Inter-molecular degradation of signal peptidase I in vitro
Abstract
Highly purified preparations of signal peptidase I (36 kDa) were found to undergo an apparent inter-autocatalytic degradation at 4°C and 37° C. The disappearance of the 36 kDa protein coincided with the stable appearance of a 31 kDa and a 5 kDa species. Amino-terminal sequencing of the 31 kDa product indicated a site specific cleavage following Ala38-Gln-Ala of signal peptidase I. The 31 kDa fragment was purified and shown to have 100-fold less activity than the native enzyme, with pre-maltose binding protein as a substrate.
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267920
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0x95644003c57E6F55A65596E3D9Eac6813e3566dA
Article ID:
267920
Unique Identifier:
10.1016/0006-291x(91)91240-d
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Scimatic Chain (ID: 481)
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