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1.

001-es BibID:BIBFORM106470
035-os BibID:(WoS)000915651700001 (Scopus)85146742732
Első szerző:Czajlik András (gyógyszerész)
Cím:DMSO-Induced Unfolding of the Antifungal Disulfide Protein PAF and Its Inactive Variant: A Combined NMR and DSC Study / András Czajlik, Ágnes Batta, Kinga Kerner, Ádám Fizil, Dorottya Hajdu, Mária Raics, Katalin E. Kövér, Gyula Batta
Dátum:2023
ISSN:1422-0067
Megjegyzések:PAF and related antifungal proteins are promising antimicrobial agents. They have highly stable folds around room temperature due to the presence of 3-4 disulfide bonds. However, unfolded states persist and contribute to the thermal equilibrium in aqueous solution, and low-populated states might influence their biological impact. To explore such equilibria during dimethyl sulfoxide (DMSO)-induced chemical unfolding, we studied PAF and its inactive variant PAFD19S using nuclear magnetic resonance (NMR) and differential scanning calorimetry (DSC). According to the NMR monitoring at 310 K, the folded structures disappear above 80 v/v% DMSO concentration, while the unfolding is completely reversible. Evaluation of a few resolved peaks from viscosity-compensated 15N-1H HSQC spectra of PAF yielded G = 23 ± 7 kJ/M as the average value for NMR unfolding enthalpy. The NMR-based structures of PAF and the mutant in 50 v/v% DMSO/H2O mixtures were more similar in the mixed solvents then they were in water. The 15N NMR relaxation dynamics in the same mixtures verified the rigid backbones of the NMR-visible fractions of the proteins; still, enhanced dynamics around the termini and some loops were observed. DSC monitoring of the Tm melting point showed parabolic dependence on the DMSO molar fraction and suggested that PAF is more stable than the inactive PAFD19S. The DSC experiments were irreversible due to the applied broad temperature range, but still suggestive of the endothermic unfolding of PAF.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
antifungal protein
PAF
disulfide bond
DMSO-induced unfolding
nuclear magnetic resonance (NMR)
differential scanning calorimetry (DSC)
Megjelenés:International Journal Of Molecular Sciences. - 24 : 2 (2023), p. 1-13. -
További szerzők:Batta Ágnes Kerner Kinga Fizil Ádám (1988-) (biológus) Hajdu Dorottya (1987-) (biológus) Hadháziné Raics Mária (1991-) (vegyész) Kövér Katalin, E. (1956-2023) (vegyész) Batta Gyula (1953-) (molekula-szerkezet kutató)
Pályázati támogatás:TKP2020-NKA-11
Egyéb
NN 128368
OTKA
GINOP-2.3.2-15-2016-00008
GINOP
GINOP-2.3.3-15-2016-00004
GINOP
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2.

001-es BibID:BIBFORM090877
035-os BibID:(scopus)85099978064 (wos)000615359000001
Első szerző:Czajlik András (gyógyszerész)
Cím:Solution Structure, Dynamics, and New Antifungal Aspects of the Cysteine-Rich Miniprotein PAFC / András Czajlik, Jeanett Holzknecht, László Galgóczy, Liliána Tóth, Péter Poór, Attila Ördög, Györgyi Váradi, Alexander Kühbacher, Attila Borics, Gábor K. Tóth, Florentine Marx, Gyula Batta
Dátum:2021
ISSN:1661-6596 1422-0067
Megjegyzések:The genome of Penicillium chrysogenum Q176 contains a gene coding for the 88-amino-acid (aa)-long glycine- and cysteine-rich P. chrysogenum antifungal protein C (PAFC). After maturation, the secreted antifungal miniprotein (MP) comprises 64 aa and shares 80% aa identity with the bubble protein (BP) from Penicillium brevicompactum, which has a published X-ray structure. Our team expressed isotope (15N, 13C)-labeled, recombinant PAFC in high yields, which allowed us to determine the solution structure and molecular dynamics by nuclear magnetic resonance (NMR) experiments. The primary structure of PAFC is dominated by 14 glycines, and therefore, whether the four disulfide bonds can stabilize the fold is challenging. Indeed, unlike the few published solution structures of other antifungal MPs from filamentous ascomycetes, the NMR data indicate that PAFC has shorter secondary structure elements and lacks the typical ??-barrel structure, though it has a positively charged cavity and a hydrophobic core around the disulfide bonds. Some parts within the two putative ??-core motifs exhibited enhanced dynamics according to a new disorder index presentation of 15N-NMR relaxation data. Furthermore, we also provided a more detailed insight into the antifungal spectrum of PAFC, with specific emphasis on fungal plant pathogens. Our results suggest that PAFC could be an effective candidate for the development of new antifungal strategies in agriculture.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Penicillium chrysogenum
antifungal protein PAFC
γ-core motif
solution structure
dynamics
nuclear magnetic resonance
plant protection
Megjelenés:International Journal of Molecular Sciences. - 22 : 3 (2021), p. 1-23. -
További szerzők:Holzknecht, Jeanett Galgóczy László (1950-) Tóth Liliána Poór Péter Ördög Attila Váradi Györgyi Kühbacher, Alexander Borics Attila Tóth Gábor K. Marx, Florentine Batta Gyula (1953-) (molekula-szerkezet kutató)
Pályázati támogatás:NKFIH FK 134343
Egyéb
NKFIH PD 134284
Egyéb
GINOP-2.3.2-15-2016-00008
GINOP
GINOP-2.3.3-15-2016-00004
GINOP
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Intézményi repozitóriumban (DEA) tárolt változat
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3.

