Biochemistry (Moscow)

, Volume 82, Issue 7, pp 821–825 | Cite as

Escherichia coli signal peptidase recognizes and cleaves archaeal signal sequence

  • Majida Atta Muhammad
  • Samia Falak
  • Naeem RashidEmail author
  • Qurra-tul-Ann Afza Gardner
  • Nasir Ahmad
  • Tadayuki Imanaka
  • Muhammad Akhtar


Tk1884, an open reading frame encoding α-amylase in Thermococcus kodakarensis, was cloned with the native signal sequence and expressed in Escherichia coli. Heterologous gene expression resulted in secretion of the recombinant protein to the extracellular culture medium. Extracellular α-amylase activity gradually increased after induction. Tk1884 was purified from the extracellular medium, and its molecular mass determined by electrospray ionization mass spectrometry indicated the cleavage of a few amino acids. The N-terminal amino acid sequence of the purified Tk1884 was determined, which revealed that the signal peptide was cleaved between Ala26 and Ala27 by E. coli signal peptidase. To the best of our knowledge, this is the first report describing an archaeal signal sequence recognized and cleaved by E. coli signal peptidase.


α-amylase Thermococcus kodakarensis signal peptide purification mass spectrometry N-terminal sequencing 


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Supplementary material

10541_2017_463_MOESM1_ESM.pdf (830 kb)
Majida Atta Muhammad, Samia Falak, Naeem Rashid, Qurra-tul-Ann Afza Gardner, Nasir Ahmad, Tadayuki Imanaka, and Muhammad Akhtar, Escherichia coli Signal Peptidase Recognizes and Cleaves Archaeal Signal Sequence (ISSN 0006-2979, Biochemistry (Moscow), 2017, Vol. 82, No. 7, pp. 821–825)


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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  • Majida Atta Muhammad
    • 1
  • Samia Falak
    • 1
  • Naeem Rashid
    • 1
    Email author
  • Qurra-tul-Ann Afza Gardner
    • 1
  • Nasir Ahmad
    • 2
  • Tadayuki Imanaka
    • 3
  • Muhammad Akhtar
    • 1
    • 4
  1. 1.University of the Punjab, School of Biological SciencesLahorePakistan
  2. 2.University of the Punjab, Institute of Agricultural SciencesLahorePakistan
  3. 3.Ritsumeikan University, The Research Organization of Science and TechnologyKusatsu, ShigaJapan
  4. 4.University of Southampton, School of Biological SciencesSouthamptonUK

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