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Chain-Deficient Igm Structural and Functional Analysis of J Structural and Functional Analysis of J Chain-Deficient IgM Erik J. Wiersma, Cathy Collins, Shafie Fazel and Marc J. Shulman This information is current as J Immunol 1998; 160:5979-5989; ; of September 25, 2021. http://www.jimmunol.org/content/160/12/5979 References This article cites 44 articles, 19 of which you can access for free at: Downloaded from http://www.jimmunol.org/content/160/12/5979.full#ref-list-1 Why The JI? Submit online. http://www.jimmunol.org/ • Rapid Reviews! 30 days* from submission to initial decision • No Triage! Every submission reviewed by practicing scientists • Fast Publication! 4 weeks from acceptance to publication *average Subscription Information about subscribing to The Journal of Immunology is online at: by guest on September 25, 2021 http://jimmunol.org/subscription Permissions Submit copyright permission requests at: http://www.aai.org/About/Publications/JI/copyright.html Email Alerts Receive free email-alerts when new articles cite this article. Sign up at: http://jimmunol.org/alerts The Journal of Immunology is published twice each month by The American Association of Immunologists, Inc., 1451 Rockville Pike, Suite 650, Rockville, MD 20852 Copyright © 1998 by The American Association of Immunologists All rights reserved. Print ISSN: 0022-1767 Online ISSN: 1550-6606. Structural and Functional Analysis of J Chain-Deficient IgM1 Erik J. Wiersma, Cathy Collins, Shafie Fazel, and Marc J. Shulman2 Previous studies have discerned two forms of polymeric mouse IgM: moderately cytolytic (complement-activating) pentamer, which contains J chain, and highly cytolytic hexamer, which lacks J chain. To investigate the relationships among polymeric structure, J chain content, and cytolytic activity, we produced IgM in J chain-deficient and J chain-proficient mouse hybridoma cell lines. Both hexamer and pentamer were produced in the absence as well as the presence of J chain. Hexameric IgM activated (guinea pig) complement approximately 100-fold more efficiently than did J chain-deficient pentamer, which, in turn, was more active than J chain-containing pentamer. These results are consistent with the hypothesis that J chain-containing pentamer cannot activate complement. We also analyzed the structure of IgM-S337, in which the m-chain bears the C337S substitution. Like normal IgM, IgM-S337 was formed as a hexamer and as both J chain deficient- and J chain-containing pentamers. Unlike normal IgM, IgM-S337 dissociated in SDS into various subunits. For IgM-S337 pentamer, the predominant subunits migrated as m2k2 and m4k4, and the subunit distribution was unaltered by J chain. However, J chain was found only in the m2k2 species, suggesting that Downloaded from some arrangement of inter-m bonds directs incorporation of J chain. IgM-S337 hexamer also dissociated to m2k2 and m4k4, but also yielded several species migrating much more slowly in SDS-PAGE than wild-type m12k12. To account for these forms, we propose that each m-chain can interact with three other m-chains and that some hexameric molecules contain two catenated m6k6 circles. The Journal of Immunology, 1998, 160: 5979–5989. chain is a 15-kDa glycoprotein covalently associated by di- of J chain into pentamer might affect the disulfide bonding of IgM http://www.jimmunol.org/ sulfide bonds with polymeric forms of IgM and IgA (1, 2). and in this indirect way depress its cytolytic activity. Alternatively, J The Ig m heavy chain has three cysteine residues available the hexameric C1q complement component might interact better for intermolecular disulfide bonds. C337, C414, and C575 lie in with hexameric than with pentameric IgM. As well, IgM-bound J the Cm2, Cm3, and Cm4/tail domains, respectively, and are thought chain might sterically hinder the binding of C1q and thereby de- to join m-chains via homo-pairs (C337-C337, C414-C414, and crease the cytolytic activity of pentameric IgM. C575-C575) (3, 4). Each pentameric IgM molecule contains ap- To extend our understanding of the relationships among disul- proximately one J chain attached to the penultimate amino acid of fide bonding, cytolytic activity, and incorporation of J chain, we m the -chain, C575 (2, 5–8). J chain is disulfide bonded via its C14 have examined the structure and function of wild-type IgM pro- by guest on September 25, 2021 and C68 to no more than two m-chains (6, 9). Most or all incor- duced in cells expressing or not expressing J chain. We have sim- poration of J chain into IgM occurs relatively late in the intracel- ilarly examined IgM in which one or more m-chain cysteine res- lular assembly process, at a stage when IgM polymers have been idues have been replaced by serine. Our results indicate that formed but are not yet fully linked by disulfide