001-es BibID:BIBFORM076180
035-os BibID:(cikkazonosító)e0204825 (WOS)000447417900013 (Scopus)85055079512
Első szerző:Fizil Ádám (biológus)
Cím:Calcium binding of the antifungal protein PAF: Structure, dynamics and function aspects by NMR and MD simulations / Ádám Fizil, Christoph Sonderegger, András Czajlik, Attila Fekete, István Komáromi, Dorottya Hajdu, Florentine Marx, Gyula Batta
Dátum:2018
ISSN:1932-6203
Megjegyzések:Calcium ions (Ca2+) play an important role in the toxicity of the cysteine-rich and cationic antifungal protein PAF from Penicillium chrysogenum: high extracellular Ca2+ levels reduce the toxicity of PAF in the sensitive model fungus Neurospora crassa in a concentration dependent way. However, little is known about the mechanistic details of the Ca2+ ion impact and the Ca2+ binding capabilities of PAF outside the fungal cell, which might be the reason for the activity loss. Using nuclear magnetic resonance (NMR), isothermal titration calorimetry and molecular dynamics (MD) simulations we demonstrated that PAF weakly, but specifically binds Ca2+ ions. MD simulations of PAF predicted one major Ca2+ binding site at the C-terminus involving Asp53 and Asp55, while Asp19 was considered as putative Ca2+ binding site. The exchange of Asp19 to serine had little impact on the Ca2+ binding, however caused the loss of antifungal activity, as was shown in our recent study. Now we replaced the C-terminal aspartates and expressed the serine variant PAF{D53S/D55S}. The specific Ca2+ binding affinity of PAF{D53S/D55S} decreased significantly if compared to PAF, whereas the antifungal activity was retained. To understand more details of Ca2+ interactions, we investigated the NMR and MD structure/dynamics of the free and Ca2+-bound PAF and PAF{D53S/D55S}. Though we found some differences between these protein variants and the Ca2+ complexes, these effects cannot explain the observed Ca2+ influence. In conclusion, PAF binds Ca2+ ions selectively at the C-terminus; however, this Ca2+ binding does not seem to play a direct role in the previously documented modulation of the antifungal activity of PAF.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Plos One. - 13 : 10 (2018), p. 1-19. -
További szerzők:Sonderegger, Christoph Czajlik András (1975-) (gyógyszerész) Fekete Attila (1983-) (vegyész) Komáromi István (1957-) (vegyész, molekuláris biológus, biokémikus) Hajdu Dorottya (1987-) (biológus) Marx, Florentine Batta Gyula (1953-) (molekula-szerkezet kutató)
Pályázati támogatás:ANN 110821
OTKA
TÁMOP-4.2.1/B-09/1/KONV-2010-0007
TÁMOP
GINOP-2.3.2-15-2016-00008
GINOP
GINOP-2.3.3-15-2016-00004
GINOP
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Intézményi repozitóriumban (DEA) tárolt változat
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4.

