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Mucin CYS domains are ancient and highly conserved modules that evolved in concert.

Abstract：

BACKGROUND:Many large secreted gel-forming mucins contain multiple copies of a "naked" cysteine-enriched domain (CYS domain) that interrupt or are adjacent to mucin domains (Ser/Thr/Pro regions). There is less similarity of homologous CYS sequences between species than there is across CYS repeats within species. These CYS domains are likely implicated in reversible mucin-mucin interactions that play a central role in mucus properties. RESULTS:The use of multiple genome sequences in a comparative analysis of CYS sequences identified new mucins containing the CYS domain in various species. Furthermore, analysis showed that this domain is at least 650 million-year old and that CYS sequences evolved under strong selective pressure in concerted fashion in all species examined by two mechanisms that never coexist within a given gene: either multiplication of exons encoding CYS modules or successive intra-exonic duplications. CONCLUSION:The CYS sequences appear to have undergone concerted evolution with a high selective pressure to conserve cysteine and other amino acid residues. This domain is the best-conserved domain in secreted mucins pointing toward an important common function in many different organisms.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Desseyn JL

doi

10.1016/j.ympev.2009.03.035

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

284-92

issue

2

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(09)00123-7

journal_volume

52

pub_type

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