scholarly journals Expression of the coiled coil domain containing protein 116 in the pancreatic islets and endocrine pancreatic tumors

Islets ◽  
2012 ◽  
Vol 4 (5) ◽  
pp. 349-353 ◽  
Author(s):  
Apostolos V. Tsolakis ◽  
Lars Grimelius ◽  
Md. Shahidul Islam
Keyword(s):  
Pancreatic Islets ◽  
Coiled Coil ◽  
Pancreatic Tumors ◽  
Endocrine Pancreatic Tumors ◽  
Coiled Coil Domain

scholarly journals Transthyretin immunoreactivity in human and porcine liver, choroid plexus, and pancreatic islets.

1989 ◽  
Vol 37 (1) ◽  
pp. 31-37 ◽  
Author(s):  
B Jacobsson ◽  
V P Collins ◽  
L Grimelius ◽  
T Pettersson ◽  
B Sandstedt ◽  
...  
Keyword(s):  
Pancreatic Islets ◽  
Choroid Plexus ◽  
Sodium Acetate ◽  
Pancreatic Tumors ◽  
Immunoreactive Insulin ◽  
Dot Blot ◽  
Porcine Liver ◽  
Porcine Pancreas ◽  
Endocrine Pancreatic Tumors ◽  
Insulin Cells

We examined transthyretin immunoreactivity (TTR-IR) in human and porcine liver, choroid plexus, and pancreatic islets with both polyclonal and monoclonal antibodies to TTR. The specificity of the immunoreactions and the effects of various fixatives were tested in immunohistochemical and dot-blot systems. B-5 fixative (mercuric chloride and sodium acetate in formalin) was the best immunopreservative. In both species, the TTR-IR in choroid plexus epithelial cells was strong and was much greater than that in hepatocytes. Glucagon cells in pancreatic islets were also strongly TTR immunoreactive. Insulin cells were slightly TTR immunoreactive in human but strongly so in porcine pancreas. The finding of TTR-IR in normal islets explains the presence of TTR-IR in human endocrine pancreatic tumors, notably glucagonomas and malignant insulinomas.

TMCC3 localizes at the three-way junctions for the proper tubular network of the endoplasmic reticulum

2019 ◽  
Vol 476 (21) ◽  
pp. 3241-3260
Author(s):  
Sindhu Wisesa ◽  
Yasunori Yamamoto ◽  
Toshiaki Sakisaka
Keyword(s):  
Endoplasmic Reticulum ◽  
Membrane Proteins ◽  
Membrane Protein ◽  
Mammalian Cells ◽  
Coiled Coil ◽  
Transmembrane Domains ◽  
Domain Family ◽  
Coiled Coil Domain ◽  
U2os Cells ◽  
Er Membrane

The tubular network of the endoplasmic reticulum (ER) is formed by connecting ER tubules through three-way junctions. Two classes of the conserved ER membrane proteins, atlastins and lunapark, have been shown to reside at the three-way junctions so far and be involved in the generation and stabilization of the three-way junctions. In this study, we report TMCC3 (transmembrane and coiled-coil domain family 3), a member of the TEX28 family, as another ER membrane protein that resides at the three-way junctions in mammalian cells. When the TEX28 family members were transfected into U2OS cells, TMCC3 specifically localized at the three-way junctions in the peripheral ER. TMCC3 bound to atlastins through the C-terminal transmembrane domains. A TMCC3 mutant lacking the N-terminal coiled-coil domain abolished localization to the three-way junctions, suggesting that TMCC3 localized independently of binding to atlastins. TMCC3 knockdown caused a decrease in the number of three-way junctions and expansion of ER sheets, leading to a reduction of the tubular ER network in U2OS cells. The TMCC3 knockdown phenotype was partially rescued by the overexpression of atlastin-2, suggesting that TMCC3 knockdown would decrease the activity of atlastins. These results indicate that TMCC3 localizes at the three-way junctions for the proper tubular ER network.

scholarly journals The git5 Gβ and git11 Gγ Form an Atypical Gβγ Dimer Acting in the Fission Yeast Glucose/cAMP Pathway

Genetics ◽  
2001 ◽  
Vol 157 (3) ◽  
pp. 1159-1168 ◽  
Author(s):  
Sheila Landry ◽  
Charles S Hoffman
Keyword(s):  
Fission Yeast ◽  
Mammalian Cells ◽  
Glucose Repression ◽  
Coiled Coil ◽  
Carboxy Terminus ◽  
Amino Terminal ◽  
Camp Pathway ◽  
Coiled Coil Domain ◽  
Mutational Activation ◽  
Two Hybrid

