Volume 74, Issue 2, Pages (February 1998)

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Volume 74, Issue 2, Pages 953-963 (February 1998) Transglutaminase-Induced Cross-Linking between Subdomain 2 of G-Actin and the 636–642 Lysine-Rich Loop of Myosin Subfragment 1  Luba Eligula, Li Chuang, Martin L. Phillips, Masao Motoki, Katsuya Seguro, Andras Muhlrad  Biophysical Journal  Volume 74, Issue 2, Pages 953-963 (February 1998) DOI: 10.1016/S0006-3495(98)74018-4 Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 1 Time course of cross-linking 8μM CaATP-G-actin to 8μM IAEDANS-labeled S1(A2) at 25 and at 0°C. (A) Coomassie Blue-stained gel; (B) fluorescent gel. Vertical symbols: X, 180-kDa actin-S1 cross-linked product; HC, S1 heavy chain; AC, actin. Lane 1, S1(A2) plus actin; lanes 2–5, S1(A2) and actin treated with 0.2 unit/ml transglutaminase for 5, 15, 30, and 60min at 0°C; lanes 6–9, actin and S1(A2) treated with 0.2unit/ml transglutaminase for 5, 15, 30, and 60min at 25°C; lane 10, S1(A2). Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 2 Cross-linking of 8μM IAEDANS-labeled CaATP-G-actin to 8μM S1(A2). (A) Fluorescent gel; (B) Coomassie Blue-stained gel. Vertical symbols as in Fig. 1. Lanes 1 and 2, S1(A2) treated with 0.2 unit/ml transglutaminase for 30 and 15min; lanes 3–5, actin treated with 0.2 unit/ml transglutaminase for 30, 15, and 0min; lane 6, S1(A2); lanes 7–9, S1(A2) and actin treated with 0.2 unit/ml transglutaminase for 30, 15, and 0min as described in Materials and Methods. Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 3 Attempt to cross-link 8μM IAEDANS-labeled CaATP-G-actin to 8μM trypsin-digested S1. (A) Fluorescent gel; (B) Coomassie Blue-stained gel. Vertical symbols: 50-, 27-, and 20-kDa tryptic fragments of the S1 heavy chain, respectively; HC, S1 heavy chain; AC, actin. Lane 1, tryptic S1 and actin; lane 2, tryptic S1 and actin treated with 0.2 unit/ml transglutaminase for 30min; lane 3, tryptic S1; lanes4 and 5, tryptic S1 treated with 0.2 unit/ml transglutaminase for 15 and 30min; lane 6, actin; lane 7, undigested S1; lanes 8 and 9, actin treated with 0.2 unit/ml transglutaminase for 15 and 30min as described under Materials and Methods. Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 4 Cross-linking of 8μM Ca-ATP-G-actin to 8μM IAEDANS-labeled S1 digested by staphylococcus V8 protease. (A) Fluorescent gel; (B) Coomassie Blue-stained gel. Vertical symbols: 48-, 28-, and 22-kDa V8 fragments of the S1 heavy chain; (X) 68-kDa actin-22-kDa V8 S1 heavy chain fragment cross-linked product; (HC) S1 heavy chain; (AC) actin. Lane 1, S1; lane 2, V8-digested S1 plus actin; lane 3, V8-digested S1 and actin treated with 0.2 unit/ml transglutaminase for 30min; lanes 4 and 5, V8-digested S1 treated with 0.2 unit/ml transglutaminase in the absence of actin for 15 and 30min, respectively. The conditions for V8 digestion and cross-linking are described in Materials and Methods. Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 5 Tryptic digestion of V8-digested and IAEDANS-labeled S1 cross-linked to G-actin. IAEDANS-labeled S1 digested by V8 protease with 100:1 S1 to V8 w/w ratio at 22°C for 1h and immediately added to the cross-linking mixture containing G-actin and transglutaminase (final concentrations 8μM S1, 12μM G-actin, 0.1unit/ml transglutaminase). This mixture was incubated on ice for 1h and then digested in the presence of 6mM EDTA by trypsin at 50:1 S1 to trypsin w/w ratio at 22°C for 10min. Left panel, fluorescent gel; right panel, Coomassie Blue-stained gel. Vertical symbols: 70-, 48-, 28-, and 22-kDa V8 fragments and 20-kDa C-terminal tryptic fragment of the S1 heavy chain; X1, S1 heavy chain-actin cross-linked product; X2, 68-kDa actin-22-kDa V8 S1 heavy chain fragment cross-linked product (star); HC, S1 heavy chain; AC, actin. Lane 1, V8-digested S1; lane 2, actin and V8-digested S1 treated with transglutaminase; lane 3, tryptic digest of the transglutaminase treated actin and V8-digested S1. Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 6 Electron microscopic examination of cross-linked and polymerized acto-S1. G-actin (12μM) and S1 (8μM) in G-actin buffer were incubated with 0.1 unit/ml transglutaminase for 1h and polymerized with 2mM MgCl2. Samples were handled and examined as described in Materials and Methods. A, uncross-linked control; B, cross-linked sample. Arrows, S1 decoration of actin filaments. The bar in B represents 1000Å. Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 7 Effect of pH on the cross-linking between 8μM Ca-ATP-G-actin and 8μM IAEDANS-labeled S1. (A) Fluorescent gel; (B) Coomassie Blue-stained gel. Vertical symbols as in Fig. 1. Lanes 1–5, actin and S1 treated with 0.2 unit/ml transglutaminase at pH 6.7, 7.0, 7.3, 7.6, and 8.0, respectively; lane 6, S1 treated with 0.2 unit/ml transglutaminase at pH 7.6 as described in Materials and Methods; lane 7, S1; lane 8, actin. Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 8 Cross-linking of 8μM CaATP- or MgATP-G-actins to 8μM IAEDANS-labeled S1(A2). (A) Fluorescent gel; (B) Coomassie Blue-stained gel. Vertical symbols as in Fig. 1. Lane 1, CaATP-G-actin; lanes 2 and 3, CaATP-G-actin and S1(A2) treated with 0.2 unit/ml transglutaminase for 15 and 30min, respectively; lanes 4 and 5, MgATP-G-actin and S1 treated with 0.2 unit/ml transglutaminase for 30 and 15min, respectively, as described in Materials and Methods; lane 6, MgATP-G-actin; lane 7, S1(A2). Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions

Figure 9 Cross-linking of 8μM MgATP- or MgADP-G-actins to 8μM IAEDANS-labeled S1. Vertical symbols as in Fig. 1. (A) Fluorescent gel; (B) Coomassie Blue-stained gel. Lane 1, MgATP-G-actin; lane 2 and 3, MgATP-G-actin and S1 treated with transglutaminase for 15 and 30min, respectively; lane 4 and 5, MgADP-G-actin and S1 treated with transglutaminase for 15 and 30min, respectively, as described in Materials and Methods; lane 6, MgADP-G-actin; lane 7, S1. Biophysical Journal 1998 74, 953-963DOI: (10.1016/S0006-3495(98)74018-4) Copyright © 1998 The Biophysical Society Terms and Conditions