Calcium-Binding Protein Protocols Calcium-Binding Protein Protocols

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FTIR Spectroscopy of Calcium-Binding Proteins 57 5 Fourier Transform Infrared Spectroscopy of Calcium-Binding Proteins Heinz Fabian and Hans J. Vogel 1. Introduction Infrared spectroscopy measures absorptions of vibrating molecules and yields information about molecular structure and structural interactions. Over the last two decades, the infrared technique has emerged as a very useful tool for examining protein conformation as a result of the increase in energy throughput, achievable signal-to-noise ratio, wavenumber accuracy, and data aquisition rates that came with the development of Fourier transform infrared (FTIR) spectrometers. High-quality infrared spectra can now rapidly be aquired and require only relatively small amounts of protein. The size of the protein or the nature of the environment does not limit the application of FTIR spectroscopy. Importantly, measurements of proteins in aqueous solution are almost routine now. Furthermore, the process of obtaining structural information is not restricted to a static picture, but can also be achieved in real time by applying time-resolved infrared techniques. The effects of environmental factors, point mutations, or ligand binding on the structure of the proteins can be examined with high sensitivity by using peptide backbone and side-chain infrared bands as conformation-sensitive monitors. In combination with isotope labeling, the technique also permits the study of protein–protein or protein–peptide interactions. 2. Materials 2.1. FTIR Spectrometer Spectrometers required for measuring high-quality spectra of proteins in the midinfrared region are available from a variety of manufacturers. These research-grade instruments offer a spectral resolution of better than 1 cm –1 and From: Methods in Molecular Biology, vol. 173: Calcium-Binding Protein Protocols, Vol. 2: Methods and Techniques Edited by: H. J. Vogel © Humana Press Inc., Totowa, NJ 57
58 Fabian and Vogel are equipped with sensitive infrared detectors. The most common detectors are triglycine sulfate (TGS), deuterated triglycine sulfate (DTGS), and liquidnitrogen cooled mercury-cadmium telluride (MCT). MCT detectors are more sensitive and permit much higher aquistion rates than TGS and DTGS detectors. Nevertheless, MCT detectors are not always the best choice because they suffer from problems associated with detector nonlinearity at high absorbance values. The limited linear range may be a disadvantage when studying proteins dissolved in water because of the high absorptivity of water bands in certain regions. TGS and DTGS detectors work at room temperature and have the advantage of a significantly extended detector linearity. Although the latter detectors require longer aquisition times, they are a good choice for many experiments under equilibrium conditions. Some research-grade FTIR spectrometers are able to accomodate two detectors and allow for rapid computercontrolled exchange between these detectors (see Note 1). 2.2. Sampling Devices and Sample Handling The majority of FTIR experiments with calcium-binding proteins have been carried out in aqueous solution and were conducted with conventional transmission geometries. Here, the nature of the material of which the cell window is constructed and the pathlength of the cell are important. 2.2.1. Window Materials Among the IR window materials available for experiments in aqueous solution, calcium fluoride (CaF 2) is the most common because (1) it has a low refractive index, which is similar to that of water; (2) it is relatively rugged; and (3) is transparent from the midinfrared (>1000 cm –1 ) to the ultraviolet (UV) region of the spectrum. Barium fluoride (BaF 2), a similar window material, has a lower spectral cutoff than CaF 2 (800 cm –1 ), but it is significantly more soluble in aqueous solution. Although CaF 2 is the most suitable window material for protein measurements, it is not an ideal window material for long-term measurements of Ca 2+ -binding proteins. The solubility of CaF 2 in water is very low, but a possible contamination of the sample by dissolution of Ca 2+ from the CaF 2 window cannot be excluded. Consequenctly, the Ca 2+ -free form of a sample may not persist during the collection of spectra over longer time scales. Window materials that are insoluble in water (such as KRS-5, ZnSe, or Irtran) are available, but are characterized by an unfortunate high refractive index, which results in major reflection losses and persistent fringing in the spectra (see Note 2). 2.2.2. Path Length of the Cell The choice of the path length of the IR cell depends upon which region of the spectrum is of interest. The most useful probe of protein secondary struc-
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Methods in Molecular BiologyTM Biol
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M E T H O D S I N M O L E C U L A R
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© 2002 Humana Press Inc. 999 River
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Preface Calcium plays an important
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Contents Dedication ...............
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Contents xi 26 Enzymatic Assays to
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xiv Contents of Companion Volume 15
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xvi Contributors LESLIE D. HICKS
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20 Dean, Kelsey, and Re
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2 Yazawa
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4 Yazawa Fig. 1. Schematic represen
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Page 27 and 28: 8 Yazawa DuPont-NEN and the molar c
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Page 33 and 34: 14 Yazawa 12. Starovasnik, M. A., D
Page 35 and 36: 16 Fig. 1. Molecular structures and
Page 37 and 38: 18 Linse 7. 0.1 M EDTA. Dissolve 37
Page 39 and 40: 20 Linse iterate the other paramete
Page 41 and 42: 22 Linse tive to small alterations
Page 43 and 44: 24 Linse References 1. Tsien, R. Y.
