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Erratum to: Gene cloning and characterization of a novel esterase from activated sludge metagenome

The original article was published in Microbial Cell Factories 2009 8:67

This article [1] was submitted and published without the permission of all original authors. An amended author list has been provided in this correction article and the Authors' contributions and Competing interests section modified accordingly. Mr Tao Zhang apologies to the other authors for this oversight.

Additionally figure three in the original article was completed by another colleague, is of a different protein to that stated and was used without his permission. A correct figure completed by Mr Tao Zhang of the correct protein can be found in this correction article (Fig 1).

Figure 1

SDS-PAGE of overexpressed esterase EstAS in E. coli. Lane 1: molecular weight protein marker (Tiangen, Cat. No: MP102); lane 2, E. coli/pET28a: total protein extract, as negative control; lane 3: induced culture of E. coli/pET28a, as negative control; lane 4: total protein extract E. coli/pEstAS-His; lane 5, total protein extract, induced culture of E. coli/pEstAS-His; lane 6: purified EstAS (31 kDa).

Mr Tao Zhang's institution has investigated this incident of author misconduct.


  1. 1.

    Zhang T, Han WJ, Liu ZP: Gene cloning and characterization of a novel esterase from activated sludge metagenome. Microb Cell Fact. 2009, 8: 67-10.1186/1475-2859-8-67.

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Author information

Correspondence to Tao Zhang or WenJun Han.

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Competing interests

The authors declare that they have no competing interests.

Authors' contributions

TZ contributed to the construction of metagenomic DNA library, esterese gene screening, enzyme characteristics analysis and manuscript drafting and revision.

WJH contributed to esterase gene cloning, EstAS expression vector construction and resequencing, data collection and manuscript revision.

The online version of the original article can be found at 10.1186/1475-2859-8-67

Authors’ original submitted files for images

Authors’ original file for figure 1

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