Barley alpha-amylase bound to its endogenous protein inhibitor BASI: crystal structure of the complex at 1.9 A resolution.
Vallee, F., Kadziola, A., Bourne, Y., Juy, M., Rodenburg, K.W., Svensson, B., Haser, R.(1998) Structure 6: 649-659
- PubMed: 9634702 
- DOI: https://doi.org/10.1016/s0969-2126(98)00066-5
- Primary Citation of Related Structures:  
1AVA - PubMed Abstract: 
Barley alpha-amylase is a 45 kDa enzyme which is involved in starch degradation during barley seed germination. The released sugars provide the plant embryo with energy for growth. The major barley alpha-amylase isozyme (AMY2) binds with high affinity to the endogenous inhibitor BASI (barley alpha-amylase/subtilisin inhibitor) whereas the minor isozyme (AMY1) is not inhibited. BASI is a 19.6 kDa bifunctional protein that can simultaneously inhibit AMY2 and serine proteases of the subtilisin family. This inhibitor may therefore prevent degradation of the endosperm starch during premature sprouting and protect the seed from attack by pathogens secreting proteases.
Organizational Affiliation: 
Macromolécules Biologiques, UPR 9039, Institut de Biologie Structurale et Microbiologie, CNRS, France.