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- W2023642213 abstract "We have reinvestigated the molecular weight and subunit composition of calf thymus ribonuclease H1. Earlier studies suggested a variety of molecular weights for the enzyme in the range of 64K-84K and reported that the enzyme either was a single polypeptide of 74 kDa or consisted of from two to four subunits in the range of 21-34 kDa. Although we too find bands in this lower molecular weight range in our highly purified preparations following SDS-PAGE, our data suggest that the native structure of RNase H1 is a dimer of 68-kDa subunits. The evidence includes the following: (1) Western blot analysis of fractions taken at various stages of the purification indicates that the predominant antigenic form of the enzyme in crude extracts has a molecular weight of 68K but that during purification in the absence of sufficient protease inhibitors a variety of lower molecular weight forms appear concomitant with the disappearance of the 68-kDa band. (2) Activity gel analysis of the highly purified enzyme prepared in the presence of a battery of protease inhibitors reveals that the 68-kDa band (as well as several bands of lower molecular weight) possesses RNase H activity. (3) The 68-kDa band recognized by Western blotting with anti-RNase H immune sera is not detected by using preimmune sera. Furthermore, when immune sera are used, a trace of a 140-150-kDa antigenic form can sometimes be detected, consistent with the existence of a dimeric form of the enzyme.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
- W2023642213 created "2016-06-24" @default.
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- W2023642213 date "1990-01-16" @default.
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- W2023642213 title "On the molecular weight and subunit composition of calf thymus ribonuclease H1" @default.
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- W2023642213 doi "https://doi.org/10.1021/bi00454a012" @default.
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