001-es BibID:BIBFORM127417
035-os BibID:(Scopus)85217647241 (WoS)001418685000001
Első szerző:Gai, Jiawei
Cím:Small disulfide proteins with antifungal impact: NMR experimental structures as compared to models of alphafold versions / Jiawei Gai, Márk File, Réka Erdei, András Czajlik, Florentine Marx, László Galgóczy, Györgyi Váradi, Gyula Batta
Dátum:2025
ISSN:1661-6596 1422-0067
Megjegyzések:In response to the growth of emerging resistance to conventional antifungal drugs, antifungal proteins (AFPs) of filamentous Ascomycetes origin have been discovered in recent years. Understanding the structure of AFPs is crucial for elucidating their antifungal mechanisms and developing new therapeutic agents. While nuclear magnetic resonance (NMR) has proven effective in determining the structures of small proteins, some AFP structures remain unresolved, necessitating the use of alternative prediction methods. Through bioinformatics analysis and heatmaps of amino acid sequence identity and similarity matrix, we categorized AFPs into three major classes and six subcategories, revealing structural and bioactivity differences. We employed AlphaFold (AF) to predict the 3D structures of six different AFPs, with predictions compared to NMR-derived structures. The results demonstrated a high degree of consistency between AF and NMR structures, with AF excelling in structural quality assessment and accurately capturing complex disulfide bond patterns. Both AF2 and AF3 models outperform the NMR model in overall structural quality and coherence, with AF3 showing the best performance. However, the limitations of AF should be considered, including its reduced accuracy in predicting multi-metal ion complexes, suboptimal performance in highly flexible or disordered regions, and its inability to account for multiple conformers, as it generates only a single dominant structure. Moreover, while AF3 accurately predicts all disulfide bond patterns, AF2 falls short in this regard. This study verifies the reliability of AF in the structural prediction of cysteine-rich AFPs while highlighting these constraints, offering important support for the rational design of new protein-based antifungal drugs.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
antifungal proteins
AlphaFold
NMR
disulfide proteins
mini-protein
Megjelenés:International Journal of Molecular Sciences. - 26 : 3 (2025), p. 1-25. -
További szerzők:File Márk Erdei Réka Czajlik András (1975-) (gyógyszerész) Marx, Florentine Galgóczy László (1950-) Váradi Györgyi Batta Gyula (1953-) (molekula-szerkezet kutató)
Pályázati támogatás:NKFIH FK 134343
Egyéb
NKFIH K 146131
Egyéb
GINOP-2.3.2-15-2016-00008
GINOP
GINOP-2.3.3-15-2016-00004
GINOP
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Intézményi repozitóriumban (DEA) tárolt változat
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5.

001-es BibID:BIBFORM077292
035-os BibID:(WoS)000466621200053 (Scopus)85061541042
Első szerző:Hajdu Dorottya (biológus)
Cím:Solution structure and novel insights into phylogeny and mode of action of the Neosartorya (Aspergillus) fischeri antifungal protein (NFAP) / Hajdu Dorottya, Huber Anna, Czajlik András, Tóth Liliána, Kele Zoltán, Kocsubé Sándor, Fizil Ádám, Marx Florentine, Galgóczy László, Batta Gyula
Dátum:2019
ISSN:0141-8130
Megjegyzések:Small, cysteine-rich and cationic antifungal proteins fromnatural sources are promising candidates for the development of novel treatment strategies to prevent and combat infections caused by drug-resistant fungi. However, limited information about their structure and antifungal mechanism hampers their future applications. In the present study, we determined the solution structure, dynamics and associated solvent areas of the Neosartorya (Aspergillus) fischeri antifungal protein NFAP. Genome mining within the genus revealed the presence of orthologous genes in N. fischeri and Neosartorya spathulata, and genes encoding closely related proteins can be found in Penicillium brasiliensis and Penicillium oxalicum. We show that the tertiary structure of these putative proteins can be resolved using the structure of NFAP as reliable template for in silico prediction. Localization studies with fluorescence-labelled protein pointed at an energy-dependent uptake mechanism of NFAP in the sensitive model fungus Neurospora crassa and subsequent cytoplasmic localization coincided with cell-death induction. The presented results contribute to a better understanding of the structure/function relationship of NFAP and related proteins and pave the way towards future antifungal drug development.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Neosartorya (Aspergillus) fischeri antifungal
protein (NFAP)
Nuclear magnetic resonance (NMR)
Antifungal mechanism
Megjelenés:International Journal of Biological Macromolecules. - 129 (2019), p. 511-522.
További szerzők:Huber Anna Czajlik András (1975-) (gyógyszerész) Tóth Liliána Kele Zoltán Kocsubé Sándor Fizil Ádám (1988-) (biológus) Marx, Florentine Galgóczy László (1950-) Batta Gyula (1953-) (molekula-szerkezet kutató)
Pályázati támogatás:GINOP-2.3.2-15-2016-00008
GINOP
GINOP-2.3.3-15-2016-00004
GINOP
PD 120808
OTKA
ANN 122833
OTKA
ANN 110821
OTKA
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Intézményi repozitóriumban (DEA) tárolt változat
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6.

