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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
(23
): 16085-99
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TMTC1 and TMTC2 are novel endoplasmic reticulum tetratricopeptide
repeat-containing adapter proteins involved in calcium homeostasis
#MMPMID24764305
Sunryd JC
; Cheon B
; Graham JB
; Giorda KM
; Fissore RA
; Hebert DN
J Biol Chem
2014[Jun]; 289
(23
): 16085-99
PMID24764305
show ga
The endoplasmic reticulum (ER) is organized in part by adapter proteins that
nucleate the formation of large protein complexes. Tetratricopeptide repeats
(TPR) are well studied protein structural motifs that support intermolecular
protein-protein interactions. TMTC1 and TMTC2 were identified by an in silico
search as TPR-containing proteins possessing N-terminal ER targeting signal
sequences and multiple hydrophobic segments, suggestive of polytopic membrane
proteins that are targeted to the secretory pathway. A variety of cell biological
and biochemical assays was employed to demonstrate that TMTC1 and TMTC2 are both
ER resident integral membrane proteins with multiple clusters of TPR domains
oriented within the ER lumen. Proteomic analysis followed by
co-immunoprecipitation verification found that both proteins associated with the
ER calcium uptake pump SERCA2B, and TMTC2 also bound to the carbohydrate-binding
chaperone calnexin. Live cell calcium measurements revealed that overexpression
of either TMTC1 or TMTC2 caused a reduction of calcium released from the ER
following stimulation, whereas the knockdown of TMTC1 or TMTC2 increased the
stimulated calcium released. Together, these results implicate TMTC1 and TMTC2 as
ER proteins involved in ER calcium homeostasis.