New Antimicrobial Potential and Structural Properties of PAFB: A Cationic, Cysteine-Rich Protein from Penicillium chrysogenum Q176.

New Antimicrobial Potential and Structural Properties of PAFB: A Cationic, Cysteine-Rich Protein from Penicillium chrysogenum Q176.
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DOI:
10.1038/s41598-018-20002-2
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发表时间:
2018-01-29
期刊:
影响因子:
4.6
通讯作者:
Batta G
Batta G
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Huber A;Hajdu D;Bratschun-Khan D;Gáspári Z;Varbanov M;Philippot S;Fizil Á;Czajlik A;Kele Z;Sonderegger C;Galgóczy L;Bodor A;Marx F;Batta G

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具有抗微生物活性的富含半胱氨酸的阳离子小蛋白质由所有界的多种生物体产生,并且代表用于药物开发的有前景的分子。产黄青霉Q176是所有工业青霉素生产菌株的祖先,其分泌被广泛研究的抗真菌蛋白PAF。然而,该菌株的基因组含有至少两个以上的基因,这些基因编码具有潜在抗真菌活性的其他小的、富含半胱氨酸的阳离子蛋白。在这项研究中,我们表征了pafB基因产物,其显示出与产黄青霉R42C的PgAFP高度相似。虽然pafB基因的转录本中检测到丰富的和及时的调节,我们不能确定产黄青霉Q176的培养液中的PAFB。因此,我们应用基于产黄青霉的表达系统来产生足够量的重组PAFB,以解决关于结构和抗微生物功能的未回答的问题。基于核磁共振(NMR)的分析揭示了紧凑的β折叠结构,其包括由四个溶剂暴露的柔性环连接的五条β链和“abcabc”二硫键模式。我们确定PAFB作为人类致病性霉菌和酵母菌生长的抑制剂。此外,我们首次记录了子囊菌中两个富含半胱氨酸的小阳离子蛋白质组成员的抗病毒活性。
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 β-folded structure, comprising five β-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.
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