001-es BibID:BIBFORM072198
035-os BibID:(Cikkazonosító)1751 (WOS)000423429800003 (Scopus)85041371349
Első szerző:Huber Anna
Cím:New Antimicrobial Potential and Structural Properties of PAFB: A Cationic, Cysteine-Rich Protein from Penicillium chrysogenum Q176 / Anna Huber, Dorottya Hajdu, Doris Bratschun-Khan, Zoltán Gáspári, Mihayl Varbanov, Stéphanie Philippot, Ádám Fizil, András Czajlik, Zoltán Kele, Christoph Sonderegger, László Galgóczy, Andrea Bodor, Florentine Marx, Gyula Batta
Dátum:2018
ISSN:2045-2322
Megjegyzések:Small, cysteine-rich and cationic proteins with antimicrobial activity are produced by diverse organisms of all kingdoms and represent promising molecules for drug development. The ancestor of all industrial penicillin producing strains, the ascomycete Penicillium chryosgenum Q176, secretes the extensively studied antifungal protein PAF. However, the genome of this strain harbours at least two more genes that code for other small, cysteine-rich and cationic proteins with potential antifungal activity. In this study, we characterized the pafB gene product that shows high similarity to PgAFP from P. chrysogenum R42C. Although abundant and timely regulated pafB gene transcripts were detected, we could not identify PAFB in the culture broth of P. chrysogenum Q176. Therefore, we applied a P. chrysogenum-based expression system to produce sufficient amounts of recombinant PAFB to address unanswered questions concerning the structure and antimicrobial function. Nuclear magnetic resonance (NMR)-based analyses revealed a compact [beta]-folded structure, comprising five [beta]-strands connected by four solvent exposed and flexible loops and an "abcabc" disulphide bond pattern. We identified PAFB as an inhibitor of growth of human pathogenic moulds and yeasts. Furthermore, we document for the first time an anti-viral activity for two members of the small, cysteine-rich and cationic protein group from ascomycetes.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Scientific Reports. - 8 : 1 (2018), p. 1751. -
További szerzők:Hajdu Dorottya (1987-) (biológus) Bratschun-Khan, Doris Gáspári Zoltán Varbanov, Mihayl Philippot, Stéphanie Fizil Ádám (1988-) (biológus) Czajlik András (1975-) (gyógyszerész) Kele Zoltán Sonderegger, Christoph Galgóczy László (1950-) Bodor Andrea Marx, Florentine Batta Gyula (1953-) (molekula-szerkezet kutató)
Pályázati támogatás:ANN 110821
OTKA
GINOP-2.3.2-15-2016-00008
GINOP
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Intézményi repozitóriumban (DEA) tárolt változat
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7.

