Cloning and Sequence Analysis of a Signal Peptidase I from the Thermophilic Cyanobacterium Phormidium Laminosum

Overview

Journal Plant Mol Biol

Date 1995 Jan 1

PMID 7865790

Citations 4

Authors

J C Packer

D Andre

C J Howe

Affiliations

Soon will be listed here.

Abstract

Type I signal peptidases are a widespread family of enzymes which remove the presequences from proteins translocated across cell membranes, including thylakoid and cytoplasmic membranes of cyanobacteria and thylakoid membranes of chloroplasts. We have cloned and sequenced a signal peptidase gene from the thermophilic cyanobacterium Phormidium laminosum which is believed to encode an enzyme common to both membrane systems. The deduced amino acid sequence is 203 residues long and although the overall similarity among signal peptidases is rather low there are a number of identifiable conserved regions present. The P. laminosum enzyme is predicted to have a single transmembrane domain, in contrast to other Gram-negative bacterial sequences, but similar to other type I signal peptidases.

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