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2017 ; 4
(ä): 17
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Electron Microscopy Structural Insights into CPAP Oligomeric Behavior: A
Plausible Assembly Process of a Supramolecular Scaffold of the Centrosome
#MMPMID28396859
Alvarez-Cabrera AL
; Delgado S
; Gil-Carton D
; Mortuza GB
; Montoya G
; Sorzano CO
; Tang TK
; Carazo JM
Front Mol Biosci
2017[]; 4
(ä): 17
PMID28396859
show ga
Centrosomal P4.1-associated protein (CPAP) is a cell cycle regulated protein
fundamental for centrosome assembly and centriole elongation. In humans, the
region between residues 897-1338 of CPAP mediates interactions with other
proteins and includes a homodimerization domain. CPAP mutations cause primary
autosomal recessive microcephaly and Seckel syndrome. Despite of the
biological/clinical relevance of CPAP, its mechanistic behavior remains unclear
and its C-terminus (the G-box/TCP domain) is the only part whose structure has
been solved. This situation is perhaps due in part to the challenges that
represent obtaining the protein in a soluble, homogeneous state for structural
studies. Our work constitutes a systematic structural analysis on multiple
oligomers of HsCPAP(897)(-1338), using single-particle electron microscopy (EM)
of negatively stained (NS) samples. Based on image classification into clearly
different regular 3D maps (putatively corresponding to dimers and tetramers) and
direct observation of individual images representing other complexes of
HsCPAP(897-1338) (i.e., putative flexible monomers and higher-order multimers),
we report a dynamic oligomeric behavior of this protein, where different
homo-oligomers coexist in variable proportions. We propose that dimerization of
the putative homodimer forms a putative tetramer which could be the structural
unit for the scaffold that either tethers the pericentriolar material to
centrioles or promotes procentriole elongation. A coarse fitting of atomic models
into the NS 3D maps at resolutions around 20 Å is performed only to complement
our experimental data, allowing us to hypothesize on the oligomeric composition
of the different complexes. In this way, the current EM work represents an
initial step toward the structural characterization of different oligomers of
CPAP, suggesting further insights to understand how this protein works,
contributing to the elucidation of control mechanisms for centriole biogenesis.