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1cb5

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[[Image:1cb5.jpg|left|200px]]
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{{STRUCTURE_1cb5| PDB=1cb5 | SCENE= }}
{{STRUCTURE_1cb5| PDB=1cb5 | SCENE= }}
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'''HUMAN BLEOMYCIN HYDROLASE.'''
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===HUMAN BLEOMYCIN HYDROLASE.===
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==Overview==
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BACKGROUND: Bleomycin hydrolase (BH) is a cysteine protease that is found in all tissues in mammals as well as in many other eukaryotes and prokaryotes. Although its conserved cellular function is as yet unknown, human bleomycin hydrolase (hBH) has clinical significance in that it is thought to be the major cause of tumor cell resistance to bleomycin chemotherapy. In addition, it has been reported that an allelic variant of hBH is genetically linked to Alzheimer's disease. RESULTS: We have determined the crystal structures of wild-type hBH and of a mutant form of the enzyme. The overall structure is very similar to that of the previously determined yeast homolog, however, there is a striking difference in the charge distribution. The central channel, which has a strong positive electrostatic potential in the yeast protein, is slightly negative in hBH. We have determined that hBH does not have the DNA-binding activity of the yeast protein and that the enzyme is localized to the cytoplasm. CONCLUSIONS: The difference in charge distribution between the yeast and human BH enzymes is most likely responsible for the difference in DNA-binding activity. Nevertheless, the C-terminal autoprocessing activity and the role of the C terminus as a determinant for peptidase activity are conserved between the yeast and human forms. The structure of hBH suggests that the putative Alzheimer's disease linked variation does not directly alter the intrinsic peptidase activity. Rather, the position of the mutation suggests that it could affect interactions with another protein, which may modulate peptidase activity through repositioning of the C terminus.
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(as it appears on PubMed at http://www.pubmed.gov), where 10404591 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10404591}}
==About this Structure==
==About this Structure==
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[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Self-compartmentalizing]]
[[Category: Self-compartmentalizing]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 12:32:31 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 20:30:10 2008''

Revision as of 17:30, 30 June 2008

Image:1cb5.png

Template:STRUCTURE 1cb5

HUMAN BLEOMYCIN HYDROLASE.

Template:ABSTRACT PUBMED 10404591

About this Structure

1CB5 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Crystal structure of human bleomycin hydrolase, a self-compartmentalizing cysteine protease., O'Farrell PA, Gonzalez F, Zheng W, Johnston SA, Joshua-Tor L, Structure. 1999 Jun 15;7(6):619-27. PMID:10404591

Page seeded by OCA on Mon Jun 30 20:30:10 2008

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