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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2014 ; 289
(26
): 18189-201
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A substrate preference for the rough endoplasmic reticulum resident protein
FKBP22 during collagen biosynthesis
#MMPMID24821723
Ishikawa Y
; Bächinger HP
J Biol Chem
2014[Jun]; 289
(26
): 18189-201
PMID24821723
show ga
The biosynthesis of collagens occurs in the rough endoplasmic reticulum and
requires a large numbers of molecular chaperones, foldases, and
post-translational modification enzymes. Collagens contain a large number of
proline residues that are post-translationally modified to 3-hydroxyproline or
4-hydroxyproline, and the rate-limiting step in formation of the triple helix is
the cis-trans isomerization of peptidyl-proline bonds. This step is catalyzed by
peptidyl-prolyl cis-trans isomerases. There are seven peptidyl-prolyl cis-trans
isomerases in the rER, and so far, two of these enzymes, cyclophilin B and
FKBP65, have been shown to be involved in collagen biosynthesis. The absence of
either cyclophilin B or FKBP65 leads to a recessive form of osteogenesis
imperfecta. The absence of FKBP22 leads to a kyphoscoliotic type of Ehlers-Danlos
syndrome (EDS), and this type of EDS is classified as EDS type VI, which can also
be caused by a deficiency in lysyl-hydroxylase 1. However, the lack of FKBP22
shows a wider spectrum of clinical phenotypes than the absence of
lysyl-hydroxylase 1 and additionally includes myopathy, hearing loss, and aortic
rupture. Here we show that FKBP22 catalyzes the folding of type III collagen and
interacts with type III collagen, type VI collagen, and type X collagen, but not
with type I collagen, type II collagen, or type V collagen. These restrictive
interactions might help explain the broader phenotype observed in patients that
lack FKBP22.