Property and Application of BACy-Based Functional Hydrogels
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1 Property and Application of BACy-Based Functional Hydrogels 以二 ( 丙烯醯基 ) 胱胺為基質之功能性水膠的性質與應用 * 林宴夙 1 林照雄 2 李文福 1 1 大同大學化學工程系 2 國立陽明大學生命科學系暨基因體科學研究所 wflee@ttu.edu.tw Abstract Conventional polyacrylamide hydrogels prepared from radical polymerization between acrylamide and N,N'-methylenebisacrylamide (NMBA) have been frequently used in the biochemical technique like the sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) to separate proteins. In this study, we have prepared an alternative polyacrylamide hydrogel from the crosslinking of acrylamide and N,N'-bisacrylylcystamine (BACy). In addition, we have compared the BACy-based hydrogel with the NMBA-based polyacrylamide hydrogel for their physical properties such as swelling ratio, shear modulus, crosslink density and morphology. Moreover, we further studied whether BACy-based polyacrylamide hydrogel could be applied to SDS-PAGE and proteomics research. The results showed that this type of hydrogel is capable of separating proteins and facilitates further in-gel protein digestion and the following protein identification by mass spectrometry. In summary, our study provides a basis for the putative application of BACy-based hydrogels. 摘要傳統聚丙烯醯胺凝膠是以丙烯醯胺和二甲基雙丙烯醯胺 (NMBA) 進行自由基聚合反應並常用於生化技術如分離蛋白質的鈉十二烷基硫酸鹽聚丙烯醯胺電泳膠 (SDS-PAGE) 在本研究中, 我們製備了以二 ( 丙醯胺 ) 胱胺 (BACy) 取代 NMBA 的聚丙烯醯胺凝膠, 並比較兩系列膠體之物性如膨潤度, 剪模數, 交聯密度等及其形態學 我們進一步確認 BACy 的聚丙烯醯胺水膠是否適用於 SDS-PAGE 與蛋白質體學 結果顯示, 這類的水凝膠具分離蛋白質的能力, 並能配膠內水解及質譜儀的使用以鑑定凝膠中蛋白質 總結來說, 我們的研究提供了 BACy 為基質的聚丙烯醯胺水膠在應用上的基礎 1 Keywords N, N'-bisacrylylcystamine (BACy); Disulfide linkage; N, N'-methylenebisacrylamide (NMBA); SDS-PAGE 關鍵字二 ( 丙醯胺 ) 胱胺 ; 雙硫鍵結 ; 二甲基雙丙醯胺 ; 鈉十二烷基硫酸鹽聚丙烯醯胺凝膠電泳 Introduction SDS-PAGE has been the frequently used method in biochemical analysis and provides the capability to resolve complex protein mixtures based on the difference of their molecular weights [1]. In addition, threedimensional structure of polyacrylamide hydrogel is essential for SDS-PAGE [2]. The polyacrylamide hydrogel can be prepared from free radical polymerization of acrylamide in the presence of diverse two-functional cross-linkers such as the N,N'- methylenebisacrylamide (NMBA), 1,2-diacryl amide ethyleneglycol (DEG), ethyleneureabisacrylamide (EUB), N,N'-propylenebisacrylamide (PBA), N,N'-diallyltartardiamide (DATD), diacrylamide dimethylether, and ethylene diacrylate (EDA) [3~4]. The resulting polyacrylamide hydrogels exhibit diverse pore size within the three-dimensional structures and provide distinct applications in molecular separation and drug loading/release. Currently, bioanalytical methodology like proteomics frequently uses polyacrylamide hydrogels to separate proteins in the one- or two-dimensional gel electrophoresis. In addition, the cleavable polyacrylamide hydrogels have also been developed by incorporating a cleavable cross-linker into polymer structure. These cleavable crosslinkers include the oxidation-sensitive N,N -1,2-dihydroxyethylene bisacrylamide (DHEA) [5~6], the alkaline-sensitive ethylene
2 [7] glycol diacrylate (EGDA) and the reduction-sensitive N, N'-bisacrylylcystamine (BACy) [8]. Expansion of pore size within the gel structure is anticipated when such labile crosslinkers were put under conditions for cleavage. Proteomics represents a large-scale investigation on structures and functions of total proteins in cells or tissues [9~12]. A typical proteomics approach includes the extraction of peptides from in-gel protein digestion by proteases, and the subsequent amino acid sequencing by mass spectrometry. The pore expansion resulted from the cleavable polyacrylamide hydrogel upon cleavage conditions may increase the amount of extracted peptides or proteins for the subsequent analysis. Indeed, the base-labile EDGA was previously used to prepare the reversible gel which facilitates collecting the sufficient amount of radio-isotope-labeled proteins