2o3e: Difference between revisions

From Proteopedia
Jump to navigationJump to search
← Older editNewer edit →
OCA (talk | contribs)
Bots, Bureaucrats, journal, Administrators
3,330,058 edits
No edit summary
OCA (talk | contribs)
Bots, Bureaucrats, journal, Administrators
3,330,058 edits
No edit summary
Line 1: Line 1:
[[Image:2o3e.gif|left|200px]]
{{Seed}}
[[Image:2o3e.png|left|200px]]


<!--
<!--
Line 9: Line 10:
{{STRUCTURE_2o3e|  PDB=2o3e  |  SCENE=  }}  
{{STRUCTURE_2o3e|  PDB=2o3e  |  SCENE=  }}  


'''Crystal structure of engineered neurolysin with thimet oligopeptidase specificity for neurotensin cleavage site.'''
===Crystal structure of engineered neurolysin with thimet oligopeptidase specificity for neurotensin cleavage site.===




==Overview==
<!--  
Thimet oligopeptidase (EC 3.4.24.15) and neurolysin (EC 3.4.24.16) are closely related zinc-dependent metallopeptidases that metabolize small bioactive peptides. They cleave many substrates at the same sites, but they recognize different positions on others, including neurotensin, a 13-residue peptide involved in modulation of dopaminergic circuits, pain perception, and thermoregulation. On the basis of crystal structures and previous mapping studies, four sites (Glu-469/Arg-470, Met-490/Arg-491, His-495/Asn-496, and Arg-498/Thr-499; thimet oligopeptidase residues listed first) in their substrate-binding channels appear positioned to account for differences in specificity. Thimet oligopeptidase mutated so that neurolysin residues are at all four positions cleaves neurotensin at the neurolysin site, and the reverse mutations in neurolysin switch hydrolysis to the thimet oligopeptidase site. Using a series of constructs mutated at just three of the sites, it was determined that mutations at only two (Glu-469/Arg-470 and Arg-498/Thr-499) are required to swap specificity, a result that was confirmed by testing the two-mutant constructs. If only either one of the two sites is mutated in thimet oligopeptidase, then the enzyme cleaves almost equally at the two hydrolysis positions. Crystal structures of both two-mutant constructs show that the mutations do not perturb local structure, but side chain conformations at the Arg-498/Thr-499 position differ from those of the mimicked enzyme. A model for differential recognition of neurotensin based on differences in surface charge distribution in the substrate binding sites is proposed. The model is supported by the finding that reducing the positive charge on the peptide results in cleavage at both hydrolysis sites.
The line below this paragraph, {{ABSTRACT_PUBMED_17251185}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 17251185 is the PubMed ID number.
-->
{{ABSTRACT_PUBMED_17251185}}


==About this Structure==
==About this Structure==
Line 20: Line 24:
==Reference==
==Reference==
Swapping the substrate specificities of the neuropeptidases neurolysin and thimet oligopeptidase., Lim EJ, Sampath S, Coll-Rodriguez J, Schmidt J, Ray K, Rodgers DW, J Biol Chem. 2007 Mar 30;282(13):9722-32. Epub 2007 Jan 24. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17251185 17251185]
Swapping the substrate specificities of the neuropeptidases neurolysin and thimet oligopeptidase., Lim EJ, Sampath S, Coll-Rodriguez J, Schmidt J, Ray K, Rodgers DW, J Biol Chem. 2007 Mar 30;282(13):9722-32. Epub 2007 Jan 24. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/17251185 17251185]
Structure of neurolysin reveals a deep channel that limits substrate access., Brown CK, Madauss K, Lian W, Beck MR, Tolbert WD, Rodgers DW, Proc Natl Acad Sci U S A. 2001 Mar 13;98(6):3127-32. Epub 2001 Mar 6. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11248043 11248043]
[[Category: Neurolysin]]
[[Category: Neurolysin]]
[[Category: Rattus norvegicus]]
[[Category: Rattus norvegicus]]
Line 27: Line 33:
[[Category: Substrate-binding channel]]
[[Category: Substrate-binding channel]]
[[Category: Thermolysin-like domain]]
[[Category: Thermolysin-like domain]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 10:16:51 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 03:17:59 2008''
Retrieved from "https://proteopedia.org/2o3e"