Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin
The complete sequence has been determined for the A 2 subunit of crustacyanin, an astaxanthin‐binding protein from the carapace of the lobster Homarus gammarus . The polypeptide chain is 174 residues long and is similar to proteins of the retinol‐binding protein superfamily. Some regions of the sequ...
Published in: | European Journal of Biochemistry |
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crwiley:10.1111/j.1432-1033.1991.tb15925.x 2024-09-30T14:36:15+00:00 Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin KEEN, Jeffrey N. CACERES, Isabel ELIOPOULOS, Elias E. ZAGALSKY, Peter F. FINDLAY, John B.C. 1991 http://dx.doi.org/10.1111/j.1432-1033.1991.tb15925.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1432-1033.1991.tb15925.x https://febs.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1432-1033.1991.tb15925.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor European Journal of Biochemistry volume 197, issue 2, page 407-417 ISSN 0014-2956 1432-1033 journal-article 1991 crwiley https://doi.org/10.1111/j.1432-1033.1991.tb15925.x 2024-09-17T04:49:47Z The complete sequence has been determined for the A 2 subunit of crustacyanin, an astaxanthin‐binding protein from the carapace of the lobster Homarus gammarus . The polypeptide chain is 174 residues long and is similar to proteins of the retinol‐binding protein superfamily. Some regions of the sequence are most similar to the retinol‐binding protein, β ‐lactoglobulin subgroup, while the disulphide bonding pattern is more akin to that seen in the porphyrin binding proteins insecticyanin and bilin‐binding protein. It is beginning to appear as though this superfamily of proteins, characterized by a similar gross structural framework, may be further subdivided into interrelated subclasses. Model building based on the coordinates of the known structure of human plasma retinol‐binding protein and on empirical prediction algorithms has allowed the putative identification of side‐chains which line the binding cavity. This pocket is larger than in retinol binding protein and β ‐lactoglobulin but does not allow the carotenoid to adopt a folded conformation. The amino acid composition of the pocket does not support a ‘charge‐shift’‐type hypothesis to support the bathochromic shift phenomenon which takes place on interaction of the chromophore with the protein. Instead aromatic side‐chains may play a prominent role. Article in Journal/Newspaper Homarus gammarus Wiley Online Library European Journal of Biochemistry 197 2 407 417 |
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Open Polar |
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Wiley Online Library |
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crwiley |
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English |
description |
The complete sequence has been determined for the A 2 subunit of crustacyanin, an astaxanthin‐binding protein from the carapace of the lobster Homarus gammarus . The polypeptide chain is 174 residues long and is similar to proteins of the retinol‐binding protein superfamily. Some regions of the sequence are most similar to the retinol‐binding protein, β ‐lactoglobulin subgroup, while the disulphide bonding pattern is more akin to that seen in the porphyrin binding proteins insecticyanin and bilin‐binding protein. It is beginning to appear as though this superfamily of proteins, characterized by a similar gross structural framework, may be further subdivided into interrelated subclasses. Model building based on the coordinates of the known structure of human plasma retinol‐binding protein and on empirical prediction algorithms has allowed the putative identification of side‐chains which line the binding cavity. This pocket is larger than in retinol binding protein and β ‐lactoglobulin but does not allow the carotenoid to adopt a folded conformation. The amino acid composition of the pocket does not support a ‘charge‐shift’‐type hypothesis to support the bathochromic shift phenomenon which takes place on interaction of the chromophore with the protein. Instead aromatic side‐chains may play a prominent role. |
format |
Article in Journal/Newspaper |
author |
KEEN, Jeffrey N. CACERES, Isabel ELIOPOULOS, Elias E. ZAGALSKY, Peter F. FINDLAY, John B.C. |
spellingShingle |
KEEN, Jeffrey N. CACERES, Isabel ELIOPOULOS, Elias E. ZAGALSKY, Peter F. FINDLAY, John B.C. Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin |
author_facet |
KEEN, Jeffrey N. CACERES, Isabel ELIOPOULOS, Elias E. ZAGALSKY, Peter F. FINDLAY, John B.C. |
author_sort |
KEEN, Jeffrey N. |
title |
Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin |
title_short |
Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin |
title_full |
Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin |
title_fullStr |
Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin |
title_full_unstemmed |
Complete sequence and model for the A 2 subunit of the carotenoid pigment complex, crustacyanin |
title_sort |
complete sequence and model for the a 2 subunit of the carotenoid pigment complex, crustacyanin |
publisher |
Wiley |
publishDate |
1991 |
url |
http://dx.doi.org/10.1111/j.1432-1033.1991.tb15925.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1432-1033.1991.tb15925.x https://febs.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1432-1033.1991.tb15925.x |
genre |
Homarus gammarus |
genre_facet |
Homarus gammarus |
op_source |
European Journal of Biochemistry volume 197, issue 2, page 407-417 ISSN 0014-2956 1432-1033 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1432-1033.1991.tb15925.x |
container_title |
European Journal of Biochemistry |
container_volume |
197 |
container_issue |
2 |
container_start_page |
407 |
op_container_end_page |
417 |
_version_ |
1811639358729486336 |