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Immunolocalization of the saposin-like insert of plant aspartic proteinases exhibiting saposin C activity. Expression in young flower tissues and in barley seeds

Brodelius, M; Hiraiwa, M; Marttila, S; Al-Karadaghi, Salam LU ; Picaud, S and Brodelius, P E (2005) In Physiologia Plantarum 125(4). p.405-418
Abstract
The plant- specific insert ( PSI) of cypro11 gene- encoding cyprosin, an aspartic proteinase from Cynara cardunculus, has been cloned by polymerase chain reaction ( PCR) into a bacterial expression vector. A rearranged form of this PSI in which the N- and C- terminal sequences were permutated to make it more similar to the structural arrangement observed in saposins was also cloned and expressed in the same system. The biological activities of the two purified recombinant proteins were compared to those of human saposins B and C. The proteins showed similar activity to saposin C, i. e. capacity to activate human glucosylceramidase. At a concentration of 5 mu M, wild- type PSI, saposin C, and rearranged PSI activated human... (More)
The plant- specific insert ( PSI) of cypro11 gene- encoding cyprosin, an aspartic proteinase from Cynara cardunculus, has been cloned by polymerase chain reaction ( PCR) into a bacterial expression vector. A rearranged form of this PSI in which the N- and C- terminal sequences were permutated to make it more similar to the structural arrangement observed in saposins was also cloned and expressed in the same system. The biological activities of the two purified recombinant proteins were compared to those of human saposins B and C. The proteins showed similar activity to saposin C, i. e. capacity to activate human glucosylceramidase. At a concentration of 5 mu M, wild- type PSI, saposin C, and rearranged PSI activated human glucosylceramidase two-, three-, and five- fold, respectively. The K-m for 4- methylumbelliferyl beta-glucopyranoside was around 7 mM in the presence of any of the three activators ( 5 mM). The neurotropic activity using NS20Y cells and lipid- binding properties of the plant recombinant proteins were tested. The two plant proteins showed lipid- binding properties similar to those of saposins but did not have any effect on neurite outgrowth. Immunolocalization of PSI showed its expression in protective tissues in flower meristem - protodermis, in C. cardunculus and embryonic root cap and coleorhiza in mature barley grains - as well as husk, pericarp, and the aleurone layer. Possible biological functions suggested for the plant homologue to saposins besides the general activation of enzymes involved in lipid metabolism would be involvement in plant defence. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physiologia Plantarum
volume
125
issue
4
pages
405 - 418
publisher
Wiley Online Library
external identifiers
  • wos:000233407900002
  • scopus:28444442762
ISSN
0031-9317
DOI
10.1111/j.1399-3054.2005.00576.x
language
English
LU publication?
yes
id
7af08281-5c5b-495f-ab7a-d3eda45b6960 (old id 152228)
date added to LUP
2007-07-09 14:47:00
date last changed
2017-01-01 07:06:51
@article{7af08281-5c5b-495f-ab7a-d3eda45b6960,
  abstract     = {The plant- specific insert ( PSI) of cypro11 gene- encoding cyprosin, an aspartic proteinase from Cynara cardunculus, has been cloned by polymerase chain reaction ( PCR) into a bacterial expression vector. A rearranged form of this PSI in which the N- and C- terminal sequences were permutated to make it more similar to the structural arrangement observed in saposins was also cloned and expressed in the same system. The biological activities of the two purified recombinant proteins were compared to those of human saposins B and C. The proteins showed similar activity to saposin C, i. e. capacity to activate human glucosylceramidase. At a concentration of 5 mu M, wild- type PSI, saposin C, and rearranged PSI activated human glucosylceramidase two-, three-, and five- fold, respectively. The K-m for 4- methylumbelliferyl beta-glucopyranoside was around 7 mM in the presence of any of the three activators ( 5 mM). The neurotropic activity using NS20Y cells and lipid- binding properties of the plant recombinant proteins were tested. The two plant proteins showed lipid- binding properties similar to those of saposins but did not have any effect on neurite outgrowth. Immunolocalization of PSI showed its expression in protective tissues in flower meristem - protodermis, in C. cardunculus and embryonic root cap and coleorhiza in mature barley grains - as well as husk, pericarp, and the aleurone layer. Possible biological functions suggested for the plant homologue to saposins besides the general activation of enzymes involved in lipid metabolism would be involvement in plant defence.},
  author       = {Brodelius, M and Hiraiwa, M and Marttila, S and Al-Karadaghi, Salam and Picaud, S and Brodelius, P E},
  issn         = {0031-9317},
  language     = {eng},
  number       = {4},
  pages        = {405--418},
  publisher    = {Wiley Online Library},
  series       = {Physiologia Plantarum},
  title        = {Immunolocalization of the saposin-like insert of plant aspartic proteinases exhibiting saposin C activity. Expression in young flower tissues and in barley seeds},
  url          = {http://dx.doi.org/10.1111/j.1399-3054.2005.00576.x},
  volume       = {125},
  year         = {2005},
}