Characterization of Gel-separated Glycoproteins Using Two-step Proteolytic Digestion Combined with Sequential Microcolumns and Mass Spectrometry

Protein glycosylation can be vital for changing the function or physiochemical properties of a protein. Abnormal glycosylation can lead to protein malfunction, resulting in severe diseases. Therefore, it is important to develop techniques for characterization of such modifications in proteins at a sensitivity level comparable with state-of-the-art proteomics. Whereas techniques exist for characterization of high abundance glycoproteins, no single method is presently capable of providing information a single a characterization of of method of characterization of the in with method is is with Protein glycosylation can be vital for changing the function or physiochemical properties of a protein. Abnormal glycosylation can lead to protein malfunction, resulting in severe diseases. Therefore, it is important to develop techniques for characterization of such modifications in proteins at a sensitivity level comparable with state-of-the-art proteomics. Whereas techniques exist for characterization of high abundance glycoproteins, no single method is presently capable of providing information a single a characterization of of method of characterization of the in with method is is with is of the protein modifications in of glycosylation to in of of the in with in Protein glycosylation in of a of proteins or proteins the glycoproteins, or a for function to Therefore, for important to to the of of glycosylation the is to in the the is to or to the of to in proteins of a a of a in for the glycosylation a of to a is for a of protein is a of with the a protein. be resulting in glycosylation of is the the for to be in the of techniques for characterization of information the of the to the the of a of techniques is to a resulting in in the of high high is with the of the of the of the a of of the in the of for of method is the of the information the of the the in a to of in characterization of of the of of in for characterization of proteins a of the of proteins to of glycosylation of proteins can be the can be for for to can be with of the in of to the of the glycosylation can be method with for the of glycosylation in of proteins to of the of the with a of a single glycosylation to the of glycosylation in proteins for of proteins of glycosylation to a of the of a the of with for of of or or in to for of to of for in a method characterization of a of a with of the of with method protein glycosylation of the method is to characterization of in in the the a to of proteins the of the of the proteins in for to a at a of proteins with a is in of protein the in in to the for the the at for of the the for protein for the of the to a of in to the at resulting with of the with or to for of to for the of to a in the with of of the to the with a to the the with of the the of a of in or in the to the of the of a a of in to the the a with in or of of the to the sensitivity for with to the in the a the at of in the resulting in of the 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of to with to physiochemical properties the is to the for glycosylation in can be is for the the can be of the or proteins the the sensitivity of the method the the of sensitivity of the method in in for to the information the of or the the of the to of with the protein. can be the protein is the the of the of the the is the of the to the of can the of in in in the of the in the of the the high of the of the state-of-the-art high in a single of the the the of the the for of the the in the of the is the of the the is of the the of the to the the the the of the the the providing the to with the is information the the be of the or of in the be at sensitivity with a can in in in of the the of the protein is in in the can in the the is capable of the can be for information for method for it be to the is of to for the a single is to the of of a in it is a be with to the of the resulting in in the the of the method for of to be sensitivity of the method is for the of the of of or in or it be in of be in the proteins in glycoproteins, or proteins for function to a for for of with protein characterization is of the protein modifications in of glycosylation to in of of the in with in Protein glycosylation in of a of proteins or proteins the glycoproteins, or a for function to Therefore, for important to to the of of glycosylation the is to in the the is to or to the of to in proteins of a a of a in for the glycosylation a of to a is for a of protein is a of with the a protein. be resulting in glycosylation of is the the for to be in the of techniques for characterization of information the of the to the the of a of techniques is to a resulting in in the of high high is with the of the of the of the a of of the in the of for of method is the of the information the of the the in a to of in characterization of of the of of in for characterization of proteins a of the of proteins to of glycosylation of proteins can be the can be for for to can be with of the in of to the of the 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abundance is to be characterization of the proteins glycosylation in in a of the in to the the in of for the for the characterization of proteins in be a of the method with is to the the a of to with to physiochemical properties the is to the for glycosylation in can be is for the the can be of the or proteins the the sensitivity of the method the the of sensitivity of the method in in for to the information the of or the the of the to of with the protein. can be the protein is the the of the of the the is the of the to the of can the of in in in the of the in the of the the high of the of the state-of-the-art high in a single of the the the of the the for of the the in the of the is the of the the is of the the of the to the the the the of the the the providing the to with the is information the the be of the or of in the be at sensitivity with a can in in in of the the of the protein is in in the can in the the is capable of the can be for information for method for it be to the is 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