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@ARTICLE{Simon:856430,
author = {Simon, Paul and Grüner, Daniel and Worch, Hartmut and
Pompe, Wolfgang and Lichte, Hannes and El Khassawna, Thaqif
and Heiss, Christian and Wenisch, Sabine and Kniep,
Rüdiger},
title = {{F}irst {E}vidence of {O}ctacalcium
{P}hosphate@{O}steocalcin {N}anocomplex as {S}keletal {B}one
{C}omponent {D}irecting {C}ollagen {T}riple–{H}elix
{N}anofibril {M}ineralization},
journal = {Scientific reports},
volume = {8},
number = {1},
issn = {2045-2322},
address = {[London]},
publisher = {Macmillan Publishers Limited, part of Springer Nature},
reportid = {FZJ-2018-05829},
pages = {13696},
year = {2018},
abstract = {Tibia trabeculae and vertebrae of rats as well as human
femur were investigated by high-resolution TEM at the atomic
scale in order to reveal snapshots of the morphogenetic
processes of local bone ultrastructure formation. By taking
into account reflections of hydroxyapatite for Fourier
filtering the appearance of individual alpha–chains within
the triple–helix clearly shows that bone bears the feature
of an intergrowth composite structure extending from the
atomic to the nanoscale, thus representing a molecular
composite of collagen and apatite. Careful Fourier analysis
reveals that the non–collagenous protein osteocalcin is
present directly combined with octacalcium phosphate.
Besides single spherical specimen of about 2 nm in
diameter, osteocalcin is spread between and over collagen
fibrils and is often observed as pearl necklace strings. In
high-resolution TEM, the three binding sites of the
γ-carboxylated glutamic acid groups of the mineralized
osteocalcin were successfully imaged, which provide the
chemical binding to octacalcium phosphate. Osteocalcin is
attached to the collagen structure and interacts with the
Ca–sites on the (100) dominated hydroxyapatite platelets
with Ca-Ca distances of about 9.5 Å. Thus, osteocalcin
takes on the functions of Ca–ion transport and suppression
of hydroxyapatite expansion.},
cin = {IEK-2},
ddc = {600},
cid = {I:(DE-Juel1)IEK-2-20101013},
pnm = {111 - Efficient and Flexible Power Plants (POF3-111)},
pid = {G:(DE-HGF)POF3-111},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:30209287},
UT = {WOS:000444377500016},
doi = {10.1038/s41598-018-31983-5},
url = {https://juser.fz-juelich.de/record/856430},
}