for scintillation counting [7, 13]. We herein investigate the characteristics of the reduction-cleavable polyacrylamide hydrogel as well as its application potential in proteomics study. Since condition of oxidation or base treatment causes damage and modification to protein structure, the reducible BACy crosslinker was used to prepare the cleavable polyacrylamide hydrogel for the following study. The disulfide linkage of BACy can be effectively and efficiently cleaved into two thiol groups upon treatment of reducing agents like 1,4-dithiothreitol (DTT) or 2-mercaptoethanol ( -ME) [14]. Therefore, such reductive cleavage within the three-dimensional structure of BACy-based polyacrylamide hydrogel provides a controllable manner to expand the gel pore size. In the present study, the swelling ratios and pore sizes of the BACy polyacrylamide hydrogel were measured and compared to those of the conventional NMBA polyacrylamide hydrogel. In addition, the model of drug release experiment of caffeine and bovine serum albumin (BSA), and diverse protein markers from different hydrogels under the treatment with or without reduction were carried out to demonstrate the reversibility of reducible polyacrylamide hydrogel. Results and Discussion Characterization of the Polyacrylamide Hydrogels 2 BACy was synthesized at good quality according to the modified procedure from our recent report (Figure 1) [14]. The corresponding polyacrylamide hydrogels were then prepared by mixing acrylamide with either NMBA or BACy as crosslinker (as shown in scheme 1) and the resulting hydrogels were respectively named as NP, BP a and BP b. NP hydrogel was prepared following the conventional recipe of acrylamide (0.967g, 13.6 mmole) and NMBA ratio (0.033g, mmole) for SDS-PAGE [15]. In addition, BP a hydrogel was prepared using the same weight ratio of acrylamide (0.967g, 13.6 mmole) and crosslinker (BACy, 0.033g, mmole) as in the NP hydrogel whereas BP b hydrogel used the same molar ratio of acrylamide (13.6 mmole) and crosslinker (BACy, mmole) as in the NP hydrogel. The feed compositions as well as the obtained physical and mechanical properties for all three polyacrylamide hydrogels were summarized in Table 1. In addition, the appearance of two BP hydrogels resembles the NP hydrogel in the aspect of transparency, softness, protein separation efficacy and effect of gel staining, as shown in Figure 2. We further measured the swelling ratio for each three hydrogels and the results shown in Table 1 indicated that the BP b hydrogel has the highest swelling ratio (13.91 g/g) whereas NP and BP a hydrogels have similar values, 9.78 g/g and g/g respectively. This is because the BP b hydrogel has the BACy crosslinker effect than NP hydrogels, which led to a larger structure in BP b hydrogel. Swelling kinetics profile of all three polyacrylamide hydrogels in deionized water at 25 C is shown in Figure 3. The measured values of SR eqs for polyacrylamide hydrogels indicated, i.e. BP b (13.91 g/g) > BP a (11.89 g/g)> NP (9.78 g/g). As shown in Table 1, the the G and x values of the polyacrylamide hydrogels are N/m 2, mol/cm 3 for NP gel, N/m 2, mol/cm 3 for BP a gel and N/m 2, mol/cm 3 for BP b gel. These values indicated the higher the gel strength (G) and the higher effective crosslinking density ( x ), the lower the swelling ratio of the hydrogels, i.e. NP> BP a > BP b. In addition, the low effective crosslinking density ( x ) of BP b indicated the less degree of crosslinking in the hydrogel structure, which allowed more water
