Structural features of Ly-5 glycoproteins of the mouse and counterparts in other mammals.

Abstract:

:The Ly-5 system of the mouse defines a set of transmembrane glycoprotein isoforms (T200, B220, etc) that hallmark various lineages and stages of hematopoietic differentiation. These isoforms are the products of a single Ly-5 gene comprising 34 exons, 32 of them (Exs-3-34) protein-coding and three (Exs-5-7) selectively represented in different isoforms (e.g., all three in isoform B220 but none in isoform T200). Probable structural features of Ly-5 glycoproteins, largely inferred from Ly-5 gene composition, are presented and compared with the rat L-CA and human LCA/T200 systems, which are phylogenetic counterparts of Ly-5 as an index of the extent and nature of structural conservation. The outer (N-terminal) region of the Ly-5 T200 isoform comprises three broadly similar domains (Exs-4, 8, 9) with salient features that jointly favor free interaction with the aqueous environment and are shared by the L-CA and human LCA/T200 systems despite an overall interspecies protein sequence similarity in this region of only about 50%. In the larger B220 isoform this region includes epitopes dictated by the selective exons Exs-5, 6, 7, these being more conserved than the shared exons Exs-4, 8, 9 and no doubt sustaining the differential functions of the respective isoforms. Comparison of the genomic sequences of Ex-5 in the Ly-5 and human systems suggests that a shift in splice donor site accounts for an extra 23 amino acids in the human Ex-5-coding domain, which is the only salient structural difference between the mouse Ly-5 and human systems. The inner extracellular region (Exs-10-16) includes subregions of high variability, but again there are shared salient interspecies similarities such as sites and numbers of Cys residues that imply a conserved, tightly-folded conformation, in contrast to the more open conformation predicted for the outer extracellular region. The transmembrane region (Ex-17) is highly conserved, as is the very large cytoplasmic region (Exs-17-34) which may interact with the plasma membrane but probably does not traverse it.

journal_name

Immunogenetics

journal_title

Immunogenetics

authors

Tung JS,Saga Y,Boyse EA

doi

10.1007/BF00345505

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

271-7

issue

4

eissn

0093-7711

issn

1432-1211

journal_volume

28

pub_type

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