The in vivo TRPV6 protein starts at a non-AUG triplet, decoded as methionine, upstream of canonical initiation at AUG.

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Citation

Fecher-Trost C, Wissenbach U, Beck A, Schalkowsky P, Stoerger C, Doerr J, Dembek A, Simon-Thomas M, Weber A, Wollenberg P, Ruppert T, Middendorff R, Maurer HH, Flockerzi V

The in vivo TRPV6 protein starts at a non-AUG triplet, decoded as methionine, upstream of canonical initiation at AUG.

J Biol Chem. 2013 Jun 7;288(23):16629-44. doi: 10.1074/jbc.M113.469726. Epub 2013 Apr 23.

PubMed ID
23612980 [ View in PubMed
]
Abstract

TRPV6 channels function as epithelial Ca(2+) entry pathways in the epididymis, prostate, and placenta. However, the identity of the endogenous TRPV6 protein relies on predicted gene coding regions and is only known to a certain level of approximation. We show that in vivo the TRPV6 protein has an extended N terminus. Translation initiates at a non-AUG codon, at ACG, which is decoded by methionine and which is upstream of the annotated AUG, which is not used for initiation. The in vitro properties of channels formed by the extended full-length TRPV6 proteins and the so-far annotated and smaller TRPV6 are similar, but the extended N terminus increases trafficking to the plasma membrane and represents an additional scaffold for channel assembly. The increased translation of the smaller TRPV6 cDNA version may overestimate the in vivo situation where translation efficiency may represent an additional mechanism to tightly control the TRPV6-mediated Ca(2+) entry to prevent deleterious Ca(2+) overload.

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Polypeptides
NameUniProt ID
Transient receptor potential cation channel subfamily V member 6Q9H1D0Details