PDBsum entry 1ton

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Hydrolase(serine proteinase) PDB id
Protein chain
228 a.a.
Waters ×149

References listed in PDB file
Key reference
Title Rat submaxillary gland serine protease, Tonin. Structure solution and refinement at 1.8 a resolution.
Authors M.Fujinaga, M.N.James.
Ref. J Mol Biol, 1987, 195, 373-396.
PubMed id 2821276
Tonin is a mammalian serine protease that is capable of generating the vasoconstrictive agent, angiotensin II, directly from its precursor protein, angiotensinogen, a process that normally requires two enzymes, renin and angiotensin-converting enzyme. The X-ray crystallographic structure determination and refinement of tonin at 1.8 A resolution and the analysis of the resulting model are reported. The initial phases were obtained by the method of molecular replacement using as the search model the structure of bovine trypsin. The refined model of tonin consists of 227 amino acid residues out of the 235 in the complete molecule, 149 water molecules, and one zinc ion. The R-factor (R = sigma Fo - Fc/sigma Fo) is 0.196 for the 14,997 measured data between 8 and 1.8 A resolution with I greater than or equal to sigma (I). It is estimated that the overall root-mean-square error in the coordinates is about 0.3 A. The structure of tonin that has been determined is not in its active conformation, but one that has been perturbed by the binding of Zn2+ in the active site. Zn2+ was included in the buffer to aid the crystallization. Nevertheless, the structure of tonin that is described is for the most part similar to its native form as indicated by the close tertiary structural homology with kallikrein. The differences in the structures of the two enzymes are concentrated in several loop regions; these structural differences are probably responsible for the differences in their reactivities and specificities.
Secondary reference #1
Title Kallikrein-Related mrnas of the rat submaxillary gland: nucleotide sequences of four distinct types including tonin.
Authors P.L.Ashley, R.J.Macdonald.
Ref. Biochemistry, 1985, 24, 4512-4520. [DOI no: 10.1021/bi00338a005]
PubMed id 2998455
Full text Abstract
Secondary reference #2
Title Amino acid sequence of rat submaxillary tonin reveals similarities to serine proteases.
Authors C.Lazure, R.Leduc, N.G.Seidah, G.Thibault, J.Genest, M.Chrétien.
Ref. Nature, 1984, 307, 555-558.
PubMed id 6320014
Secondary reference #3
Title Crystal data for tonin, An enzyme involved in the formation of angiotensin ii.
Authors K.Hayakawa, J.A.Kelly, M.N.James.
Ref. J Mol Biol, 1978, 123, 107-111.
PubMed id 210285
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