Activity of the plant peptide aglycin in mammalian systems.
A 37 residue peptide, aglycin, has been purified from porcine intestine. The sequence is identical to that of residues 27-63 of plant albumin 1 B precursor (PA1B, chain b) from pea seeds. Aglycin resists in vitro proteolysis by pepsin, trypsin and Glu-C protease, compatible with its intestinal occurrence and an exogenous origin from plant food. When subcutaneously injected into mice (at 10 microg.g(-1) body weight), aglycin has a hyperglycemic effect resulting in a doubling of the blood glucose level within 60 min. Using surface plasmon resonance biosensor technology, an aglycin binding protein with an apparent molecular mass of 34 kDa was detected in membrane protein extracts from porcine and mice pancreas. The polypeptide was purified by affinity chromatography and identified through peptide mass fingerprinting as the voltage-dependent anion-selective channel protein 1. The results indicate that aglycin has the potential to interfere with mammalian physiology.
Dun
Xin-Peng
XP
School of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, China.
Wang
Jian-He
JH
Chen
Lei
L
Lu
Jie
J
Li
Fa-Fang
FF
Zhao
Yan-Ying
YY
Cederlund
Ella
E
Bryzgalova
Galina
G
Efendic
Suad
S
Jörnvall
Hans
H
Chen
Zheng-Wang
ZW
Bergman
Tomas
T
D000818:Animals; D001786:Blood Glucose / Q000032:analysis*; D002846:Chromatography, Affinity; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D051379:Mice; D008970:Molecular Weight; D010179:Pancreas / Q000737:chemistry; D018532:Pisum sativum / Q000737:chemistry; D010449:Peptide Mapping; D010455:Peptides / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D010940:Plant Proteins / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology; D011485:Protein Binding; D020033:Protein Isoforms / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D020349:Surface Plasmon Resonance / Q000379:methods; D013552:Swine; D050995:Voltage-Dependent Anion Channel 1 / Q000378:metabolism
D001786:Blood Glucose; D010455:Peptides; D010940:Plant Proteins; D020033:Protein Isoforms; D050995:Voltage-Dependent Anion Channel 1