Distinct Subcellular Localization of Transiently Expressed Types 1 and 2 Iodothyronine Deiodinases as Determined by Immunofluorescence Confocal Microscopy

We compared the subcellular localization of FLAG-epitope tagged Types 1 and 2 deiodinases (D1 and D2) transiently expressed in human embryonic kidney (HEK-293) and mouse neuroblastoma (NB2A) cells. D2 is an integral membrane protein based on resistance to extraction at pH 11 with the NH2 terminus in...

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Bibliographic Details
Published in:Endocrinology (Philadelphia) 2000-11, Vol.141 (11), p.4309-4312
Main Authors: Baqui, Munira M. A, Gereben, Balazs, Harney, John W, Larsen, P. Reed, Bianco, Antonio C
Format: Article
Language:English
Subjects:
Amino acid sequence
BiP protein
Confocal microscopy
D2 protein
Differential distribution
Endoplasmic reticulum
Epitopes
Flags
Immunofluorescence
Localization
Microscopy
Neuroblastoma
Protein transport
Proteins
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Summary:We compared the subcellular localization of FLAG-epitope tagged Types 1 and 2 deiodinases (D1 and D2) transiently expressed in human embryonic kidney (HEK-293) and mouse neuroblastoma (NB2A) cells. D2 is an integral membrane protein based on resistance to extraction at pH 11 with the NH2 terminus in the endoplasmic reticulum (ER). Immunofluorescence confocal microscopy using anti-FLAG and anti-GRP78/BiP antibodies showed the FLAG-D1 signal was found in the periphery of the cells and not co-localized with the ER specific marker GRP78/BiP. On the other hand, FLAG-D2 protein was found in the ER co-localized with the GRP78/BiP protein. These differential distribution patterns indicate subcellular sorting of D1 and D2 is determined by intrinsic protein sequence and can explain the ready access of D2-generated T3 to the nucleus.
ISSN:0013-7227
1945-7170
DOI:10.1210/endo.141.11.7872