ECB-ART-42472
Curr Protein Pept Sci
2012 Sep 01;136:524-46. doi: 10.2174/138920312803582951.
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The eukaryotic flagellum makes the day: novel and unforeseen roles uncovered after post-genomics and proteomics data.
Diniz MC
,
Pacheco AC
,
Farias KM
,
de Oliveira DM
.
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This review will summarize and discuss the current biological understanding of the motile eukaryotic flagellum, as posed out by recent advances enabled by post-genomics and proteomics approaches. The organelle, which is crucial for motility, survival, differentiation, reproduction, division and feeding, among other activities, of many eukaryotes, is a great example of a natural nanomachine assembled mostly by proteins (around 350-650 of them) that have been conserved throughout eukaryotic evolution. Flagellar proteins are discussed in terms of their arrangement on to the axoneme, the canonical "9+2" microtubule pattern, and also motor and sensorial elements that have been detected by recent proteomic analyses in organisms such as Chlamydomonas reinhardtii, sea urchin, and trypanosomatids. Such findings can be remarkably matched up to important discoveries in vertebrate and mammalian types as diverse as sperm cells, ciliated kidney epithelia, respiratory and oviductal cilia, and neuro-epithelia, among others. Here we will focus on some exciting work regarding eukaryotic flagellar proteins, particularly using the flagellar proteome of C. reinhardtii as a reference map for exploring motility in function, dysfunction and pathogenic flagellates. The reference map for the eukaryotic flagellar proteome consists of 652 proteins that include known structural and intraflagellar transport (IFT) proteins, less wellcharacterized signal transduction proteins and flagellar associated proteins (FAPs), besides almost two hundred unannotated conserved proteins, which lately have been the subject of intense investigation and of our present examination.
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Genes referenced: dnah3 ift52 irak1bp1 LOC100887844 LOC115919910 LOC576114 LOC583386
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Fig. (1). (A) Atomic force microscopy (AFM) contact mode image of an isolated promastigote form of Leishmania chagasi showing its elongated cell body with a single flagellum in surface topography. (B) Contact mode 3D view. | |
Fig. (3). Three-dimensional structures of the first intraflagellar transport (IFT) proteins deposited at Protein Data Bank (PDB). The Chlamydomonas reinhardtii IFT complex 25/27 can be seen on panels A (PDB ID 2CY2) and B (2CY4) [110]. Images are viewed after PDB access modifications made in RCSB PDB Protein Worshop 3.9®. | |
Fig. (4). Three-dimensional structure of cofilin. A) A 3D model of Leishmania infantum cofilin after B) the PDB template 1QVP_A. A significantly well conserved display of secondary and tertiary structural features can be seen and easily correlated to the average 37% overall similarity between the two primary sequences. Both cofilins have a central mixed β-sheet, which is sandwiched between two pairs of α- helices. The highly conserved residues said to be important for protein stability and correct folding (Tyr64, Trp88, Pro90, and Tyr101, with the exception of Phe85) are present in all Leishmania cofilin sequences and shown in L. infantum modeled cofilin. |
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