databases, yielding a high score. The verification was based exclusively on the peptides already reported in the databases which have been experimentally verified.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 4; 629-633
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of selective antibacterial peptides by the Polarity Profile method
    Autorzy:
    Polanco, Carlos
    Buhse, Thomas
    Samaniego, José
    Castañón-González, Jorge
    Powiązania:
    https://bibliotekanauki.pl/articles/1039571.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    selective cationic amphipathic antibacterial peptides
    Polarity Profile method
    Polarity Index method
    Opis:
    Antimicrobial peptides occupy a prominent place in the production of pharmaceuticals, because of their effective contribution to the protection of the immune system against almost all types of pathogens. These peptides are thoroughly studied by computational methods designed to shed light on their main functions. In this paper, we propose a computational approach, named the Polarity Profile method that represents an improvement to the former Polarity Index method. The Polarity Profile method is very effective in detecting the subgroup of antibacterial peptides called selective cationic amphipathic antibacterial peptides (SCAAP) that show high toxicity towards bacterial membranes and exhibit almost zero toxicity towards mammalian cells. Our study was restricted to the peptides listed in the antimicrobial peptides database (APD2) of December 19, 2012. Performance of the Polarity Profile method is demonstrated through a comparison to the former Polarity Index method by using the same sets of peptides. The efficiency of the Polarity Profile method exceeds 85% taking into account the false positive and/or false negative peptides.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 2; 183-189
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electronegativity and intrinsic disorder of preeclampsia-related proteins
    Autorzy:
    Polanco, Carlos
    Castañón-González, Jorge
    Uversky, Vladimir
    Buhse, Thomas
    Samaniego Mendoza, José
    Calva, Juan
    Powiązania:
    https://bibliotekanauki.pl/articles/1038693.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    preeclampsia
    intrinsically disordered proteins
    structural proteomics
    bioinformatics
    antimicrobial peptides
    polarity index method
    lipoproteins
    angiogenesis proteins
    Opis:
    Preeclampsia, hemorrhage, and infection are the leading causes of maternal death in underdeveloped countries. Since several proteins associated with preeclampsia are known, we conducted a computational study which evaluated the commonness and potential functionality of intrinsic disorder of these proteins and also made an attempt to characterize their origin. The origin of the preeclampsia-related proteins was assessed with a supervised technique, a Polarity Index Method (PIM), which evaluates the electronegativity of proteins based solely on their sequence. The commonness of intrinsic disorder was evaluated using several disorder predictors from the PONDR family, the charge-hydropathy plot (CH-plot) and cumulative distribution function (CDF) analyses, and using the MobiDB web-based tool, whereas potential functionality of intrinsic disorder was studied with the D2P2 resource and ANCHOR predictor of disorder-based binding sites, and the STRING tool was used to build the interactivity networks of the preeclampsia-related proteins. Peculiarities of the PIM-derived polar profile of the group of preeclampsia-related proteins were then compared with profiles of a group of lipoproteins, antimicrobial peptides, angiogenesis-related proteins, and the intrinsically disordered proteins. Our results showed a high graphical correlation between preeclampsia proteins, lipoproteins, and the angiogenesis proteins. We also showed that many preeclampsia-related proteins contain numerous functional disordered regions. Therefore, these bioinformatics results led us to assume that the preeclampsia proteins are highly associated with the lipoproteins group, and that some preeclampsia-related proteins contain significant amounts of functional disorders.
    Źródło:
    Acta Biochimica Polonica; 2017, 64, 1; 99-111
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Possible computational filter to detect proteins associated to influenza A subtype H1N1
    Autorzy:
    Polanco, Carlos
    Buhse, Thomas
    Castañón-González, Jorge
    Samaniego, José
    Powiązania:
    https://bibliotekanauki.pl/articles/1039197.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Polarity Index Method
    influenza A virus subtype H1N1
    drug design
    QSAR method
    Opis:
    The design of drugs with bioinformatics methods to identify proteins and peptides with a specific toxic action is increasingly recurrent. Here, we identify toxic proteins towards the influenza A virus subtype H1N1 located at the UniProt database. Our quantitative structure-activity relationship (QSAR) approach is based on the analysis of the linear peptide sequence with the so-called Polarity Index Method that shows an efficiency of 90% for proteins from the Uniprot Database. This method was exhaustively verified with the APD2, CPPsite, Uniprot, and AmyPDB databases as well as with the set of antibacterial peptides studied by del Rio et al. and Oldfield et al.
