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. 1997 Jun 15;324(Pt 3):963–970. doi: 10.1042/bj3240963

Type 1 ribosome-inactivating proteins are the most abundant proteins in iris (Iris hollandica var. Professor Blaauw) bulbs: characterization and molecular cloning.

E J Van Damme 1, A Barre 1, L Barbieri 1, P Valbonesi 1, P Rouge 1, F Van Leuven 1, F Stirpe 1, W J Peumans 1
PMCID: PMC1218515  PMID: 9210423

Abstract

The most abundant protein of Iris bulbs has been identified as a type 1 ribosome-inactivating protein (RIP). Analysis of the purified proteins and molecular cloning of the corresponding cDNAs demonstrated that this type 1 RIP is a mixture of three isoforms that exhibit a high degree of sequence identity and have similar, though not identical, ribosome-inactivating and polynucleotide:adenosine glycosidase activities. The accumulation of large quantities of type 1 RIP in a vegetative storage organ suggests that this presumed defence-related protein also plays a role in the nitrogen-storage metabolism of the bulb.

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Selected References

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