The Reaction Specificities of the Thylakoidal Processing Peptidase and Escherichia Coli Leader Peptidase Are Identical
Overview
Molecular Biology
Affiliations
Proteins which are transported across the bacterial plasma membrane, endoplasmic reticulum and thylakoid membrane are usually synthesized as larger precursors containing amino-terminal targeting signals. Removal of the signals is carried out by specific, membrane-bound processing peptidases. In this report we show that the reaction specificities of these three peptidases are essentially identical. Precursors of two higher plant thylakoid lumen proteins are efficiently processed by purified Escherichia coli leader peptidase. Processing of one precursor, that of the 23 kd photosystem II protein, by both the thylakoidal and E. coli enzymes generates the correct mature amino terminus. Similarly, leader (signal) peptides of both eukaryotic and prokaryotic origin are cleaved by partially purified thylakoidal processing peptidase. No evidence of incorrect processing was obtained. Both leader peptidase and thylakoidal peptidase are inhibited by a synthetic leader peptide.
Functional diversification of thylakoidal processing peptidases in Arabidopsis thaliana.
Hsu S, Endow J, Ruppel N, Roston R, Baldwin A, Inoue K PLoS One. 2011; 6(11):e27258.
PMID: 22087276 PMC: 3210150. DOI: 10.1371/journal.pone.0027258.
Keep the balloon deflated: the significance of protein maturation for thylakoid flattening.
Endow J, Ruppel N, Inoue K Plant Signal Behav. 2010; 5(6):721-3.
PMID: 21135574 PMC: 3001570. DOI: 10.4161/psb.5.6.11662.
Shipman-Roston R, Ruppel N, Damoc C, Phinney B, Inoue K Plant Physiol. 2010; 152(3):1297-308.
PMID: 20097790 PMC: 2832241. DOI: 10.1104/pp.109.151977.
Interactions that drive Sec-dependent bacterial protein transport.
Rusch S, Kendall D Biochemistry. 2007; 46(34):9665-73.
PMID: 17676771 PMC: 2675607. DOI: 10.1021/bi7010064.
Purification and Characterization of a Membrane-Bound Protease from Chlamydomonas reinhardtii.
Hoober J, Hughes M Plant Physiol. 1992; 99(3):932-7.
PMID: 16669021 PMC: 1080566. DOI: 10.1104/pp.99.3.932.