title: On-line separation of native proteins by two-dimensional liquid chromatography using a single column.
abstract: This paper reports the on-line separation of native (N) proteins by two-dimensional liquid chromatography (2D-LC) using a single column with one phase (called 2D column). The 2D column exhibits excellent resolution, selectivity, and retention of proteins in the N state and functions in two retention modes--hydrophobic interaction chromatography (HIC) and weak-cation exchange chromatography (WCX). We describe a new approach to on-line buffer exchange and collection of fractions from the first retention mode and their quantitative re-injection into the same column, followed by re-separation in the second retention mode. Thus, liquid chromatography in a closed system and in an on-line manner could be successfully carried out. This method was termed on-line protein separation by 2D-LC using only a single column (on-line 2D-LC-1C). The applicability of this method was experimentally demonstrated using standard proteins and a human serum sample. The total hypothetical maximum possible peak capacity n(c,total) and total sample peak capacity n(c,total)(*) of the 2D column were 329 and 199, respectively. By comparison against several popular commercially available columns, it was found that the 2D column had not only comparable resolution and better selectivity but also some unique characteristics. This 2D-LC-1C method could be applied to the fast purification of intact proteins in the N state, such protein drugs from natural products, and recombinant proteins and also for the fast pre-fractionation of intact proteins in the "top-down" MS strategy in proteomics.
authors.affiliation: Institute of Modern Separation Science, Northwest University, Shaanxi Key Laboratory of Modern Separation Science, Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Xi'an, China. xdgeng@nwu.edu.cn
authors.forename: Xindu
authors.initials: X
authors.lastname: Geng
authors.forename: Congyu
authors.initials: C
authors.lastname: Ke
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.forename: Huiqiang
authors.initials: H
authors.lastname: Zhang
authors.forename: Xuan
authors.initials: X
authors.lastname: Sun
mesh_terms: D000818:Animals; D002021:Buffers; D002412:Cations; D002852:Chromatography, Ion Exchange; D002853:Chromatography, Liquid / Q000295:instrumentation / Q000379:methods*; D057927:Hydrophobic and Hydrophilic Interactions; D009113:Muramidase / Q000302:isolation & purification; D009862:Online Systems; D011506:Proteins / Q000302:isolation & purification*; D012015:Reference Standards
chemical_list: D002021:Buffers; D002412:Cations; D011506:Proteins; D009113:Muramidase