Page 45 and 46: 26 Haiech and Kilhoffer to use the
Page 47 and 48: 28 Haiech and Kilhoffer where γ is
Page 49 and 50: 30 Haiech and Kilhoffer reporter gr
Page 51 and 52: 32 Haiech and Kilhoffer tein with i
Page 53 and 54: 34 Haiech and Kilhoffer Calmodulin
Page 55 and 56: 36 Haiech and Kilhoffer Fig. 3. Mec
Page 57 and 58: 38 Haiech and Kilhoffer We may sugg
Page 59 and 60: 40 Haiech and Kilhoffer 29. Stewart
Page 61 and 62: 42 Haiech and Kilhoffer 62. Becking
Page 63 and 64: 44 Martin and Bayley Fig. 1. Absorp
Page 65 and 66: 46 Martin and Bayley evaporation. C
Page 67 and 68: 48 Martin and Bayley 4. Set the tem
Page 69 and 70: 50 Martin and Bayley Fig. 2. Near-U
Page 71 and 72: 52 Martin and Bayley discussed by M
Page 73 and 74: 54 Martin and Bayley References 1.
Page 75: 20 Dean, Kelsey, and Reik
Page 79 and 80: 60 Fabian and Vogel The penetration
Page 81 and 82: 62 Fabian and Vogel perature, ionic
Page 83 and 84: 64 Fabian and Vogel Fig. 3. IR spec
Page 85 and 86: 66 Fabian and Vogel Fig. 4. Lower t
Page 87 and 88: 68 Fabian and Vogel These correlati
Page 89 and 90: 70 Fabian and Vogel Fig. 5. Amide I
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Page 93 and 94: 74 Fabian and Vogel 25. Georg, H.,
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Page 103 and 104: 84 Table 1 Advanced Fluorescence Me
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Page 109 and 110: 90 Johnson and Tikunova is removed
Page 111 and 112: 92 Johnson and Tikunova function of
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Page 115 and 116: 96 Johnson and Tikunova Fig. 3. Rat
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Page 119 and 120: 100 Johnson and Tikunova cence inte
Page 121 and 122: 102 Johnson and Tikunova 6. Johnson
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108 Julenius Fig. 3. A typical sens
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110 Julenius (2), is used in the Ia
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20 Dean, Kelsey, and Reik
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114 Lopez and Makhatadze Fig. 1. Th
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116 Lopez and Makhatadze 6. Buffers
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118 Lopez and Makhatadze The excess
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122 Lopez and Makhatadze Fig. 1. Is
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124 Lopez and Makhatadze 2.5 mL are
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126 Lopez and Makhatadze pendence o
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128 Hicks et al. equipped with a pu
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130 Hicks et al. Fig. 2. Debye plot
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132 Hicks et al. and 1.0 mg/mL for
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134 Hicks et al. Fig. 3. Sedimentat
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136 Hicks et al. 5. Hayes, D. B. (M
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138 Trewhella and Krueger This chap
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140 Trewhella and Krueger of the sc
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142 Trewhella and Krueger Table 1 C
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144 Trewhella and Krueger beam, or
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146 Trewhella and Krueger At very l
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148 Trewhella and Krueger analytica
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150 Trewhella and Krueger collapsed
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152 Trewhella and Krueger P(r) func
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154 Trewhella and Krueger Fig. 3. S
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156 Trewhella and Krueger concentra
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158 Trewhella and Krueger by a Nati
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162 Doherty-Kirby and Lajoie metal
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164 Doherty-Kirby and Lajoie two Ca
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166 Doherty-Kirby and Lajoie 7. Pep
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168 Doherty-Kirby and Lajoie Fig. 1
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170 Doherty-Kirby and Lajoie Fig. 2
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172 Doherty-Kirby and Lajoie 5. Alt
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174 Doherty-Kirby and Lajoie phosph
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176 Shaw Fig. 1. Ribbon drawing of
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178 Shaw 2.3. Other 1. Chemicals fo
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180 Shaw 3.3.3. Purification 1. Con
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182 Shaw 10. Hodges, R. S., Semchuk
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184 Brokx and Vogel Table 1 An Over
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186 Brokx and Vogel Fig. 1. UV abso
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188 Brokx and Vogel Fig. 2. 20% SDS
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190 Brokx and Vogel it through an a
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192 Brokx and Vogel 8. Weljie, A. M
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196 Berliner Fig. 1. Aqueous X-band
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198 Berliner in the Bruker instrume
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200 Berliner Fig. 3. ESR spectra of
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202 Berliner Fig. 5. Low-temperatur
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204 Berliner 14. Musci, G., Reed, G
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206 Clarke and Vogel cal calcium-bi
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208 Clarke and Vogel Fig. 1. 113 Cd
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214 Clarke and Vogel The linewidth
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218 Drakenberg sands, of Hertz broa
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220 Drakenberg 1. Bloch equations m
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222 Drakenberg Fig. 2. Measurement
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224 Drakenberg Fig. 3. (A) 43 Ca NM
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226 Drakenberg Fig. 5. 43 Ca NMR sp
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228 Drakenberg NMR at sub-mM concen
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230 Drakenberg 30. Shimizu, T., Hat
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232 Weljie and Heringa Table 1 Amin
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234 Weljie and Heringa Table 2 Webs
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236 Weljie and Heringa diction meth
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238 Weljie and Heringa these databa
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240 Weljie and Heringa lineages. Th
