Mammalian (rat) ribosomes have 80 proteins; the sequence of amino acids in 75 have been determined. What has been learned of the structure of the rat ribosomal proteins is reviewed with particular… (More)
The ribotoxins alpha-sarcin and ricin catalyse covalent modifications in adjacent nucleotides in 28S rRNA, yet the elements of nucleic acid structure that they recognize are not only different but… (More)
Ricin is a cytotoxic protein that inactivates ribosomes by hydrolyzing the N-glycosidic bond between the base and the ribose at position A4324 in eukaryotic 28 S rRNA. The requirements for the… (More)
The covalent structures of rat ribosomal proteins P0, P1, and P2 were deduced from the sequences of nucleotides in recombinant cDNAs. P0 contains 316 amino acids and has a molecular weight of 34,178;… (More)
Ricin A-chin and alpha-sarcin are ribotoxins that inactivate eukaryotic ribosomes by modifying 28 S rRNA; ricin A-chain is an RNA N-glycosidase that depurinates the adenosine at position 4324 and… (More)
Ricin is a cytotoxic protein that inactivates ribosomes by hydrolyzing the N-glycosidic bond between the base and the ribose of the adenosine at position 4324 in eukaryotic 28 S rRNA. Ricin A-chain… (More)
alpha-Sarcin is a ribonuclease that cleaves the phosphodiester bond on the 3' side of G4325 in 28S rRNA; ricin A-chain is a RNA N-glycosidase that depurinates the 5' adjacent A4324. These single… (More)
A series of contiguous deletions were made in a cDNA encoding the ribonuclease restrictocin with the purpose of identifying the amino acids that are essential for the cleavage of the phosphodiester… (More)
alpha-Sarcin is a cytotoxic protein that inactivates ribosomes by hydrolyzing a single phosphodiester bond on the 3' side of G-4325 in eukaryotic 28 S rRNA. We have examined the requirements for the… (More)
Ricin A-chain is a cytotoxic RNA N-glycosidase that inactivates eukaryotic ribosomes by depurinating the adenosine at position 4324 in 28S rRNA. The enzyme retains its specificity when a synthetic… (More)