bonds (5, 10). pentameric IgM is produced in the absence of J chain and that this Two functions have been described for Ig-associated J chain. J J2IgM, like J1IgM, is much less cytolytic than hexameric IgM. chain is necessary for binding of IgM and IgA to the poly-Ig re- We have not detected any difference in the inter-m-chain disulfide ceptor, which functions in epithelial transcytosis of Igs (11–13). bonding when comparing J1 and J2 pentameric IgM, but incor- Also, J chain modifies polymeric assembly of IgM, in that rela- poration of J chain appears to be restricted in some way by the tively more pentamer and less hexamer are produced in the pres- C414-C414 bond. Our analysis also suggests that each m-chain in ence of J chain. The fraction of IgM that was seen as pentamer in hexameric IgM might be bonded to three other m-chains rather the absence of J chain has varied among different studies, ranging than to only two m-chains as is conventionally depicted. from none up to 50% (14–16). Pentameric IgM differs from hex- americ IgM in several ways. First, J chain is found in pentameric, but not hexameric, IgM. Second, pentameric IgM is less cytolytic Materials and Methods than hexameric IgM (17, 18). Third, analysis of mutant IgM has Cell lines suggested that more inter-m-chain C414-C414 bonds are formed in Cell lines are based on the Sp6 hybridoma cell line, which secretes IgM hexameric IgM than in pentameric IgM (19, 20). These correla- specific for DNP and TNP3 (21). All J1 cell lines producing mutant IgM, tions could have multiple explanations. For example, incorporation except T/m-S414(0), were obtained by transfecting m gene constructs into the X10 cell line, which expresses the k-chain but not the m-chain (22). The transfectoma, T/m-S414(0), which produces IgM-S414 in the absence of J Departments of Immunology and Molecular and Medical Genetics, University of chain, has been previously described (20). We have used two Sp6-derived Toronto, Toronto, Ontario, Canada mutant cell lines, igm482 and igm43, for size markers and other controls. m Received for publication November 3, 1997. Accepted for publication February The cell line igm482 secretes IgM monomer lacking the C 4 domain (23), 19, 1998. and igm43 secretes polymer lacking the Cm1 domain from which the k light chain dissociates in SDS (21). IgME10 is derived from the myeloma The costs of publication of this article were defrayed in part by the payment of page MOPC-315 and produces IgM bearing l-chain (24). charges. This article must therefore be hereby marked advertisement in accordance with 18 U.S.C. Section 1734 solely to indicate this fact. 1 This work was supported by the Medical Research Council of Canada. 2 Address correspondence to Dr. Marc J. Shulman, Department of Immunology, Uni- 3 Abbreviations used in this paper: TNP, 2,4,6-trinitrophenyl; AU-PAGE, alkaline versity of Toronto, Medical Sciences Building, Toronto, Ontario, Canada M5S 1A8. urea-polyacrylamide gel electrophoresis; SDG, sucrose density gradient; wt, wild E-mail: [email protected] type. Copyright © 1998 by The American Association of Immunologists 0022-1767/98/$02.00 5980 ANALYSIS OF J CHAIN-DEFICIENT IgM Protein analysis Biosynthetic labeling of cells was performed as described previously (4), except that [35S]methionine (SJ.204, Amersham, Arlington Heights, IL) was used at a concentration of 50 to 100 mCi/ml for labeling. 35S-labeled or unlabeled IgM was prepared from supernatants either by affinity purification using DNP-Sepharose (17) or by immunoprecipitation using anti-IgM Abs and protein G-agarose (4). IgM was fractionated by sucrose density gradient centrifugation at 23,000 rpm for 16.75 h in an SW41 rotor as previously described (17). Nonreduced IgM was fractionated by SDS-PAGE using a modification of Laemmli’s method (4, 25). To obtain optimal resolution of various IgM species, the concentrations of acrylamide and agarose were varied, as in- dicated in the figure legends. The sample buffer for SDS-PAGE sometimes contained 25 mM iodoacetic acid to prevent spontaneous reduction, but its inclusion was found not to affect the result. Prestained molecular mass markers (Life Technologies, Grand Island, NY; 14–228 kDa) were in- cluded in most experiments. Separated proteins were visualized either by autoradiography and PhosphorImager analysis (Molecular Dynamics, Sunnyvale, CA) or using a Western blot procedure (see below). Radiolabeled J chain was assayed by AU-PAGE (26). To assess indi- vidual IgM species, bands were excised from the SDS-PAGE gel, ex- tracted, and then analyzed by AU-PAGE (27). After extraction, IgM was Downloaded from reduced by 50 mM DTT in 0.1 M Tris (pH 8.0), alkylated with an equal volume of 0.5 M iodoacetic acid in 1.5 M Tris-HCl (pH 8.8), and precip- itated with 10 vol of acetone at 220°C.
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