1r14

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{{STRUCTURE_1r14| PDB=1r14 | SCENE= }}
{{STRUCTURE_1r14| PDB=1r14 | SCENE= }}
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'''Carbohydrate recognition and neck domains of surfactant protein A (Sp-A) containing samarium'''
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===Carbohydrate recognition and neck domains of surfactant protein A (Sp-A) containing samarium===
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==Overview==
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Surfactant protein A (SP-A), one of four proteins associated with pulmonary surfactant, binds with high affinity to alveolar phospholipid membranes, positioning the protein at the first line of defense against inhaled pathogens. SP-A exhibits both calcium-dependent carbohydrate binding, a characteristic of the collectin family, and specific interactions with lipid membrane components. The crystal structure of the trimeric carbohydrate recognition domain and neck domain of SP-A was solved to 2.1-A resolution with multiwavelength anomalous dispersion phasing from samarium. Two metal binding sites were identified, one in the highly conserved lectin site and the other 8.5 A away. The interdomain carbohydrate recognition domain-neck angle is significantly less in SP-A than in the homologous collectins, surfactant protein D, and mannose-binding protein. This conformational difference may endow the SP-A trimer with a more extensive hydrophobic surface capable of binding lipophilic membrane components. The appearance of this surface suggests a putative binding region for membrane-derived SP-A ligands such as phosphatidylcholine and lipid A, the endotoxic lipid component of bacterial lipopolysaccharide that mediates the potentially lethal effects of Gram-negative bacterial infection.
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(as it appears on PubMed at http://www.pubmed.gov), where 12913002 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12913002}}
==About this Structure==
==About this Structure==
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[[Category: Alpha helical neck region]]
[[Category: Alpha helical neck region]]
[[Category: Crd]]
[[Category: Crd]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 06:56:56 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 03:17:19 2008''

Revision as of 00:17, 29 July 2008

Image:1r14.png

Template:STRUCTURE 1r14

Carbohydrate recognition and neck domains of surfactant protein A (Sp-A) containing samarium

Template:ABSTRACT PUBMED 12913002

About this Structure

1R14 is a Single protein structure of sequence from Rattus norvegicus. Full crystallographic information is available from OCA.

Reference

Crystal structure of trimeric carbohydrate recognition and neck domains of surfactant protein A., Head JF, Mealy TR, McCormack FX, Seaton BA, J Biol Chem. 2003 Oct 31;278(44):43254-60. Epub 2003 Aug 11. PMID:12913002

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