Abstract
THE weakest point in the DNP-method1 is the destruction of the N-terminal DNP-amino-acid which occurs under the conditions of hydrolysis necessary to detach it from the protein. The optimum time of hydrolysis for an end-group analysis is the time at which DNP-peptides are no longer present; this is different with every protein, but overnight hydrolysis (16–24 h) with constant boiling HCl is routine. The extent of destruction is different with each protein, and is generally much greater than would be expected for any free DNP-amino-acid under the same conditions of hydrolysis in the absence of protein. It is not possible to correct for destruction by hydrolysis for a graded series of times and extrapolation to zero time, for much of the destruction seems to take place during the initial hours of the hydrolysis before degradation has proceeded to small fragments. Thus, although the DNP-method has been, and will doubtless continue to be, widely used for end-group analysis, it is slowly being superseded by stepwise degradation methods.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Sanger, F., Biochem. J., 39, 507 (1945).
Signor, A., Scoffone, E., Biondi, L., and Bezzi, S., Gazz. Chim. Ital., 93, 65 (1963).
Talik, Z., and Plazek, E., Rec. Trav. Chim., 78, 193 (1960).
Knott, E. B., J. Chem. Soc., 1360 (1956).
Paul, M. A., and Long, F. A., Chemical Reviews, 57, 1 (1957).
Levy, A. L., Nature, 174, 126 (1954).
Signor, A., Biondi, L., Terbojevich, M., and Pajetta, P., Gazz. Chim. Ital., 94, 619 (1964).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
SIGNOR, A., PREVIERO, A. & TERBOJEVICH, M. Determination of the N-terminal Amino-acid in Polypeptides and Proteins. Nature 205, 596–597 (1965). https://doi.org/10.1038/205596a0
Issue Date:
DOI: https://doi.org/10.1038/205596a0
This article is cited by
-
Chiroptical probes for configurational analysis of α-amino acids
Experientia (1972)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.