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1l3q

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{{STRUCTURE_1l3q| PDB=1l3q | SCENE= }}
{{STRUCTURE_1l3q| PDB=1l3q | SCENE= }}
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'''H. rufescens abalone shell Lustrin A consensus repeat, FPGKNVNCTSGE, pH 7.4, 1-H NMR structure'''
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===H. rufescens abalone shell Lustrin A consensus repeat, FPGKNVNCTSGE, pH 7.4, 1-H NMR structure===
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==Overview==
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The lustrin superfamily represents a unique group of biomineralization proteins localized between layered aragonite mineral plates (i.e., nacre layer) in mollusk shell. Recent atomic force microscopy (AFM) pulling studies have demonstrated that the lustrin-containing organic nacre layer in the abalone, Haliotis rufescens, exhibits a typical sawtooth force-extension curve with hysteretic recovery. This force extension behavior is reminiscent of reversible unfolding and refolding in elastomeric proteins such as titin and tenascin. Since secondary structure plays an important role in force-induced protein unfolding and refolding, the question is, What secondary structure(s) exist within the major domains of Lustrin A? Using a model peptide (FPGKNVNCTSGE) representing the 12-residue consensus sequence found near the N-termini of the first eight cysteine-rich domains (C-domains) within the Lustrin A protein, we employed CD, NMR spectroscopy, and simulated annealing/minimization to determine the secondary structure preferences for this sequence. At pH 7.4, we find that the 12-mer sequence adopts a loop conformation, consisting of a "bend" or "turn" involving residues G3-K4 and N7-C8-T9, with extended conformations arising at F1-G3; K4-V6; T9-S10-G11 in the sequence. Minor pH-dependent conformational effects were noted for this peptide; however, there is no evidence for a salt-bridge interaction between the K4 and E12 side chains. The presence of a loop conformation within the highly conserved -PG-, -NVNCT- sequence of C1-C8 domains may have important structural and mechanistic implications for the Lustrin A protein with regard to elastic behavior.
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{{ABSTRACT_PUBMED_11920437}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L3Q OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1L3Q OCA].
==Reference==
==Reference==
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[[Category: Zhang, B.]]
[[Category: Zhang, B.]]
[[Category: Loop]]
[[Category: Loop]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 11:38:34 2008''

Revision as of 08:38, 2 July 2008

Image:1l3q.png

Template:STRUCTURE 1l3q

H. rufescens abalone shell Lustrin A consensus repeat, FPGKNVNCTSGE, pH 7.4, 1-H NMR structure

Template:ABSTRACT PUBMED 11920437

About this Structure

Full experimental information is available from OCA.

Reference

Model peptide studies of sequence regions in the elastomeric biomineralization protein, Lustrin A. I. The C-domain consensus-PG-, -NVNCT-motif., Zhang B, Wustman BA, Morse D, Evans JS, Biopolymers. 2002 May;63(6):358-69. PMID:11920437

Page seeded by OCA on Wed Jul 2 11:38:34 2008

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