By Professor Saul B. Needleman (auth.)

Confusion now hath made his masterpiece Macbeth II iii seventy two Whence and what are these execrable form? Paradise misplaced Ib 1 681 Confusion worse confounded Paradise misplaced Ib 1 995 whilst the manuscript for the 1st a part of this e-book was once proposed, it was once expected that the dialogue of the full box of protein se­ quencing should be coated in one quantity - from purification and characterization of the protein via fragmentation by means of chemical or enzymic capability and, ultimately, to reassembly of the pointed out person peptides into the reconstructed overall series. It quickly turned obtrusive that this is able to no longer be attainable. whereas the rationale used to be to limit the divulge of strategies basically to that details all in favour of "hands on" rainy chemistry, it grew to become obvious thorough presentation will require, furthermore, a dialogue of yes instrumental and extra theoretical ways now not integrated within the first quantity. additionally, the complete realizing of the sphere of protein sequencing has complex substantially because the inception of this publication. the aim of the 1st quantity was once to supply functional info in adequate aspect to allow the researcher to adopt the particular sequencing strategies in his personal laboratory.

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Some of the largest peptides have N-terminal glutamine, which can be expected to cyclize to pyroglutamic acid, thus making Edman degradation impossible. Nevertheless some C-terminal sequence data can be obtained using the strategy outlined. Alternatively one may be able to deblock the N-terminal using pyroglutaminase (123). A third example is provided by lobster glyceraldehyde-3-phosphate dehydrogenase, a 333-residue protein containing 10 methionine residues (Fig. 18). Since the N-terminal of the protein is acetylated (105), sequencing of the intact protein is precluded.

2 Accordingly, we have searched for a simple method 2 Since our original report describing this enzyme (120), we have responded to more than a hundred requests for the bacterial strain, dried bacteria, purified enzyme, and/or suitable PCA-peptides for substrates. More than half of these shipments were made on dry ice. Several of these ended unhappily when the package was allowed to sit in post offices or delivery rooms for inordinate periods. 50 >- ~ 100 Fig:. 3. J 80 « 60 a:: 40 ~ ~ 0 21-23°) 0 0 ~ :z w u 20 CL 0 a:: w 0 4 8 12 16 20 24 28 TIME (days) of stabilizing enzyme preparations for shipping at ambient temperatures In this regard, we now prepare ammonium sulfate slurries (containing 2-pyrrolidone) which can be mailed in an ordinary manner, since the activity is reasonably preserved at room temperatures for several weeks (Fig.

II a sample of the peptide is cleaved with trypsin, and the C-terminal segment is selectively attached and sequenced. III a sample of the peptides is cleaved at arginine and is selectively attached and sequenced in length from 10 to 30 residues, can be sequenced either in a single run or by using the strategy for residues 57-121. The examples above also illustrate one of the pitfalls encountered in sequencing. Some of the largest peptides have N-terminal glutamine, which can be expected to cyclize to pyroglutamic acid, thus making Edman degradation impossible.

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