3 absorption. The SEM was used to investigate the internal morphologies of the polyacrylamide hydrogels and the resulting micrographs of SEM clearly showed the pore sizes in these gels (Figure 4). Whereas BP a and BP b gels have the larger pore size, which explained the difference of swelling ratios among these gels. i.e. BP b > BP a > NP. Effects of BACy on Protein Separation All three polyacrylamide hydrogels were examined for their ability to resolve protein mixtures. As shown in Figure 5a, the BSA (M.W. 66 kda), PhaZ (M.W. 34 kda) and mixture of standard protein weight markers (ranged from 17 kda to 170 kda) were loaded into NP, BP a and BP b hydrogels respectively for the SDS-PAGE analysis. Our data showed that both BP hydrogels are capable to resolve proteins and the separation efficacy is comparable to NP hydrogel. Notably, all proteins exhibit slower mobility in BP b hydrogel than in other two hydrogels. This phenomenon is likely due to the fact that BP b gel has a higher content of crosslinker in the composition of polyacrylamide, which results in denser structure and smaller space for protein penetration. In addition, the retention factor (RF) which reflects the relative mobility of proteins in hydrogels during electrophoresis was calculated and listed in Table 2. Furthermore, plot of RF against molecular weight (M.W.) of protein weight markers was shown in Figure 5b. In summary, proteins with higher molecular weight travel fast in BP a hydrogel than in NP hydrogel whereas all proteins move relatively slowly in BP b hydrogel. However, both BP hydrogels exhibit good protein-separating ability comparing to NP hydrogel. Effects of BACy on Protein Identification Efficacy In a typical proteomics study involving SDS-PAGE, the in-gel trypsin digestion of selected protein band (or spot) into peptides and the subsequent mass spectrometric (MS) analysis are carried out to identify proteins within the polyacrylamide hydrogel. Although the disulfide linkage of BACy in polyacrylamide hydrogels may possibly react with the free thiol group in any protein, whether the presence of the disulfide bond 3 interferes with the trypsin digestion of proteins or the MS analysis of tryptic peptides remain unknown. We next investigated effects of BACy on the protein identification efficacy from NP, BP a and BP b hydrogels by a MALDI-TOF mass spectrometry (Figure 6). As shown in Table 3, the identification of BSA was achieved from all three hydrogels with similar identification score, sequence coverage and number of the identified peptides. These results indicated that the BACy content does not interfere with the identification process of BSA proteins, including the in-gel trypsin digestion procedure to generate peptides and the MS-based analysis of peptide masses. In summary, the BACy-based polyacrylamide hydrogels showed no interference with the typical protein identification and provide a good alternative for NP hydrogels. Effects of BACy on Caffeine and BSA Release As listed in Table 3, effects of BACy contents in the hydrogels on release of caffeine from hydrogels as shown the results indicated that the released amount of caffeine from caffeine-incubated copolymeric hydrogels increased upon the elevation of BACy contents from BP a (32.0 mg/g) to BP b (3.49 mg/g). Under DTT treatment, the released caffeine ratio in hydrogels also increases with an increase of BACy content in the hydrogels from BP a (32.7 mg/g) to BP b (4.08 mg/g). From these results, that contains higher ratio of BACy moiety such as BP b hydrogel was not significantly affected on caffeine released. All three hydrogels exhibited the increase of BSA release upon DTT treatment. Although NP gel doesn t not contain disulfide bond for cleavage by DTT, it is anticipated that disulfide linkage of BSA proteins within NP hydrogel was also reduced by DTT to adapt more linear conformation, which allows BSA to be easily released from gel network. Notably, the BPb hydrogel which has more molar ratio of BACy than BPa hydrogel released significant amount of BSA proteins than other hydrogels upon DTT reduction, which indicates the advantage of using BACy as cross-linking reagents in polyacrylamide hydrogel. Currently, the typical method to extract proteins from polyacrylamide hydrogel needs technique like electroelution
