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2015 ; 10
(7
): e0133141
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English Wikipedia
Cholesterol Interaction with the MAGUK Protein Family Member, MPP1, via CRAC and
CRAC-Like Motifs: An In Silico Docking Analysis
#MMPMID26186446
Listowski MA
; Leluk J
; Kraszewski S
; Sikorski AF
PLoS One
2015[]; 10
(7
): e0133141
PMID26186446
show ga
Cholesterol is essential for the proper organization of the biological membrane.
Therefore, predicting which proteins can bind cholesterol is important in
understanding how proteins participate in lateral membrane organization. In this
study, a simple bioinformatics approach was used to establish whether MPP1, a
member of the MAGUK protein family, is capable of binding cholesterol. Modelled
and experimentally-validated fragment structures were mined from online resources
and searched for CRAC and CRAC-like motifs. Several of these motifs were found in
the primary structure of MPP1, and these were structurally visualized to see
whether they localized to the protein surface. Since all of the CRAC and
CRAC-like motifs were found at the surface of MPP1 domains, in silico docking
experiments were performed to assess the possibility of interaction between CRAC
motifs and cholesterol. The results obtained show that MPP1 can bind cholesterol
via CRAC and CRAC-like motifs with moderate to high affinity (KI in the nano- to
micro-molar range). It was also found that palmitoylation-mimicking mutations
(C/F or C/M) did not affect the affinity of MPP1 towards cholesterol. Data
presented here may help to understand at least one of the molecular mechanisms
via which MPP1 affects lateral organization of the membrane.