Abstract
The rhg gene encoding a rhamnogalacturonase was isolated from the novel strain A1 of Aspergillus niger. It consists of an ORF of 1.505 kb encoding a putative protein of 446 amino acids with a predicted molecular mass of 47 kDa, belonging to the family 28 of glycosyl hydrolases. The nature and position of amino acids comprising the active site as well as the three-dimensional structure were well conserved between the A. niger CTM10548 and fungal rhamnogalacturonases. The coding region of the rhg gene is interrupted by three short introns of 56 (introns 1 and 3) and 52 (intron 2) bp in length. The comparison of the peptide sequence with A. niger rhg sequences revealed that the A1 rhg should be an endo-rhamnogalacturonases, more homologous to rhg A than rhg B A. niger known enzymes. The comparison of rhg nucleotide sequence from A. niger A1 with rhg A from A. niger shows several base changes. Most of these changes (59 %) are located at the third base of codons suggesting maintaining the same enzyme function. We used the rhamnogalacturonase A from Aspergillus aculeatus as a template to build a structural model of rhg A1 that adopted a right-handed parallel β-helix.
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With deep sadness, we dedicate this work to the Memory of Dr. Noomen Hadj Taeib, one of the co-authors who passed away before the release of this research paper. Lamia Jmal-Hammami and Mosbeh Dardouri are thanked for their technical help. We thank Professors Raja Mokdad-Gargouri and Hafedh Belghith for the fruitful discussion of scientific interpretations. This work was supported by Grants from the Ministry of Higher Education and Scientific Research, Tunisia.
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Damak, N., Abdeljalil, S., Taeib, N.H. et al. Cloning and Genomic Organization of a Rhamnogalacturonase Gene from Locally Isolated Strain of Aspergillus niger . Appl Biochem Biotechnol 176, 2314–2327 (2015). https://doi.org/10.1007/s12010-015-1720-1
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DOI: https://doi.org/10.1007/s12010-015-1720-1