4 with limited yield. Therefore, the BP hydrogels could provide an alternative choice for researchers that intend to extract proteins of interest from protein-separating gel electrophoresis. Further investigation on conditions of protein extraction using BACy-based polyacrylamide hydrogel is suggested. Conclusions In this study, we have demonstrated that BP hydrogels exhibit comparable protein separation efficacy to NP hydrogel in SDS-PAGE analysis. In addition, the contents of BACy did not interfere with protein separation or the subsequent protein identification for proteomics study. Measurement of swelling ratios of NP, BP a and BP b hydrogels showed that BP a has the highest swelling ratio. In addition, the SEM analysis also verified that BP a hydrogel has the largest pore size. Further treatment of DTT on these gels showed that the swelling ratios of the reduced BP hydrogels were increased but not for NP hydrogel. This phenomenon is supported by the significant increase of BSA release upon DTT treatment in BP hydrogels. The BP b hydrogel exhibited the most degree of BSA release by DTT-mediated reduction of gel structure. Such protein release may be advantageous to researchers who use protein extraction to obtain proteins from gel electrophoresis. In summary, the current study provides a basis for the putative application of BACy-based polyacrylamide hydrogels in biochemical and proteomics study. [6] O'Connell, P. B.; Brady, C. J., Anal Biochem 1976, 76, 63. [7] Choules, G. L.; Zimm, B. H., Anal Biochem 1965, 13, 336. [8] Hansen, J. N., Anal Biochem 1976, 76, 37. [9] Wilkins, M. R.; Pasquali, C.; Appel, R. D.; Ou, K.; Golaz, O.; Sanchez, J. C.; Yan, J. X.; Gooley, A. A.; Hughes, G.; Humphery-Smith, I.; Williams, K. L.; Hochstrasser, D. F., Biotechnology (N Y) 1996, 14, 61. [10] James, P., Q Rev Biophys 1997, 30, 279. [11] Anderson, N. L.; Anderson, N. G., Electrophoresis 1998, 19, [12] Blackstock, W. P.; Weir, M. P., Trends Biotechnol 1999, 17, 121. [13] Alpers, D. H.; Glickman, R., Anal Biochem 1970, 35, 314. [14] Lin, Y.-S.; Lee, H.-H.; Lin, C.-H.; Lee, W.-F., J. Chin. Chem. Soc. 2013, 60, 223. [15] Gallagher, S. R. In Current Protocols in Immunology; John Wiley & Sons, Inc., Acknowledgements This work was supported by the National Science Council of Taiwan, R.O.C. (NSC M , B and B ). References [1] Laemmli, U. K., Nature 1970, 227, 680. [2] Hjerten, S.; Mosbach, R., Anal Biochem 1962, 3, 109. [3] Hjerten, S., Arch Biochem Biophys 1962, Suppl 1, 147. [4] Gelfi, C.; Righetti, P. G., Electrophoresis 1981, 2, 213. [5] Anderson, L. E.; McClure, W. O., Anal Biochem 1973, 51,
5 Scheme 1 Synthesis of polyacrylamide hydrogels Table 1 Feed compositions and physical properties of the polyacrylamide hydrogels Gel code AAm (mmole) NMBA (mmole) BACy (mmole) SReq (g/g) G 10 4 (N/m 2 ) wet gel ρx 10 5 (mole/cm 3 ) NP BPa BPb Table 2 Relative mobility based on the Rf value of BSA, PhaZ and protein weight markers on NP, BP a and BP b hydrogels. Retention factor (Rf) Proteins NP hydrogel BPa hydrogel BPb hydrogel BSA (66 kda) PhaZ (34 kda) kda marker kda marker kda marker kda marker kda marker kDa marker kda marker kda marker kda marker Table 3 Effects of BACy on the protein identification and the swelling ratio as well as caffeine and BSA release upon DTT reduction 5
6 (a) (b) Figure 1. The BACy has mp of C (a) and purity than 99 % based on High Pressure Liquid Chromatography (b) Figure 4. SEM photographs of NP, BP a and BP b hydrogels at 100x. (a) Figure 2. Appearance of NP, BP a and BP b SDS-PAGE gels. (A) Transparency of polyacrylamide hydrogels (B) Separation of prestained protein markers (C) Coomassie blue staining of gels loading with proteins of BSA and PhaZ. (b) Figure 5. SDS-PAGE with NMBA or BACy cross-linker (a) and RF of BSA, Phaz and Maker by 1-dimensional gel band during SDS-PAGE(b). Figure 3. Swelling ratio as a function of time for the present hydrogels containing different cross-linkers. Figure 6. Mass spectra of the identified BSA from NP, BP a and BP b gels using a MALDI-TOF MS. 6
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