Linked Life Data

14593099

Source:http://linkedlifedata.com/resource/pubmed/id/14593099

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2004-1-19
pubmed:abstractText
Aquaporin-2 (AQP2) is a pore-forming protein that is required for regulated reabsorption of water from urine. Mutations in AQP2 lead to nephrogenic diabetes insipidus, a disorder in which functional AQP2 is not expressed on the apical cell surface of kidney collecting duct principal cells. The mechanisms and pathways directing AQP2 from the endoplasmic reticulum to the Golgi complex and beyond have not been defined. We found that approximately 25% of newly synthesized AQP2 is glycosylated. Nonglycosylated and complex-glycosylated wild-type AQP2 are stable proteins with a half-life of 6-12 h and are both detectable on the cell surface. We show that AQP2 forms tetramers in the endoplasmic reticulum during or very early after synthesis and reaches the Golgi complex in 1-1.5 h. We also report that glycosylation is neither essential for tetramerization nor for transport from the endoplasmic reticulum to the Golgi complex. Instead, the N-linked glycan is important for exit from the Golgi complex and sorting of AQP2 to the plasma membrane. These results are important for understanding the molecular mechanisms responsible for the intracellular retention of AQP2 in nephrogenic diabetes insipidus.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
23
pubmed:volume
279
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
2975-83
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Glycosylation is important for cell surface expression of the water channel aquaporin-2 but is not essential for tetramerization in the endoplasmic reticulum.
pubmed:affiliation
Department of Cell Biology, University Medical Center Utrecht, Utrecht 3584 CX, The Netherlands.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't