Cited by 19S100 Proteins and AnnexinsParasitic Infections and DiagnosticsProtein Structure and Dynamics

Annexin XXI (ANX21) of Giardia lamblia Has Sequence Motifs Uniquely Shared by Giardial Annexins and Is Specifically Localized in the Flagella

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Szkodowska, Anna, Müller, Monika C.M., Linke, Christoph, Scholze, Henning·2002·Journal of Biological Chemistry

Abstract

We have identified a novel annexin, ANX21, in trophozoites of Giardia lamblia. The nucleotide sequence encoding this protein deviated from a published sequence in predicting an additional endonexin fold in the fourth annexin domain. In addition, several motifs exclusively shared by other annexins of G. lamblia in their predicted fourth repeat and predicted to be localized on the opposite (concave) surface of the molecule became apparent. Western blots of trophozoite fractions probed with antiserum against the recombinant protein indicated that this annexin, like the other giardial annexins ANX19 and ANX20, associates with phospholipids in the presence of Ca(2+). Finally, confocal laser scanning of trophozoites showed that the protein, apart from the median body, was exclusively localized in the eight flagella. Together, these data suggest that ANX21 may function as a Ca(2+)-regulated structural element linking phospholipid bilayer and underlying axoneme.

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Crossref · 10.1074/jbc.m203260200

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  • Intact AB loops are unusual in alpha-giardins, with examples found only in alpha-14 giardin.

    “Intact AB loops are unusual in alpha-giardins, with examples found only in alpha-14 giardin (17).”

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Authors
Szkodowska, A., Müller, M. C. M., Linke, C., & Scholze, H.
Affiliations
Osnabrück University (DE)
Corresponding author
Scholze, Henning
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2002-07
Volume
277
Issue
28
Pages
25703-25706
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1995083961
Cited by
19
References
30
Citations by year
2026: 2 · 2025: 1 · 2022: 1 · 2020: 1 · 2019: 1 · 2016: 1 · 2013: 1
FWCI
0.23
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › S100 Proteins and Annexins
  • Life Sciences › Immunology and Microbiology › Parasitology › Parasitic Infections and Diagnostics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
Giardia lamblia, annexins, trophozoites, flagella, sequence motifs, calcium regulation, phospholipid binding, axoneme, protein localization
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, Escherichia coli, Flagella, Models, Molecular, Molecular Sequence Data, Phospholipids, Recombinant Proteins, Protozoan Proteins, Giardia lamblia, Annexins, Sequence Homology, Amino Acid, DNA Primers

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