参考文献:10.1093/protein/5.5.413 摘要:Teplyakov AV, van der Laan JM, Lammers AA, Kelders H, Kalk KH, Misset O, Mulleners LJ, Dijkstra BW. Protein engineering of the high-alkaline serine protease PB92 from Bacillus alcalophilus: functional and structural consequences of mutation at the S4 substrate binding pocket. Protein Eng. 1992 Jul;5(5):413–20. doi: 10.1093/protein/5.5.413.