The experimental strategy used to characterize the peptidefraction yielded 1374 unique peptides using database searchingwith Mascot. Their molecular weight ranged between 515.3 Da and3624 Da, and the average molecular weight was 1434 Da (Fig. 2B).We identified 11 more peptides with molecular weights in the500–1000 Da range using de novo peptide sequencing with PEAKssoftware, so the total number of identified peptides was 1385.
As illustrated in Fig. 2C, most of the identified peptides (874,63.1%) had a molecular weight in the 1000–2000 Da range. The500–1000 Da mass range included 427 (30.8%) identified peptides.We only identified 84 peptides (6.1%) in the 2000–5000 Da massrange and did not detect any peptide with a molecular weightbelow 500 Da or above 5000 Da. These results are complementaryto the molecular weight profile obtained by HPSEC; they providequalitative providequalitative data to complete the quantitative HPSEC data. Thus,although the 1000–2000 Da mass range represented only 24.6%of the compound, it contained the highest diversity of peptides,suggesting that each peptide was present in low quantity. Thesame was observed in the 500–1000 Da mass range. Conversely,the 2000–5000 Da mass range represented a high ratio (34.7%) ofthe hydrolysate but only 236 identified peptides, suggesting thatthey were more concentrated. We did not identify any sequence ofhydrolytic peptides with a molecular weight below 500 Da becauselow-molecular-weight peptides generate low numbers of frag-ment peaks that result in ambiguous results [23]. Fig. 2 illustratesthe specificities of each mass spectrometry method we used. Weidentified a larger number of peptides in MALDI-TOF/TOF (799peptides) than in ESI-MS/MS (603 peptides) and their moleculardistribution differed. The average molecular weight of the ESI-MS/MS peptides was 1108 Da versus 1529 Da in MALDI-TOF/TOF.This is a direct result of the respective mass ranges targeted by eachtechnique.
กลยุทธ์การทดลองใช้ในลักษณะ peptidefraction หา 1374 เปปไทด์เฉพาะที่ใช้ฐานข้อมูล searchingwith แมสคอท ของน้ำหนักโมเลกุลอยู่ในช่วงระหว่าง 515.3 ดา and3624 ดา และ 1434 ดา (Fig. 2B) มีน้ำหนักโมเลกุลเฉลี่ย เราระบุ 11 เปปไทด์เพิ่มเติม มีน้ำหนักโมเลกุลในช่วงดา the500-1000 ใช้ลำดับ de novo เปป PEAKssoftware ดังนั้นจำนวนของเปปไทด์ที่ระบุถูก 1385As illustrated in Fig. 2C, most of the identified peptides (874,63.1%) had a molecular weight in the 1000–2000 Da range. The500–1000 Da mass range included 427 (30.8%) identified peptides.We only identified 84 peptides (6.1%) in the 2000–5000 Da massrange and did not detect any peptide with a molecular weightbelow 500 Da or above 5000 Da. These results are complementaryto the molecular weight profile obtained by HPSEC; they providequalitative providequalitative data to complete the quantitative HPSEC data. Thus,although the 1000–2000 Da mass range represented only 24.6%of the compound, it contained the highest diversity of peptides,suggesting that each peptide was present in low quantity. Thesame was observed in the 500–1000 Da mass range. Conversely,the 2000–5000 Da mass range represented a high ratio (34.7%) ofthe hydrolysate but only 236 identified peptides, suggesting thatthey were more concentrated. We did not identify any sequence ofhydrolytic peptides with a molecular weight below 500 Da becauselow-molecular-weight peptides generate low numbers of frag-ment peaks that result in ambiguous results [23]. Fig. 2 illustratesthe specificities of each mass spectrometry method we used. Weidentified a larger number of peptides in MALDI-TOF/TOF (799peptides) than in ESI-MS/MS (603 peptides) and their moleculardistribution differed. The average molecular weight of the ESI-MS/MS peptides was 1108 Da versus 1529 Da in MALDI-TOF/TOF.This is a direct result of the respective mass ranges targeted by eachtechnique.
การแปล กรุณารอสักครู่..