Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum.

Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum. Research Abstract Details 

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Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum. Abstract Text:

N Kadota,A Suzuki,Y Nakagami,T Izumi,T Endo,

Meltrin alpha (ADAM12) is a member of the ADAM (MDC) protein family characterized by the presence of metalloprotease and disintegrin domains. ADAM proteins contain single transmembrane domains, and the processed mature proteins are postulated to span the plasma membrane. It has been reported that transfection of a truncated meltrin alpha cDNA lacking the prodomain and metalloprotease domain promotes skeletal muscle cell fusion. We show here that meltrin alpha was constitutively expressed in both undifferentiated and differentiated C2 skeletal muscle cells and also in fibroblasts. Both its precursor and processed mature forms were present in these cells. Thus, meltrin alpha may play general roles in addition to its roles in myogenesis. Since endogenous meltrin alpha cannot be detected by immunofluorescence microscopy, we examined the location of the exogenously expressed protein by transfection. Unexpectedly, the exogenously expressed meltrin alpha was located to a network structure of the endoplasmic reticulum (ER) but not to the plasma membrane. Cell fractionation revealed that the intrinsic mature protein was associated with the plasma membrane. However, the exogenously expressed protein remained unprocessed. These results seem to imply that the exogenously expressed meltrin alpha is not translocated from the ER to the trans-Golgi network, where a processing enzyme resides, and that it is consequently not converted to the mature form. Thus, the transfected meltrin alpha is unlikely to exert its physiological functions. Conversely, the ER may serve as a reservoir of the latent form of intrinsic meltrin alpha.

Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum. Publishing Authors By Initials

N Kadota,A Suzuki,Y Nakagami,T Izumi,T Endo,

For similar proteins: contractile proteins: muscle proteins research abstracts see: proteins: contractile proteins: muscle proteins research

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Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of biochemistry

VOLUME: 128

Page Numbers: 941-9

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Dec

YEAR: 2000

Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum. Information

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LANGUAGE: eng

NlmUniqueID: 376600

Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum. Keywords Mesh Terms:

KEYWORDS: Muscle Proteins

MESH TERMS: metabolism

Chemical & Substance for Abstract: Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum. Information

Substance Name: ADAM Proteins

Registry Number: EC 3.4.24.-

Grant and Affiliation Information for Endogenous meltrin alpha is ubiquitously expressed and associated with the plasma membrane but exogenous meltrin alpha is retained in the endoplasmic reticulum.

AFFILIATION: Department of Biology, Faculty of Science, Chiba University, Yayoicho, Inage-ku, Chiba, Chiba 263-8522, Japan.

Country: Japan

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MEDLINETA: J Biochem

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