Proteomic analysis of the cell-surface membrane in chronic lymphocytic leukemia: identification of two novel proteins, BCNP1 and MIG2B.

Abstract:

:B-cell-specific plasma-membrane proteins are potential targets for either small molecule or antibody-based therapies. We have sought to annotate proteins expressed at the cell surface membrane in patients with chronic lymphocytic leukemia (CLL) using plasma-membrane-based proteomic analysis to identify previously uncharacterized and potentially B-cell-specific proteins. Proteins from plasma-membrane fractions were separated on one-dimensional gels and trypsinized fractions subjected to high-throughput MALDI-TOF mass spectrometry. Using this method, many known B-cell surface antigens were detected, but also known proteins not previously described in this disease or in this cellular compartment, including cell surface receptors, membrane-associated enzymes and secreted proteins, and completely unknown proteins. To validate the method, we show that BLK, a B-cell-specific kinase, is located in the CLL-plasma-membrane fraction. We also describe two novel proteins (MIG2B and B-cell novel protein #1, BCNP1), which are expressed preferentially in B cells. MIG2B is in a highly conserved and defined gene family containing two plasma-membrane-binding ezrin/radixin/moesin domains and a pleckstrin homology domain; the Caenorhabditis elegans homolog (UNC-112) is a membrane-associated protein that colocalizes with integrin at cell-matrix adhesion complexes. BCNP1 is a completely unknown protein with three predicted transmembrane domains, with three alternatively spliced final exons. Proteomic analysis may thus define new potential therapeutic targets.

journal_name

Leukemia

journal_title

Leukemia

authors

Boyd RS,Adam PJ,Patel S,Loader JA,Berry J,Redpath NT,Poyser HR,Fletcher GC,Burgess NA,Stamps AC,Hudson L,Smith P,Griffiths M,Willis TG,Karran EL,Oscier DG,Catovsky D,Terrett JA,Dyer MJ

doi

10.1038/sj.leu.2402993

subject

Has Abstract

pub_date

2003-08-01 00:00:00

pages

1605-12

issue

8

eissn

0887-6924

issn

1476-5551

pii

2402993

journal_volume

17

pub_type

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