Catalysis, subcellular localization, expression and evolution of the targeting peptides degrading protease, AtPreP2.
We have previously identified a zinc metalloprotease involved in the degradation of mitochondrial and chloroplast targeting peptides, the presequence protease (PreP). In the Arabidopsis thaliana genomic database, there are two genes that correspond to the protease, the zinc metalloprotease (AAL90904) and the putative zinc metalloprotease (AAG13049). We have named the corresponding proteins AtPreP1 and AtPreP2, respectively. AtPreP1 and AtPreP2 show significant differences in their targeting peptides and the proteins are predicted to be localized in different compartments. AtPreP1 was shown to degrade both mitochondrial and chloroplast targeting peptides and to be dual targeted to both organelles using an ambiguous targeting peptide. Here, we have overexpressed, purified and characterized proteolytic and targeting properties of AtPreP2. AtPreP2 exhibits different proteolytic subsite specificity from AtPreP1 when used for degradation of organellar targeting peptides and their mutants. Interestingly, AtPreP2 precursor protein was also found to be dual targeted to both mitochondria and chloroplasts in a single and dual in vitro import system. Furthermore, targeting peptide of the AtPreP2 dually targeted green fluorescent protein (GFP) to both mitochondria and chloroplasts in tobacco protoplasts and leaves using an in vivo transient expression system. The targeting of both AtPreP1 and AtPreP2 proteases to chloroplasts in A. thaliana in vivo was confirmed via a shotgun mass spectrometric analysis of highly purified chloroplasts. Reverse transcription-polymerase chain reaction (RT-PCR) analysis revealed that AtPreP1 and AtPreP2 are differentially expressed in mature A. thaliana plants. Phylogenetic evidence indicated that AtPreP1 and AtPreP2 are recent gene duplicates that may have diverged through subfunctionalization.
Bhushan
Shashi
S
Department of Biochemistry and Biophysics, Arrhenius Laboratories for Natural Sciences, Stockholm University, 10691 Stockholm, Sweden.
Ståhl
Annelie
A
Nilsson
Stefan
S
Lefebvre
Benoit
B
Seki
Motoaki
M
Roth
Christian
C
McWilliam
David
D
Wright
Sarah J
SJ
Liberles
David A
DA
Shinozaki
Kazuo
K
Bruce
Barry D
BD
Boutry
Marc
M
Glaser
Elzbieta
E
D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000201:enzymology* / Q000235:genetics*; D001483:Base Sequence; D001693:Biological Transport, Active; D002384:Catalysis; D002736:Chloroplasts / Q000201:enzymology; D018076:DNA, Complementary / Q000235:genetics; D018744:DNA, Plant / Q000235:genetics; D019143:Evolution, Molecular; D015870:Gene Expression; D017343:Genes, Plant; D013058:Mass Spectrometry; D045726:Metalloproteases / Q000235:genetics* / Q000378:metabolism*; D008928:Mitochondria / Q000201:enzymology; D008969:Molecular Sequence Data; D010455:Peptides / Q000737:chemistry; D030821:Plants, Genetically Modified; D013347:Subcellular Fractions / Q000201:enzymology; D013379:Substrate Specificity; D014026:Nicotiana / Q000201:enzymology / Q000235:genetics
D018076:DNA, Complementary; D018744:DNA, Plant; D010455:Peptides; D045726:Metalloproteases