Abstract:
:Antimicrobial peptides (AMPs) constitute an important alternative in the search for new treatments against pathogens. We analyzed the sequence variability in cytokine and chemokine proteins to investigate whether these molecules contain a sequence useful in the development of new AMPs. Cluster analysis allowed the identification of tracts, grouped in five categories showing structure and sequence homology. The structure and function relationship among these groups, was analyzed using physicochemical parameters such as length, sequence, charge, hydrophobicity and helicity, which allowed the selection of a candidate that could constitute an AMP. This peptide comprises the C-terminal alpha-helix of chemokines CXCL4/PF-457-70. Far-UV CD spectroscopy showed that this molecule adopts a random conformation in aqueous solution and the addition of 2, 2, 2 trifluoroethanol (TFE) is required to induce a helical secondary structure. The CXCL4/PF-457-70 peptide was found to have antimicrobial activity and very limited hemolytic activity. The mechanism of action was analyzed using model kinetics and molecular dynamics. The kinetic model led to a reasonable assumption about a rate constant and regulatory step on its mechanism of action. Using molecular dynamics simulations, the structural properties the CXCL4/PF-457-70 have been examined in a membrane environment. Our results show that this peptide has a strong preference for binding to the lipid head groups, consequently, increasing the surface density and decreasing the lateral mobility of the lipids alters its functionality.
journal_name
Protein Pept Lettjournal_title
Protein and peptide lettersauthors
Robles-Gomez EE,Flores-Villegas MC,Gonzalez-Manjarrez A,Soriano-Garcia Mdoi
10.2174/0929866511320050001subject
Has Abstractpub_date
2013-05-01 00:00:00pages
489-98issue
5eissn
0929-8665issn
1875-5305pii
PPL-EPUB-20120904-3journal_volume
20pub_type
杂志文章abstract::In recent years, therapeutic proteins have become an important growing class of drugs in the pharmaceutics industry. The development of recombinant DNA technology has caused to appreciation of therapeutic value of many proteins and peptides in medicine. Currently, approximately 100 therapeutic proteins obtained approv...
journal_title:Protein and peptide letters
pub_type: 杂志文章,评审
doi:10.2174/092986652012131112125148
更新日期:2013-12-01 00:00:00
abstract::3-Isopropylmalate dehydrogenase (IPMDH) from Mycobacterium tuberculosis (Mtb) may be a target for specific drugs against this pathogenic bacterium. We have expressed and purified Mtb IPMDH and determined its physicalchemical and enzymological properties. Size-exclusion chromatography and dynamic light scattering measu...
journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
pub_type: 杂志文章,评审
doi:10.2174/0929866527666191227141713
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journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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更新日期:2006-01-01 00:00:00
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journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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更新日期:2007-01-01 00:00:00
abstract::It is important to understand the conformational biases that are present in unfolded states to understand protein folding. In this context, it is surprising that even a short tripeptide like AFA samples folded/ordered conformation as demonstrated recently by NMR experiments of the peptide in aqueous solution at 280 K....
journal_title:Protein and peptide letters
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更新日期:2007-01-01 00:00:00
abstract::The polypeptide leptin exerts a multitude of regulatory functions. It has been implicated in the pathophysiology of inflammatory, metabolic and psychiatric disorders and has been found to be differentially expressed in men and women. Although a clear increase of leptin levels with age has been repeatedly observed in m...
journal_title:Protein and peptide letters
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更新日期:2010-11-01 00:00:00
abstract::A recombinant human parathyroid hormone (rhPTH) fragment (Gly1-Gln26-rhPTH(1-34)) which contains two amino acids substitutions (Gly1 and Gln26) was acquired through Escherichia coli expression system using a soluble fusion protein strategy. The soluble fusion protein MBP-Gly1-Gln26-rhPTH(1-34) was harvested after puri...
journal_title:Protein and peptide letters
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更新日期:2008-01-01 00:00:00
abstract::DNA ligase is an important enzyme and it plays vital role in the replication and repair; also catalyzes nick joining between adjacent bases of DNA. The NAD(+) dependent DNA ligase is selectively present in eubacteria and few viruses; but missing in humans. Homology modeling was used to generate 3-D structure of NAD(+)...
journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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abstract::Increasing antibiotic resistance has led to an urgent need for new therapeutic approaches. Host defense peptides are known to be antimicrobial and have revealed broad immunomodulatory functions for both innate and adaptive immunity. This review will focus on the role of host defense peptides in infection and immune re...
journal_title:Protein and peptide letters
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abstract::Saturation Transfer Difference NMR (STD NMR) is used for the detection of the binding constant of the decapeptide RRRDDDSDDD with CK2α, the catalytic subunit of the proteinkinase CK2. For this work a valid irradiation frequency of the CK2α had to be found ensuring that no peptide resonance is affected by the irradiati...
journal_title:Protein and peptide letters
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abstract:BACKGROUND:Unstructured regions in proteins can vary from several amino acid residues to a completely disordered sequence. Since such regions play an important role in the protein functioning, much attention is being paid to their prediction. Special different programs are available for this purpose; however, predictio...
journal_title:Protein and peptide letters
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abstract::The human gut microbial ecosystem (HGME) exerts an important influence on the human health. In recent researches, meta-genomics provided deep insights into the HGME in terms of gene contents, metabolic processes and genome constitutions of meta-genome. Here we present a novel methodology to investigate the HGME on the...
journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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journal_title:Protein and peptide letters
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更新日期:2013-11-01 00:00:00
abstract::In mammals the M1 aminopeptidase family consists of nine different proteins, five of which are integral membrane proteins. The aminopeptidases are defined by two motifs in the catalytic domain; a zinc binding motif HEXXH-(X18)-E and an exopeptidase motif GXMEN. Aminopeptidases of this family are able to cleave a broad...
journal_title:Protein and peptide letters
pub_type: 杂志文章,评审
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更新日期:2004-10-01 00:00:00
abstract::We previously described a potent anthrax toxin inhibitor, based on a phage-library-selected peptide sequence, synthesized as a tetra-branched molecule on a lysine core and further modified for improvement of activity [Pini et al., Biochem. J., 2006, 395, 157]. This branched peptide had very low solubility because of s...
journal_title:Protein and peptide letters
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abstract::Migraine is a common neurologic condition marked by recurrent episodes of headache. Its pathophysiology is highly complex involving neuronal, inflammatory and vascular mechanisms. The Renin-Angiotensin System (RAS) can modulate all these mechanism, being a potential pharmacological target for migraine treatment. We ca...
journal_title:Protein and peptide letters
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更新日期:2020-01-01 00:00:00
abstract::Human butyrylcholinesterase (BuChE) is a serine enzyme present in most organs and plasma. No clear physiological function has yet been assigned to BuChE, but it is a pharmacologically and toxicologically important enzyme that plays a role in degradation of numerous ester-containing drugs and poisonous esters. Thus, Bu...
journal_title:Protein and peptide letters
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abstract::The studies presented here explore antimicrobial peptide preferential binding behavior for a target pathogen, Escherichia coli O157:H7. A modified immunoassay and surface plasmon resonance were employed to evaluate immobilized peptide binding of whole bacterial cells. The knowledge gained may guide the rational design...
journal_title:Protein and peptide letters
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abstract::A proof-of-principle methodology is presented in which all commercially-available cysteine (Cys) and selenocysteine (Sec) solid phase peptide synthesis (SPPS) derivatives are synthesized in high yield from easily prepared protected dichalcogenide precursors. A Zn-mediated biphasic reduction process applied to a series...
journal_title:Protein and peptide letters
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更新日期:2014-01-01 00:00:00
abstract::Chemical probing of histidine residues using specific modifiers, iodoacetic acid (IAA) and diethylpyrocarbonate (DEP) resulted in the inactivation of phytase (phy A). The kinetic theory of the substrate reaction during the modification of enzyme activity was applied to a study of the kinetics of the course of inactiva...
journal_title:Protein and peptide letters
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更新日期:2006-01-01 00:00:00
abstract:BACKGROUND:Cryptochrome is a flavin-binding blue-light photoreceptor that functions in growth and development in plants, the circadian clock in animals and navigation in birds. However, a lack of purified cryptochrome has hindered studies of the structure and function of this protein. In this study, we obtained a subst...
journal_title:Protein and peptide letters
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更新日期:2018-01-01 00:00:00