LIP1, a cytoplasmic protein functionally linked to the Peutz-Jeghers syndrome kinase LKB1.

Abstract:

:LKB1 is a serine/threonine kinase which is inactivated by mutation in the Peutz-Jeghers polyposis and cancer predisposition syndrome (PJS). We have identified a novel leucine-rich repeat containing protein, LIP1, that interacts with LKB1. The LIP1 gene consists of 25 exons, maps to human chromosome 2q36 and encodes a protein of 121 kDa. LIP1 appears to be a cytoplasmically located protein whereas we and others have shown previously that LKB1 is predominantly nuclear, with only a small proportion of cells showing strong cytoplasmic expression. However, when LKB1 and LIP1 are co-expressed, the proportion of cytoplasmic LKB1 dramatically increases, suggesting that LIP1 may regulate LKB1 function by controlling its subcellular localization. Ectopic expression of both LKB1 and LIP1 in Xenopus embryos induces a secondary body axis, providing further evidence for a functional link between the two proteins. This phenotype resembles the effects of ectopic expression of TGFbeta superfamily members and their downstream effectors. A possible role for LIP1 and LKB1 in TGFbeta signalling is supported by the observation that LIP1 interacts with the TGFbeta-regulated transcription factor SMAD4, forming a LKB1-LIP1-SMAD4 ternary complex. SMAD4 mutations give rise to juvenile polyposis syndrome, which is clinically similar to PJS. Our data suggest an unsuspected mechanistic link between these two syndromes.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Smith DP,Rayter SI,Niederlander C,Spicer J,Jones CM,Ashworth A

doi

10.1093/hmg/10.25.2869

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

2869-77

issue

25

eissn

0964-6906

issn

1460-2083

journal_volume

10

pub_type

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