Identification of α-11 giardin as a flagellar and surface component of Giardia lamblia

Juri Kim, Hye Yeon Lee, Mi Ae Lee, Tai Soon Yong, Kyu Ho Lee, Soon Jung Park

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13 Citations (Scopus)


Giardia lamblia is a protozoan pathogen with distinct cytoskeletal structures, including median bodies and eight flagella. In this study, we examined components comprising G. lamblia flagella. Crude flagellar extracts were prepared from G. lamblia trophozoites, and analyzed by two-dimensional (2-D) gel electrophoresis. The 19 protein spots were analyzed by MALDI-TOF mass spectrometry, identifying ten metabolic enzymes, six distinct giardins, Giardia trophozoite antigen 1, translational initiation factor eIF-4A, and an extracellular signal-regulated kinase 2. Among the identified proteins, we studied α-11 giardin which belongs to a group of cytoskeletal proteins specific to Giardia. Western blot analysis and real-time PCR indicated that expression of α-11 giardin is not significantly increased during encystation of G. lamblia. Immunofluorescence assays using anti-α-11 giardin antibodies revealed that α-11 giardin protein mainly localized to the plasma membranes and basal bodies of the anterior flagella of G. lamblia trophozoites, suggesting that α-11 giardin is a genuine component of the G. lamblia cytoskeleton.

Original languageEnglish
Pages (from-to)227-233
Number of pages7
JournalExperimental Parasitology
Issue number2
Publication statusPublished - 2013 Oct

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Programs (No. 2009-0078120 and No. 2012RIAIA2004874 ) through the National Research Foundation (NRF) of the Ministry of Education, Science, and Technology, Korea.

All Science Journal Classification (ASJC) codes

  • Parasitology
  • Immunology
  • Infectious Diseases


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