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Segment-Long-Spacing (SLS) and the Polymorphic Structures of Fibrillar Collagen

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Macromolecular Protein Complexes IV

Part of the book series: Subcellular Biochemistry ((SCBI,volume 99))

Abstract

The diverse and complex functions of collagen during the development of an organism are closely related to the polymorphism of its supramolecular structures in the extracellular matrix. SLS (segment-long-spacing) is one of the best understood alternative structures of collagen. SLS played an instrumental role in the original studies of collagen more than half a century ago that laid the foundation of nearly everything we know about collagen today. Despite being used mostly under in vitro conditions, the natural occurrence of SLS in tissues has also been reported. Here we will provide a brief overview of the major findings of the SLS and other structures of collagen based on a wealth of work published starting from the 1940s. We will discuss the factors that determine the stability and the structural specificity of the different molecular assemblies of collagen in light of the new studies using designed fibril forming collagen peptides. At the end of the chapter, we will summarize some recent discoveries of the alternative structures of collagen in tissues, especially those involved in pathogenic states. A revisit of SLS will likely inspire new understandings concerning the range of critical roles of fibrillar collagen in terms of its organizational diversity in the extracellular matrix.

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Notes

  1. 1.

    There had been active debate on the actual size of the D-period, the value varied from 64 nm to 70 nm. For clarity, we will use the currently accepted value of 67 nm to describe the findings including those published before the size of the D-period was finalized, unless specifically noted.

  2. 2.

    It was later reported that TEM stain uranyl acetate may also stain positively charged residues (Tzaphlidou et al. 1982a, b).

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Correspondence to Yujia Xu .

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Xu, Y., Kirchner, M. (2022). Segment-Long-Spacing (SLS) and the Polymorphic Structures of Fibrillar Collagen. In: Harris, J.R., Marles-Wright, J. (eds) Macromolecular Protein Complexes IV. Subcellular Biochemistry, vol 99. Springer, Cham. https://doi.org/10.1007/978-3-031-00793-4_16

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