AbstractFission yeast adenylate cyclase, like mammalian adenylate cyclases, is regulated by a heterotrimeric G protein. The gpa2 Gα and git5 Gβ are both required for glucose-triggered cAMP signaling. The git5 Gβ is a unique member of the Gβ family in that it lacks an amino-terminal coiled-coil domain shown to be essential for mammalian Gβ folding and interaction with Gγ subunits. Using a git5 bait in a two-hybrid screen, we identified the git11 Gγ gene. Co-immunoprecipitation studies confirm the composition of this Gβγ dimer. Cells deleted for git11 are defective in glucose repression of both fbp1 transcription and sexual development, resembling cells lacking either the gpa2 Gα or the git5 Gβ. Overexpression of the gpa2 Gα partially suppresses loss of either the git5 Gβ or the git11 Gγ, while mutational activation of the Gα fully suppresses loss of either Gβ or Gγ. Deletion of gpa2 (Gα), git5 (Gβ), or git11 (Gγ) confer quantitatively distinct effects on fbp1 repression, indicating that the gpa2 Gα subunit remains partially active in the absence of the Gβγ dimer and that the git5 Gβ subunit remains partially active in the absence of the git11 Gγ subunit. The addition of the CAAX box from the git11 Gγ to the carboxy-terminus of the git5 Gβ partially suppresses the loss of the Gγ. Thus the Gγ in this system is presumably required for localization of the Gβγ dimer but not for folding of the Gβ subunit. In mammalian cells, the essential roles of the Gβ amino-terminal coiled-coil domains and Gγ partners in Gβ folding may therefore reflect a mechanism used by cells that express multiple forms of both Gβ and Gγ subunits to regulate the composition and activity of its G proteins.

A Stutter in the Coiled-Coil Domain of Escherichia coli Co-chaperone GrpE Connects Structure with Function

Biochemistry ◽  
2021 ◽  
Author(s):  
Tulsi Upadhyay ◽  
Upasana S. Potteth ◽  
Vaibhav V. Karekar ◽  
Ishu Saraogi
Keyword(s):  
Escherichia Coli ◽  
Coiled Coil ◽  
Coiled Coil Domain

Lamellipodial localization ofDictyosteliummyosin heavy chain kinase A is mediated via F-actin binding by the coiled-coil domain

FEBS Letters ◽  
2002 ◽  
Vol 516 (1-3) ◽  
pp. 58-62 ◽  
Author(s):  
Paul A Steimle ◽  
Lucila Licate ◽  
Graham P Côté ◽  
Thomas T Egelhoff
Keyword(s):  
Heavy Chain ◽  
Coiled Coil ◽  
Actin Binding ◽  
Coiled Coil Domain ◽  
Kinase A

scholarly journals Oligomeric and Thermal Stability of TRPA1 Coiled-Coil Domain by Polyphosphates

2017 ◽  
Vol 112 (3) ◽  
pp. 113a
Author(s):  
Gilbert Q. Martinez ◽  
Luke D. Cody ◽  
Sharona E. Gordon
Keyword(s):  
Thermal Stability ◽  
Coiled Coil ◽  
Coiled Coil Domain ◽  
Thermal Stability Of

Ionic Interactions in the Coiled-coil Domain of Laminin Determine the Specificity of Chain Assembly

1993 ◽  
Vol 231 (2) ◽  
pp. 311-323 ◽  
Author(s):  
Konrad Beck ◽  
Tony W. Dixon ◽  
Jürgen Engel ◽  
David A.D. Parry
Keyword(s):  
Coiled Coil ◽  
Ionic Interactions ◽  
Coiled Coil Domain

Parallelin Vivoandin VitroDetection of Functional Somatostatin Receptors in Human Endocrine Pancreatic Tumors: Consequences with Regard to Diagnosis, Localization, and Therapy

1990 ◽  
Vol 71 (3) ◽  
pp. 566-574 ◽  
Author(s):  
STEVEN W. J. LAMBERTS ◽  
LEO J. HOFLAND ◽  
PETER M. VAN KOETSVELD ◽  
JEAN-CLAUDE REUBI ◽  
HAJO A. BRUINING ◽  
...  
Keyword(s):  
Somatostatin Receptors ◽  
Pancreatic Tumors ◽  
Endocrine Pancreatic Tumors
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