학술논문
Experimental phasing opportunities for macromolecular crystallography at very long wavelengths
Document Type
article
Author
Kamel El Omari; Ramona Duman; Vitaliy Mykhaylyk; Christian M. Orr; Merlyn Latimer-Smith; Graeme Winter; Vinay Grama; Feng Qu; Kiran Bountra; Hok Sau Kwong; Maria Romano; Rosana I. Reis; Lutz Vogeley; Luca Vecchia; C. David Owen; Sina Wittmann; Max Renner; Miki Senda; Naohiro Matsugaki; Yoshiaki Kawano; Thomas A. Bowden; Isabel Moraes; Jonathan M. Grimes; Erika J. Mancini; Martin A. Walsh; Cristiane R. Guzzo; Raymond J. Owens; E. Yvonne Jones; David G. Brown; Dave I. Stuart; Konstantinos Beis; Armin Wagner
Source
Communications Chemistry, Vol 6, Iss 1, Pp 1-11 (2023)
Subject
Language
English
ISSN
2399-3669
Abstract
Abstract Despite recent advances in cryo-electron microscopy and artificial intelligence-based model predictions, a significant fraction of structure determinations by macromolecular crystallography still requires experimental phasing, usually by means of single-wavelength anomalous diffraction (SAD) techniques. Most synchrotron beamlines provide highly brilliant beams of X-rays of between 0.7 and 2 Å wavelength. Use of longer wavelengths to access the absorption edges of biologically important lighter atoms such as calcium, potassium, chlorine, sulfur and phosphorus for native-SAD phasing is attractive but technically highly challenging. The long-wavelength beamline I23 at Diamond Light Source overcomes these limitations and extends the accessible wavelength range to λ = 5.9 Å. Here we report 22 macromolecular structures solved in this extended wavelength range, using anomalous scattering from a range of elements which demonstrate the routine feasibility of lighter atom phasing. We suggest that, in light of its advantages, long-wavelength crystallography is a compelling option for experimental phasing.