Phenotypic and genomic analysis of multiple heavy metal–resistant Micrococcus luteus strain AS2 isolated from industrial waste water and its potential use in arsenic bioremediation

  • Shahid Sher
  • Syed Zajif Hussain
  • Abdul RehmanEmail author
Environmental biotechnology


Multiple heavy metal–resistant bacterium, Micrococcus luteus strain AS2, was isolated from industrial waste water of District Sheikhupura, Pakistan. The isolated bacterium showed minimum inhibitory concentrations of 55 and 275 mM against arsenite and arsenate. The bacterial strain also showed resistance against other heavy metal ions, i.e., lead, cadmium, chromium, mercury, nickel, and zinc, apart from arsenic. The optimum temperature and pH were 37 °C and 7, respectively. The antioxidant enzymes such as catalase were significantly increased under arsenite stress. The increase in 43.9% of GSH/GSSG and 72.72% of non-protein thiol was determined under15 mM arsenite stress. Bacterial genome was sequenced through Illumina and Nanopore and genes related to arsenic and other heavy metals were identified and blast (tblastx) on NCBI. Through scanning electron microscopy, no morphological changes were observed in bacterial cells under arsenite stress. The peaks appeared in EDX showed that there is surface adsorption of arsenite in bacterial cell while it was confirmed from Fourier transformed infrared spectroscopy analysis that there is some interaction between arsenite and functional groups present on the surface of bacterial cell. The SDS-PAGE analysis of whole-cell proteins under 15 mM arsenite stress clearly revealed that there is upregulation of some proteins in ranged of 60 to 34 kDa. The bioremediation efficiency (E) of bacterial biomass was 72% after 2 h and 99% after 10 h. The bioremediation efficiency of bacterial biomass is an indicator for the isolated bacterium to employ as a potential candidate for the amelioration of sites contaminated with arsenic.


Arsenite Heavy metals Micrococcus luteus AS2 Antioxidant enzymes Bioremediation 


Funding information

The Higher Education Commission (HEC) provided funds to the first author to visit Denmark under IRSIP program.

Compliance with ethical standards

Conflict of interest

The authors declared that they have no conflict of interest.

Ethical statement

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  • Shahid Sher
    • 1
  • Syed Zajif Hussain
    • 2
  • Abdul Rehman
    • 1
    Email author
  1. 1.Department of Microbiology and Molecular GeneticsUniversity of the PunjabLahorePakistan
  2. 2.Department of Chemistry, SBA School of Sciences and Engineering (SBASSE)Lahore University of Management Sciences (LUMS)LahorePakistan

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