1h7j: Difference between revisions

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[[Image:1h7j.jpg|left|200px]]
{{Seed}}
[[Image:1h7j.png|left|200px]]


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{{STRUCTURE_1h7j|  PDB=1h7j  |  SCENE=  }}  
{{STRUCTURE_1h7j|  PDB=1h7j  |  SCENE=  }}  


'''SOLUTION STRUCTURE OF THE 26 AA PRESEQUENCE OF 5-ALAS'''
===SOLUTION STRUCTURE OF THE 26 AA PRESEQUENCE OF 5-ALAS===




==Overview==
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The mitochondrial import of 5-aminolevulinate synthase (ALAS), the first enzyme of the mammalian heme biosynthetic pathway, requires the N-terminal presequence. The 49 amino acid presequence transit peptide (psALAS) for murine erythroid ALAS was chemically synthesized, and circular dichroism and (1)H nuclear magnetic resonance (NMR) spectroscopies used to determine structural elements in trifluoroethanol/H(2)O solutions and micellar environments. A well defined amphipathic alpha-helix, spanning L22 to F33, was present in psALAS in 50% trifluoroethanol. Further, a short alpha-helix, defined by A5-L8, was also apparent in the 26 amino acid N-terminus peptide, when its structure was determined in sodium dodecyl sulfate. Heme inhibition of ALAS mitochondrial import has been reported to be mediated through cysteine residues in presequence heme regulatory motifs (HRMs). A UV/visible and (1)H NMR study of hemin and psALAS indicated that a heme-peptide interaction occurs and demonstrates, for the first time, that heme interacts with the HRMs of psALAS.
The line below this paragraph, {{ABSTRACT_PUBMED_11566198}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 11566198 is the PubMed ID number.
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{{ABSTRACT_PUBMED_11566198}}


==About this Structure==
==About this Structure==
1H7J is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H7J OCA].  
1H7J is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1H7J OCA].  


==Reference==
==Reference==
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[[Category: Nmr structure]]
[[Category: Nmr structure]]
[[Category: Presequence]]
[[Category: Presequence]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:32:14 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 06:45:16 2008''

Revision as of 03:45, 1 July 2008

File:1h7j.png

Template:STRUCTURE 1h7j

SOLUTION STRUCTURE OF THE 26 AA PRESEQUENCE OF 5-ALAS

Template:ABSTRACT PUBMED 11566198

About this Structure

1H7J is a Single protein structure of sequence from Mus musculus. Full experimental information is available from OCA.

Reference

The solution structure and heme binding of the presequence of murine 5-aminolevulinate synthase., Goodfellow BJ, Dias JS, Ferreira GC, Henklein P, Wray V, Macedo AL, FEBS Lett. 2001 Sep 14;505(2):325-31. PMID:11566198

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