Amino acid sequence of a new 2S albumin from Ricinus communis which is part of a 29-kDa precursor protein

Amino acid sequence of a new 2S albumin from Ricinus communis which is part of a 29-kDa precursor protein

Author Silva, J. G. Google Scholar
Machado, OLT Google Scholar
Izumi, C. Google Scholar
Padovan, Julio Cesar Autor UNIFESP Google Scholar
Chait, B. T. Google Scholar
Mirza, U. A. Google Scholar
Greene, Lewis Joel Autor UNIFESP Google Scholar
Institution Universidade de São Paulo (USP)
Universidade Federal do Rio de Janeiro (UFRJ)
UNIV FED RURAL RIO DE JANEIRO
Universidade Federal de São Paulo (UNIFESP)
ROCKEFELLER UNIV
Abstract The isolation and sequence determination of a new 2S albumin storage protein from Ricinus communis seeds denoted 2S ASP-Ib are described, The fragment approach using selective enzymatic cleavage, Edman degradation, and mass spectrometry was used to demonstrate that the 11-kDa heterodimer protein linked by disulfide bridges has the following structure: short chain, GEREGSSSQQCRQEVQRKDLSSCERYLRQSSS; long chain, <QQQESQQLQQCCNQVKQVRDECQCEAIKYIAEDQIQQGQLHGEESERVAQRAGEIVSSCGVRCMR. The molecular weight of the intact protein, 11,140 +/- 2, determined by matrix-assisted laser desorption mass spectrometry was consistent with the assigned structure, The S- and L-chains are identical to residues 18-49 and 66-130 of the precursor protein predicted by S., D., Irwin, J, N, Keen, J,B. C, Findlay, and J,M, Lord [(1990) Mel. Gen. Genet. 222, 400-408], on the basis of the structure of a cDNA isolated using probes based on the sequence of another 2S albumin, described by F, S., Sharief and S, S, L, Li [(1982) J. Biol. Chem. 257, 14753-14759], which we denote 2S ASP-Ia, Three of the four termini could have been produced by post-translational processing by endopeptidase(s) and carboxypeptidase(s) which utilized basic residues as the cleavage sites. Mass spectrometric evidence suggested that the protein presented microheterogeneity at its termini, i,e,, truncated forms presumably due to processing heterogeneity, The present characterization of the 2S ASP-Ib protein, the second 2S albumin from Ricinus communis seeds, demonstrates that the 237-residue precursor protein codes for two different heterodimer proteins containing 97 and 99 residues each, This system should be useful for studying the posttranslational processing of plant storage proteins. (C) 1996 Academic Press, Inc.
Keywords 2S albumin
Ricinus communis
storage protein
posttranslational processing
precursor protein
2S ASP-Ia
2S ASP-Ib
Language English
Date 1996-12-01
Published in Archives Of Biochemistry And Biophysics. San Diego: Academic Press Inc Jnl-comp Subscriptions, v. 336, n. 1, p. 10-18, 1996.
ISSN 0003-9861 (Sherpa/Romeo, impact factor)
Publisher Academic Press Inc Jnl-comp Subscriptions
Extent 10-18
Origin http://dx.doi.org/10.1006/abbi.1996.0526
Access rights Closed access
Type Article
Web of Science ID WOS:A1996VW84800002
URI http://repositorio.unifesp.br/11600/42640

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