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Characterization of tryptic fragments of human complement factor C3

Eggertsen, G.; Hellman, U.; Lundwall, Åke LU ; Folkersen, J. and Sjöquist, J. (1985) In Mol Immunol 22(8). p.41-833
Abstract
C3c and C3d fragments were prepared in pure form from trypsin-digested human C3, and the individual chains of tryptic C3c were isolated by gel filtration on Sepharose 4B in 6M guanidinium hydrochloride. No low mol. wt (Mr) fragments were identified. The polypeptide chains were characterized with regard to Mr, amino acid composition and N-terminal amino acid sequence. Tryptic C3c consisted of one fragment from the beta-chain (Mr 64,000) and two from the alpha'-chain (Mr 40,000 and 23,000). The beta-chain fragment was derived from the C-terminal part of the chain, and the 23,000-Mr component constituted the amino terminal end of the alpha-chain. The 40,000-Mr fragment emanated from the C-terminal end of the alpha-chain. Tryptic C3d displayed... (More)
C3c and C3d fragments were prepared in pure form from trypsin-digested human C3, and the individual chains of tryptic C3c were isolated by gel filtration on Sepharose 4B in 6M guanidinium hydrochloride. No low mol. wt (Mr) fragments were identified. The polypeptide chains were characterized with regard to Mr, amino acid composition and N-terminal amino acid sequence. Tryptic C3c consisted of one fragment from the beta-chain (Mr 64,000) and two from the alpha'-chain (Mr 40,000 and 23,000). The beta-chain fragment was derived from the C-terminal part of the chain, and the 23,000-Mr component constituted the amino terminal end of the alpha-chain. The 40,000-Mr fragment emanated from the C-terminal end of the alpha-chain. Tryptic C3d displayed microheterogeneity on polyacrylamide gel electrophoresis in sodium dodecyl sulfate, but possessed a homogeneous N-terminal, identical to that described by Tack et al. (1980) (Proc. natn. Acad. Sci. U.S.A. 77, 5764-5768). By utilization of antisera against subunits of C3 and C3c in immunoblotting a degradation scheme for C3 by trypsin was proposed and the positions of the fragments in the intact molecule indicated. (Less)
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author
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keywords
Polyacrylamide Gel, Electrophoresis, Complement C3d, Complement C3c, *Complement C3/immunology/isolation & purification, Agarose, Chromatography, Chemistry, Carbohydrates/analysis, Amino Acid Sequence, Amino Acids/analysis, Humans, Immunodiffusion, *Peptide Fragments/isolation & purification, Research Support, Non-U.S. Gov't, Trypsin
in
Mol Immunol
volume
22
issue
8
pages
41 - 833
external identifiers
  • Scopus:0021933672
language
English
LU publication?
no
id
9894a878-c599-494f-9637-2056a464feb4 (old id 3965091)
alternative location
http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=3930949
date added to LUP
2013-08-11 15:02:43
date last changed
2016-06-29 08:58:57
@misc{9894a878-c599-494f-9637-2056a464feb4,
  abstract     = {C3c and C3d fragments were prepared in pure form from trypsin-digested human C3, and the individual chains of tryptic C3c were isolated by gel filtration on Sepharose 4B in 6M guanidinium hydrochloride. No low mol. wt (Mr) fragments were identified. The polypeptide chains were characterized with regard to Mr, amino acid composition and N-terminal amino acid sequence. Tryptic C3c consisted of one fragment from the beta-chain (Mr 64,000) and two from the alpha'-chain (Mr 40,000 and 23,000). The beta-chain fragment was derived from the C-terminal part of the chain, and the 23,000-Mr component constituted the amino terminal end of the alpha-chain. The 40,000-Mr fragment emanated from the C-terminal end of the alpha-chain. Tryptic C3d displayed microheterogeneity on polyacrylamide gel electrophoresis in sodium dodecyl sulfate, but possessed a homogeneous N-terminal, identical to that described by Tack et al. (1980) (Proc. natn. Acad. Sci. U.S.A. 77, 5764-5768). By utilization of antisera against subunits of C3 and C3c in immunoblotting a degradation scheme for C3 by trypsin was proposed and the positions of the fragments in the intact molecule indicated.},
  author       = {Eggertsen, G. and Hellman, U. and Lundwall, Åke and Folkersen, J. and Sjöquist, J.},
  keyword      = {Polyacrylamide Gel,Electrophoresis,Complement C3d,Complement C3c,*Complement C3/immunology/isolation & purification,Agarose,Chromatography,Chemistry,Carbohydrates/analysis,Amino Acid Sequence,Amino Acids/analysis,Humans,Immunodiffusion,*Peptide Fragments/isolation & purification,Research Support,Non-U.S. Gov't,Trypsin},
  language     = {eng},
  number       = {8},
  pages        = {41--833},
  series       = {Mol Immunol},
  title        = {Characterization of tryptic fragments of human complement factor C3},
  volume       = {22},
  year         = {1985},
}