    Źródło:
    Acta Biochimica Polonica; 2014, 61, 4; 693-698
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of proteins associated with amyloidosis by polarity index method
    Autorzy:
    Polanco, Carlos
    Samaniego, José
    Uversky, Vladimir
    Castañón-González, Jorge
    Buhse, Thomas
    Leopold-Sordo, Marili
    Madero-Arteaga, Alejandro
    Morales-Reyes, Alicia
    Tavera-Sierra, Lourdes
    González-Bernal, Jesus
    Arias-Estrada, Miguel
    Powiązania:
    https://bibliotekanauki.pl/articles/1039130.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Polarity index method
    natively unfolded proteins
    intrinsically disordered proteins
    natively folded proteins
    neurons
    amyloidosis
    amyloid
    amyloidogenic protein
    Opis:
    There is a natural protein form, insoluble and resistant to proteolysis, adopted by many proteins independently of their amino acid sequences via specific misfolding-aggregation process. This dynamic process occurs in parallel with or as an alternative to physiologic folding, generating toxic protein aggregates that are deposited and accumulated in various organs and tissues. These proteinaceous deposits typically represent bundles of β-sheet-enriched fibrillar species known as the amyloid fibrils that are responsible for serious pathological conditions, including but not limited to neurodegenerative diseases, grouped under the term amyloidoses. The proteins that might adopt this fibrillar conformation are some globular proteins and natively unfolded (or intrinsically disordered) proteins. Our work shows that intrinsically disordered and intrinsically ordered proteins can be reliably identified, discriminated, and differentiated by analyzing their polarity profiles generated using a computational tool known as the polarity index method (Polanco & Samaniego, 2009; Polanco et al., 2012; 2013; 2013a; 2014; 2014a; 2014b; 2014c; 2014d). We also show that proteins expressed in neurons can be differentiated from proteins in these two groups based on their polarity profiles, and also that this computational tool can be used to identify proteins associated with amyloidoses. The efficiency of the proposed method is high (i.e. 70%) as evidenced by the analysis of peptides and proteins in the APD2 database (2012), AVPpred database (2013), and CPPsite database (2013), the set of selective antibacterial peptides from del Rio et al. (2001), the sets of natively unfolded and natively folded proteins from Oldfield et al. (2005), the set of human revised proteins expressed in neurons, and non-human revised proteins expressed in neurons, from the Uniprot database (2014), and also the set of amyloidogenic proteins from the AmyPDB database (2014).
    Źródło:
    Acta Biochimica Polonica; 2015, 62, 1; 41-55
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Classifying lipoproteins based on their polar profiles
    Autorzy:
    Polanco, Carlos
    Castañón-González, Jorge
    Buhse, Thomas
    Uversky, Vladimir
    Amkie, Rafael
    Powiązania:
    https://bibliotekanauki.pl/articles/1038801.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    potential of association
    lipoproteins
    polar balance
    polarity index method
    unfolded proteins
    folded proteins
    partially folded proteins
    intrinsically disordered proteins
    atherosclerosis
    Opis:
    The lipoproteins are an important group of cargo proteins known for their unique capability to transport lipids. By applying the Polarity index algorithm, which has a metric that only considers the polar profile of the linear sequences of the lipoprotein group, we obtained an analytical and structural differentiation of all the lipoproteins found in UniProt Database. Also, the functional groups of lipoproteins, and particularly of the set of lipoproteins relevant to atherosclerosis, were analyzed with the same method to reveal their structural preference, and the results of Polarity index analysis were verified by an alternate test, the Cumulative Distribution Function algorithm, applied to the same groups of lipoproteins.
    Źródło:
    Acta Biochimica Polonica; 2016, 63, 2; 235-241
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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