Ca2+-dependent deimination-induced disassembly of intermediate filaments involves specific modification of the amino-terminal head domain.
Peptidylarginine deiminase (proteinarginine iminohydrolase, EC 3.5.3.15) converted some arginine residues to citrulline residues in soluble vimentin, in a micromolar Ca2+-dependent manner and resulted in the loss of polymerization competence of the intermediate filament protein. When about 8 mol of residues/mol of vimentin were deiminated, there was a complete loss of filament forming ability. This enzyme also deiminated vimentin filaments which had been polymerized, and deimination of vimentin filaments resulted in filament disassembly. Similar results were obtained with other intermediate filaments such as desmin and glial filaments. High performance liquid chromatography and amino acid analyses of lysine-specific protease-generated fragments from deiminated vimentin (about 8 mol of citrulline/mol of vimentin) showed a differential deimination of three structural domains. The head domain was predominant. These observations suggest that the head domain strongly influences integrity of the intermediate filament.
Inagaki
M
M
Laboratory of Experimental Radiology, Aichi Cancer Center Research Institute, Japan.
Takahara
H
H
Nishi
Y
Y
Sugawara
K
K
Sato
C
C
D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002118:Calcium / Q000494:pharmacology*; D002851:Chromatography, High Pressure Liquid; D006867:Hydrolases / Q000378:metabolism*; D007381:Intermediate Filament Proteins / Q000302:isolation & purification / Q000378:metabolism*; D007700:Kinetics; D051379:Mice; D008854:Microscopy, Electron; D009132:Muscles / Q000201:enzymology*; D010446:Peptide Fragments / Q000302:isolation & purification; D010766:Phosphorylation; D011493:Protein Kinase C / Q000378:metabolism; D011494:Protein Kinases / Q000378:metabolism; D000080002:Protein-Arginine Deiminase Type 4; D000076342:Protein-Arginine Deiminases; D014746:Vimentin / Q000378:metabolism* / Q000648:ultrastructure
D000596:Amino Acids; D007381:Intermediate Filament Proteins; D010446:Peptide Fragments; D014746:Vimentin; D011494:Protein Kinases; D011493:Protein Kinase C; D006867:Hydrolases; D000080002:Protein-Arginine Deiminase Type 4; D000076342:Protein-Arginine Deiminases; C552151:peptidylarginine deiminase 4, mouse; D002118:Calcium