Peptide analysis by mass spectrometry achieved 90% sequence coverage.
Briefly, using computational design, we identified a 9mer peptide, with 8 total amino acid flanking regions, that by, peptide binding analysis software (MHCPred and netMHC), was predicted to have a higher binding constant than the invariant peptide CLIP for the peptide-binding groove of known MHCII alleles.
The signal peptide analysis was done by SignalP software [ 43] and trans-membrane domain analysis was done with TMHMM program [ 44].
We confirmed that recombinant SIK2 phosphorylates a single site on Sakamototide (Ser) and HDAC5tide (Ser), using [γ-P]ATP-labelled peptides followed by analysis with Edman sequencing (results not shown).
Length of stay was correlated by univariate analysis, but not by multivariate analysis, with C-peptide and glycemic control at 24 hours, insulin resistance, and severity of illness scores.
Peptide identification was accomplished by MS/MS analysis with an iontrap mass spectrometer (XCT-Ultra, Agilent) equipped with an orthogonal nanospray ion source.
The peptide was finally characterized by amino acid analysis with a Beckman 6300 analyzer and by MALDI-TOF with a Bruker model Biflex III.
After incubation with the AKIP 1A, the peptide array was analyzed by Western blot analysis with polyclonal rabbit AKIP1 antibody generated previously (11).
A total of 23 different known protein species were isolated and characterized by analysis with MALDI-TOF-MS peptide mass fingerprinting (PMF).
Previously, several proteins were recognized by immunoblot analysis with a Humanin polyclonal antibody PO4 (raised against the entire Humanin peptide).
