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Sasakura Y, Nogami M, Kobayashi N, Kanda K. Vibratory reaction unit for the rapid analysis of proteins and glycochains. Anal Chem Insights 2007; 2:69-74. [PMID: 19662179 PMCID: PMC2716815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A protein digestion system using immobilized enzymes for protein identification and glycochain analyses has been developed, and a vibration reaction unit for micro-scale sample convection on an enzyme-immobilized solid surface was constructed. BSA as a model substrate was digested by this unit, and was successfully identified by mass spectrometry (MS) analyses. Compared to the conventional liquid-phase digestion, the reaction unit increased the number of matched peptides from 9 to 26, protein score from 455 to 1247, and sequence coverage from 21% to 48%. Glycopeptidase F (NGF), an enzyme that cleaves N-glycans from glycoproteins, was also immobilized and used to remove the glycochains from human immunoglobulin G (IgG). Trypsin and NGF were immobilized on the same solid surface and used to remove glycochains from IgG in single-step. Glycochains were labeled with fluorescent reagent and analyzed by HPLC. Several peaks corresponding to the glycochains of IgG were detected. These results suggested that the single-step digestion system, by immobilized multiple enzymes (trypsin and NGF) would be effective for the rapid structural analysis of glycoproteins.
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Affiliation(s)
- Yukie Sasakura
- Bio-Medical Center, R&D Division, Nanotechnology Product Business Group, Hitachi High-Technologies Corporation, Hitachinaka, Ibaraki, 312-8504, Japan.,Correspondence: Yukie Sasakura, Bio-Medical Center, R & D Division, Nanotechnology Product Business Group, Hitachi High-Technologies Corporation, 882, Ichige, Hitachinaka, Ibaraki, 312-8504, Japan. Tel: +81-29-276-6121; Fax: +81-29-273-5174;
| | - Makoto Nogami
- Bio-Medical Center, R&D Division, Nanotechnology Product Business Group, Hitachi High-Technologies Corporation, Hitachinaka, Ibaraki, 312-8504, Japan
| | - Noriko Kobayashi
- Naka Application Center, Nanotechnology Product Business Group, Hitachi High-Technologies Corporation, Hitachinaka, Ibaraki, 312-0057, Japan
| | - Katsuhiro Kanda
- Bio-Medical Center, R&D Division, Nanotechnology Product Business Group, Hitachi High-Technologies Corporation, Hitachinaka, Ibaraki, 312-8504, Japan
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