001-es BibID:BIBFORM123631
035-os BibID:(Scopus)85201638851 (WoS)001293298800001
Első szerző:Pavela Olivér
Cím:Mapping of the Lipid-Binding Regions of the Antifungal Protein NFAP2 by Exploiting Model Membranes / Olivér Pavela, Tünde Juhász, Liliána Tóth, András Czajlik, Gyula Batta, László Galgóczy, Tamás Beke-Somfai
Dátum:2024
ISSN:1549-9596
Megjegyzések:Fungal infections with high mortality rates represent an increasing health risk. The Neosartorya (Aspergillus) fischeri antifungal protein 2 (NFAP2) is a small, cysteine-rich, cationic protein exhibiting potent anti-Candida activity. As the underlying mechanism, pore formation has been demonstrated; however, molecular level details on its membrane disruption action are lacking. Herein, we addressed the lipid binding of NFAP2 using a combined computational and experimental approach to simple lipid compositions with various surface charge properties. Simulation results revealed binding preferences for negatively charged model membranes, where selectivity is mediated by anionic lipid components enriched at the protein binding site but also assisted by zwitterionic lipid species. Several potential binding routes initiated by various anchoring contacts were observed, which resulted in one main binding mode and a few variants, with NFAP2 residing on the membrane surface. Region (10)NCPNNCKHKKG(20) of the flexible N-terminal part of the protein showed potency to insert into the lipid bilayer, where the disulfide bond-stabilized short motif (CPNNC15)-C-11 could play a key role. In addition, several areas, including the beginning of the N-terminal (residues 1-8), played roles in facilitating initial membrane contacts. Besides, individual roles of residues such as Lys24, Lys32, Lys34, and Trp42 were also revealed by the simulations. Combined data demonstrated that the solution conformation was not perturbed markedly upon membrane interaction, and the folded part of the protein also contributed to stabilizing the bound state. Data also highlighted that the binding of NFAP2 to lipid vesicles is sensitively affected by environmental factors such as ionic strength. Electrostatic interactions driven by anionic lipids were found pivotal, explaining the reduced membrane activity observed under high salt conditions. Experimental data supported the lipid-selective binding mechanisms and pointed to salt-dependent effects, particularly to protein-assisted vesicle aggregation at low ionic strength. Our findings can contribute to the development of NFAP2-based anti-Candida agents and studies aiming at future medical use of peptide-based natural antifungal compounds.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Journal of Chemical Information and Modeling. - 64 : 16 (2024), p. 6557-6569. -
További szerzők:Juhász Tünde Tóth Liliána Czajlik András (1975-) (gyógyszerész) Batta Gyula (1953-) (molekula-szerkezet kutató) Galgóczy László (1950-) Beke-Somfai Tamás
Pályázati támogatás:LP2016-2
MTA
NKFIH - NVKP_16-1-2016-0007
Egyéb
TKP2021-EGA-31
Egyéb
NKFIH - KKP22 144180
Egyéb
NKFIH - 2018-1.2.1-NKP-2018-00005
Egyéb
2020-1-1-2-PIACI-KFI_2020-00021
Egyéb
SA-87/2021
Egyéb
KEP-5/2021
Egyéb
FK134343
OTKA
K 146131
OTKA
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Intézményi repozitóriumban (DEA) tárolt változat
Borító:

8.

001-es BibID:BIBFORM100354
035-os BibID:(Scopus)85123627412
Első szerző:Sánta Anna
Cím:Resonance assignment of the Shank1 PDZ domain / Sánta Anna, Czajlik András, Batta Gyula, Péterfia Bálint, Gáspári Zoltán
Dátum:2022
ISSN:1874-2718 1874-270X
Megjegyzések:Shank proteins are among the most abundant and well-studied postsynaptic scaffold proteins. Their PDZ domain has unique characteristics as one of its loop regions flanking the ligand-binding site is uniquely long and has also been implicated in the formation of PDZ dimers. Here we report the initial characterization of the Shank1 PDZ domain by solution NMR spectroscopy. The assigned chemical shifts are largely consistent with the common features of PDZ domains in general and the available Shank PDZ crystal structures in particular. Our analysis suggests that under the conditions investigated, the domain is monomeric and the unique loop harbors a short helical segment, observed in only one of the known X-ray structures so far. Our work stresses the importance of solution-state investigations to fully decipher the functional relevance of the structural and dynamical features unique to Shank PDZ domains.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Shank1
PDZ domain
Helical propensity
Monomeric
Megjelenés:Biomolecular NMR Assignments. - 16 : 1 (2022), p. 121-127. -
További szerzők:Czajlik András (1975-) (gyógyszerész) Batta Gyula (1953-) (molekula-szerkezet kutató) Péterfia Bálint Gáspári Zoltán
Pályázati támogatás:NN 124363
Egyéb
TKP2020-NKA-11
Egyéb
GINOP-2.3.2-15-2016-00008
GINOP
GINOP-2.3.3-15-2016-00004
GINOP
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Intézményi repozitóriumban (DEA) tárolt változat
Borító:

9.