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242 Weljie and Heringa compared, an
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244 Weljie and Heringa sequences as
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246 Weljie and Heringa much larger
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248 Weljie and Heringa ment require
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250 Weljie and Heringa 10. Kawasaki
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252 Weljie and Heringa 44. Thompson
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254 Weljie and Heringa
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256 Li et al. In order for these ex
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258 Li et al. 7. Mineral Mixture (s
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260 Li et al. 3. When the 45% D 2O/
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262 Li et al. sion system works eff
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264 Li et al. reliably produce high
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268 Mal et al. NMR data, X-PLOR (11
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270 Mal et al. Table 1 Simulated An
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272 Mal et al. 3.1.2.1. AMBIGUOUS D
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274 Mal et al. molecular dynamics a
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276 Mal et al. Assuming a rigid bod
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278 Mal et al. assign (segid A and
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280 Mal et al. References 1. Drenth
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282 Mal et al. 33. Jeener, J., Meie
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286 Werner et al. Our research has
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288 Fig. 1. (A) T 1, T 2 and the he
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290 Werner et al. tion, using gradi
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292 Werner et al. Fig. 3. (A) Rotat
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294 Werner et al. Fig. 4. (A) Line-
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296 Werner et al. Table 2 Models of
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298 Werner et al. 9. Reinhardt, D.
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300 Werner et al. 39. Press, W. H.,
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302 Boyd et al. utilize residual di
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304 Boyd et al. Fig. 1. (A) The sol
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306 Boyd et al. or significant peak
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308 Boyd et al. Fig. 3. Histogram o
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310 Boyd et al. total and NOE energ
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312 Boyd et al. 2. When studying mu
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314 Boyd et al. 4. Downing, A. K.,
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316 Boyd et al. 35. Schulte-Herbrug
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318 Yap et al. image representation
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320 Yap et al. modified EF-hand is
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322 Table 1 Angle and Distance Outp
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324 Yap et al. 2. Ikura, M. (1995)
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326 Kobayashi that S-100A1 and S-10
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328 Kobayashi 3.2. Coupling of Crom
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330 Kobayashi Fig. 2. Tricine/SDS/P
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332 Kobayashi 0.1% TFA at a flow ra
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334 Kobayashi Both recombinant S-10
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336 Kobayashi Fig. 6. Affinity chro
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340 Walsh et al. verts CaM from an
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342 Walsh et al. 11. Bovine serum a
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344 Walsh et al. Fig. 1. CaM-depend
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348 Walsh et al. 3.5. NOS Reduction
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354 Walsh et al. 3. Cho, M. J., Vag
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356 Hughes et al. The electroporati
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358 Hughes et al. 4. 1 M Na 2CO 3.
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360 Hughes et al. range, repeat ste
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362 Hughes et al. Table 1 Examples
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366 Persechini of the different CaM
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368 Persechini Fig. 1. Schematic re
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370 Persechini 2. 1 L of Terrific b
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372 Persechini Fig. 4. Titration wi
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374 Persechini Table 1 Parameters f
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376 Persechini Fig. 6. The [Ca 2+ -
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378 Persechini determined if the di
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380 Persechini relatively insensiti
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382 Persechini 18. Chafouleas, J. G
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384 Török et al. actions in the c
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386 Török et al. 3. The reaction
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388 Török et al. Fig. 2. Electros
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390 Török et al. Fig. 3. Peptides
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392 Török et al. Table 1 Peptide
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394 Török et al. Fig. 7. Nanospra
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396 Török et al. Fig. 9. Nanospra
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398 Török et al. Fig. 11. Electro
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400 Török et al. 3 µM FL-calmodu
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402 Török et al. Fig. 14. Localiz
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404 Török et al. Fig. 16. Indicat
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406 Török et al. the significantl
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408 Török et al.
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410 Index substitutes, see Fluoresc
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412 Index Stern-Volmer plot, 78, 81
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414 Index Phenothiazines, see Calmo
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METHODS IN MOLECULAR BIOLOGY TM •
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