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Scientia Silvae Sinicae ›› 2015, Vol. 51 ›› Issue (5): 68-77.doi: 10.11707/j.1001-7488.20150508

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Cloning and Bioinformatics Analysis of MnP 1 cDNA Gene from Hericium erinaceum

Yin Liwei1,2, Chi Yujie2   

  1. 1. School of Life Science, Anqing Normal University Anqing 246011;
    2. School of Forestry, Northeast Forestry University Harbin 150040
  • Received:2014-09-06 Revised:2014-11-13 Online:2015-05-25 Published:2015-06-11

Abstract:

【Objective】 The cDNA gene sequences of Manganese peroxidase (MnP) were isolated from H. erinaceum CB1, and used for analyzing structure and function of the He-mnp 1.【Method】Degenerate primers were designed according to conservative domain of white-rot fungi MnPs gene cDNA sequences reported in GenBank, the full-length cDNA gene sequence was obtained by using the methods of PCR, Reverse transcription-PCR and Rapid Amplification of cDNA Ends (RACE) and named as He-mnp 1 (GenBank No. HM116841.3), and the bioinformatics of He-mnp 1 gene were analyzed. BLAST homology search was conducted through the NCBI database; ORF Finder was used to look up the complete open reading frame of the gene; The Expasy database and BioEdit software were used to predict physicochemical properties and amino acid composition of He-mnp 1 protein, and analyze the hydrophilicity/hydrophobicity and transmembrane region; The SignalP 4.1 software was used to predict protein signal peptide; The clustal W with MEGA 5.1 software was adopted to complete the He-mnp1 protein sequence homology alignment and to construct the phylogenetic trees of white rot fungi MnPs, respectively. The CDD database was used to predict protein conserved domains, and check the He-mnp1 heme, substrate and manganese, calcium binding site etc. The PredictProtein software and SWISS-MODEL software were used to complete the He-mnp1 protein secondary structure prediction and to construct homologous 3D modeling, respectively.【Result】The full-length cDNA of He-mnp 1 was 1 279 bp, the ORF of 1 080 bp with starting codon of ATG and stopping codon of TAA, including 5'UTR of 68 bps and 3'UTR of 131 bps and encoded 359 amino acids. Bioinformatics analysis showed that the He-mnp1 protein has the highest content of Ala, without Tyr, and the Mw 38.18 is kDa, with the pI of 4.35. The He-nmp1 protein has an obvious hydrophilic region and two hydrophobic regions in the area of 81-105 and 121-141, and belongs to hydrophilic protein. He-mnp1 protein precursor polypeptides consists of a 18 aa signal peptide and a 5 aa the intermediate leader peptide.【Conclusion】Protein phylogenetic analysis revealed that He-mnp1 is distributed in Group II, and has closely evolutionary relationship to MnPs of Pleurotus ostreatus, Polyporus brumalis, and Trametes versicolor. He-mnp 1 has a conserved domain, and belongs to Class II fungal heme-dependent peroxidase superfamily, predicting that the protein secondary structure accounts for α-helix of 30.99%, β-sheet of 3.38% and random coil of 65.63%, and it is a stable protein. He-mnp1 protein 3D modeling showed that there are 1 Fe heme, 2 Ca2+, 1 Mn2+ binding sites and the histidine residues.

Key words: Hericium erinaceum, manganese peroxidase, genomic clone, bioinformatics analysis, sequence analysis

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