Abstract

Beta-aspartic acid (b-Asp) and gamma-glutamic acid (g-Glu) residues are amino acid residues in which the peptide bond is formed through the carboxylic acid group on the side chain rather than at the alpha carbon (normal). The form of aspartic acid (normal-Asp vs. b-Asp) in a peptide can greatly affect the activity of the peptide; likewise, the form of glutamic acid (normal-Glu vs. G-Glu) affects the peptide activity. We can identify the type of aspartic acid or glutamic acid linkage present by using analysis by MALDI-PSD of the TMPP-Ac-derivatives. The mass spectrum of the peptide containing a side chain-linked residue (b-Asp or g-Glu) had a b-type ion peak that was more intense than the corresponding b-type ion peak in the spectrum of the peptide containing the normal residue (Asp or Glu). Experiments with paired isomers of model peptides are being studied in an effort to establish useful protocols for identification of unknowns.

  Funding Agency

Agency
National Institute of Health (NIH)
Institute
National Center for Research Resources (NCRR)
Type
Biotechnology Resource Grants (P41)
Project #
3P41RR000480-28S1
Application #
6258783
Study Section
Project Start
1997-06-01
Project End
1999-11-30
Budget Start
1998-10-01
Budget End
1999-09-30
Support Year
28
Fiscal Year
1999
Total Cost
Indirect Cost

  Institution

Name
Michigan State University
Department
Type
DUNS #
193247145
City
East Lansing
State
MI
Country
United States
Zip Code
48824

  Publications

Peri, S P; Bhadti, V S; Somerville-Armstrong, K S et al. (1999) Affinity reagents for cross-linking hemoglobin: bis(phenoxycarbonylethyl)phosphinic acid (BPCEP) and bis(3-nitrophenoxycarbonylethyl)phosphinic acid (BNCEP). Hemoglobin 23:1-20
Chen, H M; Sood, R; Hosmane, R S (1999) An efficient, short synthesis and potent anti-hepatitis B viral activity of a novel ring-expanded purine nucleoside analogue containing a 5:7-fused, planar, aromatic, imidazo[4,5-e][1,3]diazepine ring system. Nucleosides Nucleotides 18:331-5
Bretner, M; Beckett, T D; Sood, R K et al. (1999) Substrate/inhibition studies of bacteriophage T7 RNA polymerase with the 5'-triphosphate derivative of a ring-expanded ('fat') nucleoside possessing potent antiviral and anticancer activities. Bioorg Med Chem 7:2931-6
Agasimundin, Y S; Mumper, M W; Hosmane, R S (1998) Inhibitors of glycogen phosphorylase b: synthesis, biochemical screening, and molecular modeling studies of novel analogues of hydantocidin. Bioorg Med Chem 6:911-23
Hosmane, R S; Peri, S P; Bhadti, V S et al. (1998) Bis[2-(4-carboxyphenoxy)carbonylethyl]phosphinic acid (BCCEP): a novel affinity reagent for the beta-cleft modification of human hemoglobin. Bioorg Med Chem 6:767-83
Rajappan, V P; Hosmane, R S (1998) Analogues of azepinomycin as inhibitors of guanase. Nucleosides Nucleotides 17:1141-51
Hosmane, R S; Hong, M (1997) How important is the N-3 sugar moiety in the tight-binding interaction of coformycin with adenosine deaminase? Biochem Biophys Res Commun 236:88-93
Lopez-Lara, I M; Orgambide, G; Dazzo, F B et al. (1993) Characterization and symbiotic importance of acidic extracellular polysaccharides of Rhizobium sp. strain GRH2 isolated from acacia nodules. J Bacteriol 175:2826-32
Watson, J T; Kayganich, K (1989) Novel sample preparation for analysis by electron capture negative ionization mass spectrometry. Biochem Soc Trans 17:254-7
Kassel, D B; Kayganich, K A; Watson, J T et al. (1988) Utility of ion source pretreatment with chlorine-containing compounds for enhanced performance in gas chromatography/negative ionization mass spectrometry. Anal Chem 60:911-7

Showing the most recent 10 out of 11 publications