The continuing development of efficient high-performance liquid chromatography (HPLC) protocols is critical for all areas of biomedical science and biotechnology. The four major areas under investigation in our laboratory are: (1) development of novel HPLC and capillary electrophoresis (CE) separation methods for peptides and proteins; (2) utility of reversed-phase chromatography (RPC) to monitor folding and stability of peptides and proteins; (3) to correlate peptide elution behavior in RPC and hydrophilic interaction/cationexchange chromatography (HILIC/CEC) with biological activity; and (4) development of automated two dimensional HPLC for peptides and proteins in proteomics applications. There is an ever-increasing demand for efficient analytical and preparative purification techniques for peptides and proteins. Thus, HPLC is used routinely in our laboratory for purification of native proteins and protein fragments, recombinant proteins and synthetic peptides, the latter of which are a class of compounds with increasing therapeutic importance. Novel purification protocols, such as mixed-mode HILIC/CEC with the development of volatile mobile phases, will continue to rival RPC. A generally applicable one-step RPC protocol for recombinant proteins from whole cell lysates will represent a considerable advance on existing multi-step approaches. Also, our novel sample displacement chromatography (SDC) approach, when scaled down to microbore and capillary RPC columns, will allow efficient purification of even limited amounts (0.5 mg to 10 mg) of crude synthetic peptides. Both RPC and HILIC/CEC represent potent monitors of polypeptide structural characteristics and it will be possible to correlate elution behavior with amphipathicity and hydrophilicity/hydrophobicity of antimicrobial alpha-helical and beta-sheet peptides for SAR (structure activity relationships) studies. Thus, we are showing the advantages of HPLC in the understanding of the action of peptide antimicrobial mechanisms, a vital link in the de novo design and development of novel antibiotics as a response to the increasing bacterial resistance to traditional antibiotics. The overall aim of proteomics is the systematic identification and quantification of all proteins expressed by an organism at a certain time and under certain conditions. Proteomics is a multidisciplinary research activity wherein separation science (including multidimensional HPLC and CE) and mass spectrometry will continue to play pivotal roles.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM061855-08
Application #
7254136
Study Section
Special Emphasis Panel (ZRG1-BECM (01))
Program Officer
Edmonds, Charles G
Project Start
2000-07-01
Project End
2009-06-30
Budget Start
2007-07-01
Budget End
2009-06-30
Support Year
8
Fiscal Year
2007
Total Cost
$339,921
Indirect Cost
Name
University of Colorado Denver
Department
Biochemistry
Type
Schools of Medicine
DUNS #
041096314
City
Aurora
State
CO
Country
United States
Zip Code
80045
Abraham, Thomas; Prenner, Elmar J; Lewis, Ruthven N A H et al. (2014) Structure-activity relationships of the antimicrobial peptide gramicidin S and its analogs: aqueous solubility, self-association, conformation, antimicrobial activity and interaction with model lipid membranes. Biochim Biophys Acta 1838:1420-9
Huang, Yibing; Pan, Ling; Zhao, Lianjing et al. (2014) Structure-guided RP-HPLC chromatography of diastereomeric ?-helical peptide analogs substituted with single amino acid stereoisomers. Biomed Chromatogr 28:511-7
Mant, Colin T; Jiang, Ziqing; Boyes, Barry E et al. (2013) An improved approach to hydrophilic interaction chromatography of peptides: salt gradients in the presence of high isocratic acetonitrile concentrations. J Chromatogr A 1277:15-25
Mant, Colin T; Hodges, Robert S (2012) Design of peptide standards with the same composition and minimal sequence variation to monitor performance/selectivity of reversed-phase matrices. J Chromatogr A 1230:30-40
Mant, Colin T; Cepeniene, Dziuleta; Hodges, Robert S (2010) Reversed-phase HPLC of peptides: Assessing column and solvent selectivity on standard, polar-embedded and polar endcapped columns. J Sep Sci 33:3005-21
Kirwan, J Paul; Hodges, Robert S (2010) Critical interactions in the stability control region of tropomyosin. J Struct Biol 170:294-306
Hodges, Robert S; Mills, Janine; McReynolds, Susanna et al. (2009) Identification of a unique ""stability control region"" that controls protein stability of tropomyosin: A two-stranded alpha-helical coiled-coil. J Mol Biol 392:747-62
Mant, Colin T; Kovacs, James M; Kim, Hyun-Min et al. (2009) Intrinsic amino acid side-chain hydrophilicity/hydrophobicity coefficients determined by reversed-phase high-performance liquid chromatography of model peptides: comparison with other hydrophilicity/hydrophobicity scales. Biopolymers 92:573-95
Jiang, Ziqing; Vasil, Adriana I; Hale, John D et al. (2008) Effects of net charge and the number of positively charged residues on the biological activity of amphipathic alpha-helical cationic antimicrobial peptides. Biopolymers 90:369-83
Mant, Colin T; Hodges, Robert S (2008) Mixed-mode hydrophilic interaction/cation-exchange chromatography: separation of complex mixtures of peptides of varying charge and hydrophobicity. J Sep Sci 31:1573-84

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