001-es BibID:BIBFORM113291
035-os BibID:(Scopus)85162082479 (WoS)001010056600001
Első szerző:Váradi Györgyi
Cím:Hard nut to crack: Solving the disulfide linkage pattern oftheNeosartorya(Aspergillus)fischeriantifungal protein 2 / Györgyi Váradi Zoltán Kele András Czajlik, Attila Borics, Gábor Bende, Csaba Papp, Gábor Rákhely,Gábor K. Tóth, Gyula Batta, László Galgóczy
Dátum:2023
ISSN:0961-8368
Megjegyzések:As a consequence of the fast resistance spreading, a limited number of drugs are available to treat fungal infections. Therefore, there is an urgent need to develop new antifungal treatment strategies. The features of a disulfide bond- stabilized antifungal protein, NFAP2 secreted by the mold Neosartorya (Asper- gillus) fischeri render it to be a promising template for future protein-based antifungal drug design, which requires knowledge about the native disulfide linkage pattern as it is one of the prerequisites for biological activity. However, in the lack of tryptic and chymotryptic proteolytic sites in the ACNCPNNCK sequence, the determination of the disulfide linkage pattern of NFAP2 is not easy with traditional mass spectrometry-based methods. According to in silico predictions working with a preliminary nuclear magnetic resonance (NMR) solution structure, two disulfide isomers of NFAP2 (abbacc and abbcac) were possible. Both were chemically synthesized; and comparative reversed-phase high-performance liquid chromatography, electronic circular dichroism and NMR spectroscopy analyses, and antifungal susceptibility and efficacy tests indicated that the abbcac is the native pattern. This knowledge allowed rational modification of NAFP2 to improve the antifungal efficacy and spectrum through the modulation of the evolutionarily conserved ?-core region, which is responsible for the activity of several antimicrobial peptides. Disruption of the steric structure of NFAP2 upon ?-core modification led to the conclusions that this motif may affect the formation of the biologically active three-dimensional structure, and that the ?-core modulation is not an efficient tool to improve the antifungal efficacy or to change the antifungal spectrum of NFAP2.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Protein Science. - 32 : 7 (2023), p. 1-13. -
További szerzők:Kele Zoltán Czajlik András (1975-) (gyógyszerész) Borics Attila Bende Gábor Papp Csaba Rákhely Gábor Tóth Gábor K. Batta Gyula (1953-) (molekula-szerkezet kutató) Galgóczy László (1950-)
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Intézményi repozitóriumban (DEA) tárolt változat
Borító:

10.

001-es BibID:BIBFORM109184
035-os BibID:(Scopus)85149121543 (WoS)000939526000001
Első szerző:Váradi Györgyi
Cím:Confirmation of the Disulfide Connectivity and Strategies for Chemical Synthesis of the Four-Disulfide-Bond-Stabilized Aspergillus giganteus Antifungal Protein, AFP / Györgyi Váradi, Gyula Batta, László Galgóczy, Dorottya Hajdu, Ádám Fizil, András Czajlik, Máté Virágh, Zoltán Kele, Vera Meyer, Sascha Jung, Florentine Marx, Gábor K. Tóth
Dátum:2023
ISSN:0163-3864 1520-6025
Megjegyzések:Emerging fungal infections require new, more efficient antifungal agents and therapies. AFP, a protein from Aspergillus giganteus with four disulfide bonds, is a promising candidate because it selectively inhibits the growth of filamentous fungi. In this work, the reduced form of AFP was prepared using native chemical ligation. The native protein was synthesized via oxidative folding with uniform protection for cysteine thiols. AFP's biological activity depends heavily on the pattern of natural disulfide bonds. Enzymatic digestion and MS analysis provide proof for interlocking disulfide topology (abcdabcd) that was previously assumed. With this knowledge, a semi-orthogonal thiol protection method was designed. By following this strategy, out of a possible 105, only 6 disulfide isomers formed and 1 of them proved to be identical with the native protein. This approach allows the synthesis of analogs for examining structure-activity relationships and, thus, preparing AFP variants with higher antifungal activity.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Journal of Natural Products. - 86 : 4 (2023), p. 782-790. -
További szerzők:Batta Gyula (1953-) (molekula-szerkezet kutató) Galgóczy László (1950-) Hajdu Dorottya (1987-) (biológus) Fizil Ádám (1988-) (biológus) Czajlik András (1975-) (gyógyszerész) Virágh Máté Kele Zoltán Meyer, Vera Jung, Sascha Marx, Florentine Tóth Gábor K.
Pályázati támogatás:NKFIH TKP2021-EGA-32
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NKFIH FK 134343
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