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Signal peptidases and signal peptide hydrolases.

Abstract：

:Signal peptidases, the endoproteases that remove the amino-terminal signal sequence from many secretory proteins, have been isolated from various sources. Seven signal peptidases have been purified, two from E. coli, two from mammalian sources, and three from mitochondrial matrix. The mitochondrial enzymes are soluble and function as a heterogeneous dimer. The mammalian enzymes are isolated as a complex and share a common glycosylated subunit. The bacterial enzymes are isolated as monomers and show no sequence homology with each other or the mammalian enzymes. The membrane-bound enzymes seem to require a substrate containing a consensus sequence following the -3, -1 rule of von Heijne at the cleavage site; however, processing of the substrate is strongly influenced by the hydrophobic region of the signal peptide. The enzymes appear to recognize an unknown three-dimensional motif rather than a specific amino acid sequence around the cleavage site. The matrix mitochondrial enzymes are metallo-endopeptidases; however, the other signal peptidases may belong to a unique class of proteases as they are resistant to chelators and most protease inhibitors. There are no data concerning the substrate binding site of these enzymes. In vivo, the signal peptide is rapidly degraded. Three different enzymes in Escherichia coli that can degrade a signal peptide in vitro have been identified. The intact signal peptide is not accumulated in mutants lacking these enzymes, which suggests that these peptidases individually are not responsible for the degradation of an intact signal peptide in vivo. It is speculated that signal peptidases and signal peptide hydrolases are integral components of the secretory pathway and that inhibition of the terminal steps can block translocation.

journal_name

J Bioenerg Biomembr

journal_title

Journal of bioenergetics and biomembranes

authors

Dev IK,Ray PH

doi

10.1007/BF00763168

subject

Has Abstract

pub_date

1990-06-01 00:00:00

pages

271-90

issue

3

eissn

0145-479X

issn

1573-6881

journal_volume

22

pub_type

杂志文章,评审

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