Abstract
Mammalian aminoacyl-tRNA synthetases are often found in several different molecular weight forms in the same extract, although the structural basis for this diversity is not clear. In this report, we describe the separation of high and low molecular weight forms of rat liver arginyl-tRNA synthetase, and the extensive purification to near homogeneity of the low molecular weight form of the enzyme, free of other aminoacyl-tRNA synthetases. The purified enzyme catalyses the incorporation into tRNA of 9,500 nmol of arginine/min/mg of protein under optimal assay conditions, corresponding to a turnover number of approximately 550 min-1. The molecular weight of the native enzyme was calculated to be approximately 59,000 based on a sedimentation coefficient of about 3.6 S and a Stokes radius of 39 A. The subunit molecular weight based on sodium dodecyl sulfate-acrylamide gel electrophoresis was also about 60,000, indicating that the enzyme is a monomer. The relation of this form of arginyl-tRNA synthetase to the high molecular weight form and its possible origin are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 6003-6006 |
| Number of pages | 4 |
| Journal | Journal of Biological Chemistry |
| Volume | 257 |
| Issue number | 11 |
| State | Published - Jun 10 1982 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Biochemistry
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Purification of a low molecular weight form of rat liver arginyl-tRNA synthetase. / Deutscher, Murray P; Ni, R. C.
In: Journal of Biological Chemistry, Vol. 257, No. 11, 10.06.1982, p. 6003-6006.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Purification of a low molecular weight form of rat liver arginyl-tRNA synthetase.
AU - Deutscher, Murray P
AU - Ni, R. C.
PY - 1982/6/10
Y1 - 1982/6/10
N2 - Mammalian aminoacyl-tRNA synthetases are often found in several different molecular weight forms in the same extract, although the structural basis for this diversity is not clear. In this report, we describe the separation of high and low molecular weight forms of rat liver arginyl-tRNA synthetase, and the extensive purification to near homogeneity of the low molecular weight form of the enzyme, free of other aminoacyl-tRNA synthetases. The purified enzyme catalyses the incorporation into tRNA of 9,500 nmol of arginine/min/mg of protein under optimal assay conditions, corresponding to a turnover number of approximately 550 min-1. The molecular weight of the native enzyme was calculated to be approximately 59,000 based on a sedimentation coefficient of about 3.6 S and a Stokes radius of 39 A. The subunit molecular weight based on sodium dodecyl sulfate-acrylamide gel electrophoresis was also about 60,000, indicating that the enzyme is a monomer. The relation of this form of arginyl-tRNA synthetase to the high molecular weight form and its possible origin are discussed.
AB - Mammalian aminoacyl-tRNA synthetases are often found in several different molecular weight forms in the same extract, although the structural basis for this diversity is not clear. In this report, we describe the separation of high and low molecular weight forms of rat liver arginyl-tRNA synthetase, and the extensive purification to near homogeneity of the low molecular weight form of the enzyme, free of other aminoacyl-tRNA synthetases. The purified enzyme catalyses the incorporation into tRNA of 9,500 nmol of arginine/min/mg of protein under optimal assay conditions, corresponding to a turnover number of approximately 550 min-1. The molecular weight of the native enzyme was calculated to be approximately 59,000 based on a sedimentation coefficient of about 3.6 S and a Stokes radius of 39 A. The subunit molecular weight based on sodium dodecyl sulfate-acrylamide gel electrophoresis was also about 60,000, indicating that the enzyme is a monomer. The relation of this form of arginyl-tRNA synthetase to the high molecular weight form and its possible origin are discussed.
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M3 - Article
C2 - 7076660
AN - SCOPUS:0020479074
VL - 257
SP - 6003
EP - 6006
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 11
ER -