In addition, the use of the instrument for top-down sequencing of proteins was explored since this instrument offers particular advantages to this approach.
Top-down sequencing was performed on different proteins, including commercially available proteins and biologically derived samples such as the human E2 ubiquitin conjugating enzyme, UbCH10.
Peak 4 was very weak to be purified and analysed by top-down sequencing.
The fragments in each peak were partially purified by HPLC, and their terminal sequences were determined using top-down sequencing analysis by MALDI TOF-MS.
The above discussion is limited to top-down sequencing of proteins lacking modified residues, but does our line of reasoning also hold true for EDD of posttranslationally modified proteins?
Electron transfer dissociation can then be used for top-down sequencing [138,139] of the intact protein to reveal site-specific information about the location of exposed side-chains.
Furthermore, the crustacean hyperglycemia hormones (CHHs, 8.5 kDa) were isolated from the American lobster Homarus americanus and identified by integration of MS-based bottom-up and top-down sequencing approaches.
However, both the N-terminal (Glu Asn) and the C-terminal (Tyr Gln) sequences of the fragment in peak 5 were successfully detected by top-down sequencing and were shown to be identical to those of apoA-I cleaved at the carboxyl side of Phe [Δ 1-33)apoA-I] (results not shown).
The top-down sequence of variables corresponds to the sequence that was indicated by the forward selection procedure.
The top-down sequence is province level, prefectural level, county level, township level and village level [ 13].
In China, there is a hierarchical administrative health network, the top-down sequence is province level, prefectural level, county level, township level, village level [ 9].
